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BEGIN:VEVENT
SUMMARY:QCD software and algorithms for the exascale
DTSTART:20230216T020000Z
DTEND:20230216T024500Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20306@indico2.riken.jp
DESCRIPTION:Speakers: Peter Boyle (University of Edinburgh)\n\nI will give
an overview of the development directions of Grid on current and future U
S exascale computers.\nI will also give an overview of the USQCD SciDAC-5
algorithm project to develop multiscale algorithms to exploit these.\n\nht
tps://indico2.riken.jp/event/4385/contributions/20306/
LOCATION:Seminar Room (1F)
URL:https://indico2.riken.jp/event/4385/contributions/20306/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor renormalization group approach to (1+1)-dimensional SU(2) p
rincipal chiral model at finite density
DTSTART:20230215T070800Z
DTEND:20230215T070900Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20410@indico2.riken.jp
DESCRIPTION:Speakers: Yoshinobu Kuramashi (Center for Computational Scienc
es\, University of Tsukuba)\, XIAO LUO\n\nWe apply the tensor renormalizat
ion group method to the (1+1)-dimensional SU(2) principal chiral model at
finite chemical potential with the use of the Gauss-Legendre quadrature to
discretize the SU(2) Lie group. The internal energy at vanishing chemical
potential $µ = 0$ shows good consistency with the prediction of the stro
ng and weak coupling expansions. This indicates an effectiveness of the Ga
uss-Legendre quadrature for the partitioning of the SU(2) Lie group. In th
e finite density region with $µ\\neq0$ at the strong coupling we observe
the Silver-Blaze phenomenon for the number density.\n\nhttps://indico2.rik
en.jp/event/4385/contributions/20410/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20410/
END:VEVENT
BEGIN:VEVENT
SUMMARY:HPC simulation of quantum computer
DTSTART:20230216T043000Z
DTEND:20230216T051500Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20308@indico2.riken.jp
DESCRIPTION:Speakers: Nobuyasu Ito\, Naoki Yoshioka\n\nSimulation framewor
k named “braket” for quantum computer with qubits and gates circuit is
developed for massively-parallelized HPC systems using the state-vector m
ethod. On the “Fugaku” supercomputer\, simulation for 40 qubits circui
t is achieved using 1\,024 or less nodes\, and if its full nodes are avail
able\, we will reach 48 qubits with double precision and 51 qubits with by
te precision. Simulation time per gate is less than one second\, though it
takes more for circuits more than about 40 qubits. As an application\, qu
antum variational algorithm is tested for quantum Heisenberg chain with 40
spins\, which treats 41 40-qubits circuits and evaluations with system Ha
miltonian between the circuits and therefore quantum mechanical state with
totally 41 x 40 = 1640 qubits is simulated exactly up to numerical accura
cy.\n\nhttps://indico2.riken.jp/event/4385/contributions/20308/
LOCATION:Seminar Room (1F)
URL:https://indico2.riken.jp/event/4385/contributions/20308/
END:VEVENT
BEGIN:VEVENT
SUMMARY:What is chiral susceptibility probing?
DTSTART:20230216T010000Z
DTEND:20230216T013000Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20385@indico2.riken.jp
DESCRIPTION:Speakers: Hidenori Fukaya (Osaka University)\n\nIn the early d
ays of QCD\, the axial U(1) anomaly was considered to trigger the breaking
of the SU(2)_L x SU(2)_R symmetry through topological excitations of gluo
n fields. However\, it has been a challenge for lattice QCD to quantify th
e effect. In this work\, we simulate QCD at high temperatures with chiral
symmetric lattice Dirac operator. The exact chiral symmetry enables us to
separate the contribution from the axial U (1) breaking from others among
the susceptibilities in the scalar and pseudoscalar channels. Our result i
n two-flavor QCD indicates that the connected and disconnected chiral susc
eptibilities\, which is conventionally used as a probe for SU(2) _L x SU(2
)_R breaking\, are dominated by the axial U(1) anomaly at temperatures gr
eater than 165 MeV.\n\nhttps://indico2.riken.jp/event/4385/contributions/2
0385/
LOCATION:Seminar Room (1F)
URL:https://indico2.riken.jp/event/4385/contributions/20385/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gradient flow\, the renormalization group beta function and furthe
r applications
DTSTART:20230216T003000Z
DTEND:20230216T010000Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20386@indico2.riken.jp
DESCRIPTION:Speakers: Oliver Witzel (Siegen University)\n\nThe renormaliza
tion group (RG) $\\beta$ function describes the running of the renormalize
d coupling and connects the ultraviolet and infrared regimes of quantum fi
eld theories. Using different gradient flow schemes\, we define renormaliz
ed couplings and determine the RG $\\beta$ function using a more tradition
al step-scaling method as well as the concept of the continuous $\\beta$ f
unction which showcases a direct relation between gradient flow and RG flo
w. \n\nWe present results for SU(3) gauge systems with different number of
flavors in the fundamental representation and discuss advantageous of the
continuous $\\beta$ function. In addition we point our future application
s.\n\nhttps://indico2.riken.jp/event/4385/contributions/20386/
LOCATION:Seminar Room (1F)
URL:https://indico2.riken.jp/event/4385/contributions/20386/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sign problem and the Worldvolume Hybrid Monte Carlo method
DTSTART:20230216T054500Z
DTEND:20230216T063000Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20387@indico2.riken.jp
DESCRIPTION:Speakers: Masafumi Fukuma (Kyoto University)\n\nThe numerical
sign problem is one of the major obstacles to first-principles calculation
s in a variety of important systems. Typical examples include finite-densi
ty QCD\, some condensed matter systems such as strongly correlated electro
n systems and frustrated spin systems\, and real-time dynamics of quantum
fields. Until very recently\, individual methods were developed for each t
arget system\, but over the past decade there has been a movement to find
a versatile solution to the sign problem. In this talk\, I first explain t
he essence of the sign problem and outline some of the approaches proposed
in line with the movement. I then focus on methods based on the Lefschitz
thimble\, and argue that the "Worldvolume Hybrid Monte Carlo method" [Fuk
uma and Matsumoto\, arXiv:2012.08468] is a promising method due to its rel
iability and versatility.\n\nhttps://indico2.riken.jp/event/4385/contribut
ions/20387/
LOCATION:Seminar Room (1F)
URL:https://indico2.riken.jp/event/4385/contributions/20387/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stabilised Wilson Fermions in Action - An overview of recent devel
opments
DTSTART:20230217T023000Z
DTEND:20230217T031500Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20389@indico2.riken.jp
DESCRIPTION:Speakers: Anthony Francis (National Yang Ming Chiao Tung Unive
rsity)\n\nThe stabilised Wilson fermion (SWF) framework combines numerical
enhancements and a new discretisation scheme for Wilson-Clover fermions.
In this presentation I discuss the components of the framework and give an
overview of the status of the application of SWF in two cases: Traditiona
l lattice QCD simulations\, i.e. with spatial lengths less than 6 fm\, and
simulations with large spatial volumes\, so-called master-field simulatio
ns. \nThe former is being addressed by the newly formed open lattice initi
ative (OpenLat) and recent work shows some benefits for the SWF\, for exam
ple in terms of discretisation effects. The latter requires also a rethink
ing of measurement strategies aside of the generation of such large lattic
es. Both are challenging tasks and are built upon the concept of stochasti
c locality. I highlight some thoughts on how this can be exploited and sho
w recent numerical results.\n\nhttps://indico2.riken.jp/event/4385/contrib
utions/20389/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20389/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Velocity of Sound beyond the High-Density Relativistic Limit from
Lattice Simulation of Dense Two-Color QCD
DTSTART:20230217T003000Z
DTEND:20230217T011500Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20390@indico2.riken.jp
DESCRIPTION:Speakers: Etsuko Itou (iTHEMS\, RIKEN)\n\nWe obtain the equati
on of state (EoS) for two-color QCD at low temperature and high density fr
om the lattice Monte Carlo simulation. We find that the velocity of sound
exceeds the relativistic limit (cs2/c2=1/3) after the BEC-BCS crossover in
the superfluid phase. Such an excess of the sound velocity is previously
unknown from any lattice calculations for QCD-like theories. This finding
might have a possible relevance to the EoS of neutron star matter revealed
by recent measurements of neutron star masses and radii.\n\nhttps://indic
o2.riken.jp/event/4385/contributions/20390/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20390/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon structure from lattice QCD on (10 fm)$^4$ at the physical
point
DTSTART:20230215T023000Z
DTEND:20230215T030000Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20388@indico2.riken.jp
DESCRIPTION:Speakers: Shoichi Sasaki (Tohoku University)\n\nWe present res
ults for the axial charge and root-mean-square (RMS) radii of the nucleon
obtained from 2+1 flavor lattice QCD at the physical point with a large sp
atial extent of about 10 fm. Our calculations are performed with the PACS1
0 gauge configurations generated by the PACS Collaboration with the six st
out-smeared $O(a)$ improved Wilson-clover quark action and Iwasaki gauge a
ction at $\\beta$ = 1.82 and 2.00 corresponding to lattice spacings of 0.0
85 fm and 0.063 fm respectively. We first evaluate the value of $g_A/g_V$\
, which is not renormalized in the continuum limit and thus ends up with t
he renormalized axial charge. Moreover\, we also calculate the nucleon ela
stic form factors and determine three kinds of isovector RMS radii such as
electric\, magnetic and axial ones at the two lattice spacings. We finall
y discuss the discretization uncertainties on renormalized axial charge an
d isovector RMS radii towards the continuum limit.\n\nhttps://indico2.rike
n.jp/event/4385/contributions/20388/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20388/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pion light-cone distribution amplitude from a heavy-quark operator
product expansion
DTSTART:20230215T043000Z
DTEND:20230215T051500Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20394@indico2.riken.jp
DESCRIPTION:Speakers: Issaku Kanamori (RIKEN RCCS)\, Santanu Mondal (Los A
lamos National Laboratory)\, Yong Zhao (Argonne National Laboratory)\, Wil
liam Detmold (MIT)\, Anthony Grebe (Fermilab)\, Robert Perry (University o
f Barcelona)\, C.-J. David Lin (Institute of Physics\, National Yang Ming
Chiao Tung University)\n\nIn this talk\, I will discuss the method of the
heavy-quark operator product expansion (HOPE) in lattice-QCD computations
for parton physics. The extraction of the Mellin moments of the pion ligh
t-cone distribution amplitude is employed as an illustration of this appro
ach. I will present numerical results of the second and the fourth moment
s (the latter being exploratory).\n\nhttps://indico2.riken.jp/event/4385/c
ontributions/20394/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20394/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gauge-equivariant neural networks as preconditioners in lattice QC
D
DTSTART:20230215T014500Z
DTEND:20230215T023000Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20398@indico2.riken.jp
DESCRIPTION:Speakers: Tilo Wettig (University of Regensburg)\n\nWe demonst
rate that a state-of-the art multi-grid preconditioner can be learned effi
ciently by gauge-equivariant neural networks. We show that the models requ
ire minimal re-training on different gauge configurations of the same gaug
e ensemble and to a large extent remain efficient under modest modificatio
ns of ensemble parameters. We also demonstrate that important paradigms su
ch as communication avoidance are straightforward to implement in this fra
mework.\n\nhttps://indico2.riken.jp/event/4385/contributions/20398/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20398/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor renormalization group approach to higher-dimensional lattic
e field theories
DTSTART:20230216T074500Z
DTEND:20230216T083000Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20391@indico2.riken.jp
DESCRIPTION:Speakers: Shinichiro Akiyama (The University of Tokyo)\n\nThe
tensor renormalization group (TRG) approach is a variant of the real-space
renormalization group to evaluate the path integral defined on the thermo
dynamic lattice\, without resorting to any probabilistic interpretation fo
r the given Boltzmann weight. Moreover\, since the TRG can directly deal w
ith the Grassmann variables\, this approach can be formulated in the same
manner for the systems with bosons\, fermions\, or both. These advantages
of the TRG approach have been confirmed by the earlier studies of various
lattice theories\, which suggest that the TRG potentially enables us to in
vestigate the parameter regimes where it is difficult to access with the s
tandard stochastic numerical methods\, such as the Monte Carlo simulation.
\nIn this talk\, explaining our recent applications of the TRG approach to
several (3+1)-dimensional field theories on a lattice\, we demonstrate th
e efficiency of the TRG as a tool to investigate higher-dimensional theori
es and future perspectives.\n\nhttps://indico2.riken.jp/event/4385/contrib
utions/20391/
LOCATION:Seminar Room (1F)
URL:https://indico2.riken.jp/event/4385/contributions/20391/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent results in the HAL QCD method
DTSTART:20230217T043000Z
DTEND:20230217T051500Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20393@indico2.riken.jp
DESCRIPTION:Speakers: Sinya Aoki (Kyoto University)\n\nWe first review the
oretical aspects of the HAL QCD method\, by comparing its pros and cons wi
th the finite volume method. We then present the latest investigations in
the HAL QCD method. In particular\, we report on dibaryons and exotics at
the almost physical pion mass.\n\nhttps://indico2.riken.jp/event/4385/cont
ributions/20393/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20393/
END:VEVENT
BEGIN:VEVENT
SUMMARY:PACS10 project
DTSTART:20230217T014500Z
DTEND:20230217T023000Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20395@indico2.riken.jp
DESCRIPTION:Speakers: Takeshi Yamazaki (University of Tsukuba)\n\nWe are g
enerating the 2+1 flavor PACS10 configuration\, whose \nphysical volumes a
re more than (10 fm)$^4$ at the physical point\,\nusing the Iwasaki gauge
action and $N_f=2+1$ stout-smeared \nnonperturbatively $O(a)$ improved Wil
son quark action at \nthree lattice spacings. We present our results for s
everal physical\nquantities calculated from the PACS10 configurations\, su
ch as\nthe pseudoscalar decay constant and kaon semileptonic form factors.
\n\nhttps://indico2.riken.jp/event/4385/contributions/20395/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20395/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Machine learning and Lattice QCD
DTSTART:20230215T010000Z
DTEND:20230215T014500Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20396@indico2.riken.jp
DESCRIPTION:Speakers: Akio Tomiya (IPUT Osaka)\n\nIn this presentation\, I
will discuss applications of machine learning techniques in Lattice QCD.
Lattice QCD has physical symmetries and quantum-statistical features compa
red to standard machine learning in image processing. I mainly explain the
gauge covariant neural network\, capable of these symmetries and features
\, and its applications in the context of exact simulations. I will also b
riefly mention the LatticeQCD.jl library\, which enables lattice QCD simul
ations using the gauge covariant neural network with LLVM compiling techno
logy.\n\nhttps://indico2.riken.jp/event/4385/contributions/20396/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20396/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Diagnosing trivializing map
DTSTART:20230216T070000Z
DTEND:20230216T074500Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20392@indico2.riken.jp
DESCRIPTION:Speakers: Nobuyuki Matsumoto (RIKEN BNL)\n\nCritical slowing d
own is one of the major difficulties in lattice QCD. Recently\, it is beco
ming an urgent problem in the field as the precision goal is getting high
and small lattice spacings have become demanding. As a promising approach
towards conquering this problem\, we here study the idea of the trivializi
ng map\, proposed by Luscher. In particular\, we study the properties of t
he map at large beta using a toy model\, and discuss how conventional appr
oximations are insufficient to realize the triviality. We also consider po
ssible strategies to circumvent the obstacles.\n\nhttps://indico2.riken.jp
/event/4385/contributions/20392/
LOCATION:Seminar Room (1F)
URL:https://indico2.riken.jp/event/4385/contributions/20392/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emergence of an expanding (3+1)-dimensional spacetime in the type
IIB matrix model
DTSTART:20230215T061000Z
DTEND:20230215T064000Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20399@indico2.riken.jp
DESCRIPTION:Speakers: Asato Tsuchiya (Shizuoka University)\, Mitsuaki Hira
sawa (Istituto Nazionale di Fisica Nucleare)\, Jun Nishimura (High Energy
Accelerator Research Organizaiton (KEK) and Graduate University for Advanc
ed Studies (SOKENDAI))\, Konstantinos N. Anagnostopoulos (National Techni
cal University of Athens)\, Stratos Papadoudis (National Technical Univers
ity of Athens)\, Kohta Hatakeyama (High Energy Accelerator Research Organi
zaiton (KEK))\, Takehiro Azuma (Setsunan University)\n\nThe type IIB matri
x model\, also known as the IKKT model\, is a promising candidate for the
non-perturbative formulation of the string theory. Its Lorentzian version\
, in which the indices are contracted using the Lorentzian metric\, has a
sign problem stemming from e^{iS} in the partition function (where S is th
e action). It has turned out that the Lorentzian version is equivalent to
the Euclidean version\, in which the SO(10) rotational symmetry is spontan
eously broken to SO(3)\, under the Wick rotation as it is. This leads us t
o add the Lorentz-invariant mass term to the Lorentzian version of the typ
e IIB matrix model. The model we study involves a sign problem\, and we pe
rform numerical simulations based on the complex Langevin method\, a stoch
astic process for complexified variables. We discuss the possibility of th
e emergence of the (3+1)-dimensional expanding universe.\n\nhttps://indico
2.riken.jp/event/4385/contributions/20399/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20399/
END:VEVENT
BEGIN:VEVENT
SUMMARY:B meson exclusive semileptonic decays from JLQCD
DTSTART:20230215T051500Z
DTEND:20230215T054500Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20397@indico2.riken.jp
DESCRIPTION:Speakers: Issaku Kanamori (RIKEN RCCS)\, Hidenori Fukaya (Osak
a University)\, Shoji Hashimoto (KEK)\, Protick Mohanta (KEK)\, Yasumichi
Aoki (RIKEN)\, Ryan Kellermann (SOKENDAI)\, Yoshifumi Nakamura (RIKEN AICS
)\, Takashi Kaneko (KEK)\n\nWe report on JLQCD's studies on B meson semile
ptonic decays.\n\nhttps://indico2.riken.jp/event/4385/contributions/20397/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20397/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Curved domain-wall fermions
DTSTART:20230215T070000Z
DTEND:20230215T070100Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20402@indico2.riken.jp
DESCRIPTION:Speakers: Hidenori Fukaya (Osaka University)\, Shoto Aoki\n\nW
e consider fermion systems on a square lattice with a mass term having a c
urved domain-wall. It is shown that massless and chiral edge states appear
on the wall. In the cases of $S^1$ and $S^2$ domain-walls embedded into f
lat cubic lattices\, we find that these edge modes feel gravity through th
e induced Spin or Spin$^c$ connections. The gravitational effect is encode
d in the Dirac eigenvalue spectrum as a gap from zero. In the standard con
tinuum extrapolation of the square lattice\, we find a good agreement with
the analytic prediction in the continuum theory. We also discuss how to c
ouple the system to the gauge field and how to detect its nontrivial anoma
ly inflow between the bulk and edge.\n\nhttps://indico2.riken.jp/event/438
5/contributions/20402/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20402/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Precision computation of nucleon scalar and tensor couplings at th
e physical point
DTSTART:20230215T070100Z
DTEND:20230215T070200Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20403@indico2.riken.jp
DESCRIPTION:Speakers: Ken-Ichi Ishikawa (Hiroshima University\, Department
of Physical Science)\, Yoshinobu Kuramashi (Center for Computational Scie
nces\, University of Tsukuba)\, Shoichi Sasaki (Tohoku University)\, Yasum
ichi Aoki (RIKEN)\, Eigo Shintani (University of Tsukuba)\, Takeshi Yamaza
ki (University of Tsukuba)\, Ryutaro Tsuji (Tohoku University)\n\nWe prese
nt the results of nucleon structure studies measured in 2+1 flavor QCD wit
h physical light quarks in large spatial extents of about 10 and 5 fm. Our
calculations are performed on 2+1 flavor gauge configurations generated b
y the PACS Collaboration with the stout-smeared O(a) improved Wilson fermi
ons and Iwasaki gauge action at beta=1.82 corresponding to the lattice spa
cing of 0.085 fm. This poster mainly focuses on nucleon isovector scalar a
nd tensor couplings. Especially\, the tensor coupling is known as the 1st
Mellin moment of transversity parton distribution and is itself related to
the information of quark-EDM.\n\nhttps://indico2.riken.jp/event/4385/cont
ributions/20403/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20403/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum simulation for correlated quantum many-body systems on noi
sy quantum devices
DTSTART:20230216T051500Z
DTEND:20230216T054500Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20401@indico2.riken.jp
DESCRIPTION:Speakers: Rongyang Sun\n\nUnderstanding the nature of correlat
ed quantum many-body systems is the main purpose of modern condensed matte
r physics. Current booming quantum computing techniques offer a new way to
treat these challenging systems: the quantum simulation approach. Using t
he quantum computer\, which is a controllable quantum many-body system by
itself\, we can simulate other correlated quantum systems in which we have
interests. However\, since we are currently in the noisy intermediate-sca
le quantum (NISQ) era\, specific algorithms need to be developed to maxima
lly utilize current noisy quantum devices (NISQ devices). Here\, I will in
troduce one of the main algorithms on NISQ devices\, the variational quant
um eigensolver (VQE)\, and its application to study correlated quantum man
y-body systems.\n\nhttps://indico2.riken.jp/event/4385/contributions/20401
/
LOCATION:Seminar Room (1F)
URL:https://indico2.riken.jp/event/4385/contributions/20401/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Controlling residual chiral symmetry breaking effects of domain wa
ll fermions in QCD thermodynamics
DTSTART:20230215T070300Z
DTEND:20230215T070400Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20405@indico2.riken.jp
DESCRIPTION:Speakers: Hidenori Fukaya (Osaka University)\, Issaku Kanamori
(RIKEN)\, Shoji Hashimoto (KEK)\, Yu Zhang (RIKEN R-CCS)\, Jishnu Goswami
(RIKEN Center for Computational Science)\, Takashi Kaneko (KEK)\, Sinya A
oki (Kyoto University)\, Yoshifumi Nakamura (RIKEN AICS)\, Yasumichi Aoki
(RIKEN)\n\nInvestigation of QCD thermodynamics for $N_f$=2+1 along the lin
es of constant physics with Möbius domain wall fermions is underway. At o
ur coarsest lattice $N_t$=12\, reweighting to overlap fermions is not succ
essful. To use domain wall fermions with the residual mass larger than ave
rage physical $ud$ quarks\, careful treatments of the residual chiral symm
etry breaking are necessary. One of the examples is the chiral condensate
where a UV power divergence associated with the residual chiral symmetry b
reaking emerges with a coefficient not known a priori. In this presentatio
n we introduce first the setup of the computations and then discuss method
ologies to overcome potential problems towards the continuum limit in this
setup.\n\nhttps://indico2.riken.jp/event/4385/contributions/20405/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20405/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On equivalence between Yang-Mills gradient flow and stout smearing
DTSTART:20230215T070600Z
DTEND:20230215T070700Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20408@indico2.riken.jp
DESCRIPTION:Speakers: Shoichi Sasaki (Tohoku University)\, Keita Sakai (To
hoku University)\, Masato Nagatsuka (Tohoku University)\n\nSimilarity betw
een the Yang-Mills gradient flow and the stout smearing was first implied
by M. Lüscher in 2010 and the rigorous proof of the equivalence was recen
tly given by K. Sakai and S. Sasaki at the zero limit of the lattice spaci
ng and the smearing parameter. \nHowever\, it is not obvious that they rem
ain equivalent even with finite parameters within some numerical precision
\, therefore we verified the equivalence by comparing the energy density $
\\langle E\\rangle$ measured in numerical simulations.\n\nhttps://indico2.
riken.jp/event/4385/contributions/20408/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20408/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Benchmark result of Lattice QCD code set Bridge++ 2.0 on Fugaku
DTSTART:20230215T070400Z
DTEND:20230215T070500Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20406@indico2.riken.jp
DESCRIPTION:Speakers: Kazuyuki Kanaya (University of Tsukuba)\, Keigo Nita
dori\, Yusuke Namekawa (Hiroshima University)\, Tatusmi Aoyama (University
of Tokyo)\, Hideo Matsufuru (KEK)\, Issaku Kanamori (RIKEN)\n\nWe have be
en developing a general purpose lattice QCD code set Bridge++ [1] and its
new version contains an optimization for A64FX systems like supercomputer
Fugaku. In this presentation\, we show the benchmark results of Bridge++ o
n Fugaku.\n\nThe bottleneck of LQCD application is solving linear equation
s\, Dx = b\, where fermion matrix D is a large sparse matrix and its opera
tion is a stencil computation on four-dimensional space-time lattice. We a
pply iterative algorithms to solve this equation. Therefore\, the performa
nce of D multiplication is rucially important. The shape of matrix D is no
t unique and Bridge++ has implementation of several types of D that are wi
dely used in the LQCD simulations. The benchmark result covers the perform
ance of the following types of D: Wilson\, Clover\, Staggered\, Domainwall
\, and their site even-odd preconditioned version. In the implementation\,
we adopt so-called Array of Structure of Array (AoSoA) data structure to
use the SIMD feature of A64FX\, and the lattice site degrees of\nfreedom i
s vectorized. We use 2-dimensional tiling of the lattice sites for the SIM
D vectorization. The kernel codes are written using the Arm C-Language Ext
ension (ACLE). The communication to exchange the boundary data is overlapp
ed with the bulk computations. More details of the implementation for Fuga
ku are found in [2] and [3].\n\nAs mixed precision schemes are often used
in the iterative solvers\, we implement the fermion matrix D in both doubl
e- and single- precisions. The performance of D multiplication is around 4
00 GFlops/node in the single precision. We observe a very good weak scalin
g up to 512 nodes\, which is the largest benchmark we tried. We also obser
ve a good weak scaling of iterative BiCGstab (or CG) solvers.\n\n[1] Latti
ce QCD code Bridge++\, https://bridge.kek.jp/lattice-code/.\n[2] Tatsumi A
oyama\, Issaku Kanamori\, Kazuyuki Kanaya\, Hideo Matsufuru and Yusuke Nam
ekawa\, PoS LATTICE2022 (2023) 284\, https://doi.org/10.22323/1.430.0284.\
n[3] Issaku Kanamori\, Keigo Nitadori and Hideo Matsufuru\, to appear in I
nternational Conference on High Performance Computing in Asia-Pacific Regi
on Workshops (HPCASIA-WORKSHOP 2023)\, February 27-March 2\, 2023\, Raffle
s Blvd\, Sin-\ngapore. ACM\, New York\, NY\, USA\, 10 pages. [doi:10.1145/
3581576.3581610]\n\nhttps://indico2.riken.jp/event/4385/contributions/2040
6/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20406/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The analysis of the phase structure of the CP(1) with the theta te
rm by tensor renormalization group
DTSTART:20230215T070900Z
DTEND:20230215T071000Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20411@indico2.riken.jp
DESCRIPTION:Speakers: Katsumasa Nakayama (Riken)\, Karl Jansen\, Stefan Ku
hn\, Lena Funcke\, Ying-Jer Kao\n\nIn this work\, we investigate the CP(1)
model using the tensor renormalization group technic\, which does not suf
fer from the sign problem. The phase structure of the CP(1) model with the
theta term is an interesting topic since it could be related to the well-
known Haldane's conjectures. We apply the recent tensor renormalization te
chnic to the CP(1) model and show that the CP(1) model has no second-order
transition at theta = pi\, up to the beta \n\nhttps://indico2.riken.jp/ev
ent/4385/contributions/20411/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20411/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice study of the trace anomaly contribution to glueball mass u
sing renormalized energy-momentum tensor
DTSTART:20230215T070200Z
DTEND:20230215T070300Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20404@indico2.riken.jp
DESCRIPTION:Speakers: Shoichi Sasaki (Tohoku University)\, Keita Sakai (To
hoku University)\n\nIt is a fundamental question: what is the origin of th
e glueball masses? In the pure Yang-Mills theory\, there is no mass scale
in the classical level\, while the breaking of scale invariance is induced
by quantum effects. This is regarded as the trace anomaly\, which is asso
ciated with the non-vanishing trace of the energy-momentum tensor (EMT) op
erator. In this context\, the origin of the glueball masses can be attribu
ted to the trace anomaly. Our purpose is to quantify how much the trace an
omaly contributes to the glueball masses by using lattice simulations. Onc
e one can have the renormalized EMT operator $T_{\\mu\\nu}$\, the hadron m
atrix element of $T_{00}$ directly provides the mass of hadron. Therefore\
, it is natural to consider the mass decomposition in terms of the trace a
nd traceless part of the EMT operator. However\, it is hard to construct t
he renormalized EMT operator on the lattice\, where the loss of translatio
nal invariance is inevitable due to the discretization of the space-time.
To overcome this problem\, H. Suzuki proposed that the gradient Yang-Mills
flow approach can be utilized to construct the renormalized EMT operator
from the flowed fields. In this talk\, we directly measure the glueball ma
trix element of $T_{00}$ that is calculated by the gradient flow method\,
and then evaluate the contributions of the trace anomaly to the scalar glu
eball mass.\n\nhttps://indico2.riken.jp/event/4385/contributions/20404/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20404/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Inclusive semi-leptonic decays of charmed mesons with Möbius doma
in wall fermions
DTSTART:20230215T054500Z
DTEND:20230215T061000Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20432@indico2.riken.jp
DESCRIPTION:Speakers: Takashi Kaneko (KEK)\, Andreas Juettner (University
of Southampton)\, Shoji Hashimoto (KEK)\, Alessandro Barone (University of
Southampton)\, Ryan Kellermann (SOKENDAI)\n\nWe perform a non-perturbativ
e lattice calculation of the decay rates for inclusive semi-leptonic decay
s of charmed mesons. In view of the long-standing tension in the determina
tion of the CKM matrix elements $|V_{ub}|$ and $|V_{cb}|$ from exclusive a
nd inclusive processes\, recently\, the use of lattice QCD has been extend
ed towards the description of inclusive decays. Since the determination of
hadronic input parameters from QCD based methods require independent test
s\, we focus on the charm sector\, since it not only offers experimental d
ata\, but also well determined CKM parameters.\nWe carry out a pilot latti
ce simulation for the $D_s \\rightarrow X_s \\ell\\nu$ and explore the imp
rovement of existing techniques. Our simulation employs Möbius domain-wal
l charm and strange quarks whose masses are tuned to be approximately phys
ical and we cover the whole kinematical region. We report on our progress
in analyzing different sources of systematic effects\, especially the cont
ribution from the extrapolation of the kernel function chosen for the Cheb
syhev approximation.\n\nhttps://indico2.riken.jp/event/4385/contributions/
20432/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20432/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Application of mass reweighting in (2+1)-flavor QCD thermodynamics
with Mo ̈bius Domain Wall fermions
DTSTART:20230215T070500Z
DTEND:20230215T070600Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20407@indico2.riken.jp
DESCRIPTION:Speakers: Issaku Kanamori (RIKEN RCCS)\, Yoshifumi Nakamura (R
IKEN AICS)\, Yu Zhang\, Yasumichi Aoki (RIKEN)\, Jishnu Goswami (RIKEN Cen
ter for Computational Science)\n\nOne of the motivation for studying QCD t
hermodynamics is to understand the chiral symmetry restoration at finite t
emperature. Lattice QCD (LQCD) calculations with chiral fermions at finite
temperature can be carried out on modern supercomputers nowadays. M\\"{o}
bius Domain Wall fermions in 5-d represent one realization of chiral fermi
ons\, with slight chiral symmetry breaking due to the finite size in the f
ifth dimension. Therefore\, we refer to them as ``almost" chiral fermions.
\n\nIn this poster\, we will examine the use of ``almost" chiral fermions
to evaluate the effectiveness and usefulness of the mass reweightingin the
light quark sector on finite temperature lattices. In the "almost" chiral
fermion case\, one needs to perform the configuration generation twice. T
he first step involves identifying the small amount of chiral symmetry bre
aking ($m_{res}$)\, and the second step involves correcting the input quar
k masses by subtracting the $m_{res}$ effect. The mass reweighting method
allows for reweighting observables generated using one mass value to obtai
n the value in other mass values\, thus eliminating the need to generate n
ew configurations with corrected input masses. we will be using the mass r
eweighting on ensembles generated by the JLQCD collaboration that utilizes
5-d M\\"{o}bius Domain Wall fermions.\n\nWe will use the Bridge++: 2.0 co
de base on the Fugaku supercomputer to calculate reweighting factors with
practical parameters and demonstrate when it is successful and when it fai
ls. This is important because we only have a limited number of configurati
ons available. Additionally\, we will apply the reweighting method to real
calculations and present the observables before and after reweighting.\n\
nhttps://indico2.riken.jp/event/4385/contributions/20407/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20407/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite temperature QCD phase transition with 3 flavors of Mobius d
omain wall fermions
DTSTART:20230216T024500Z
DTEND:20230216T031500Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20400@indico2.riken.jp
DESCRIPTION:Speakers: Shoji Hashimoto (KEK)\, Yasumichi Aoki (RIKEN)\, Yos
hifumi Nakamura (RIKEN AICS)\, Issaku Kanamori (RIKEN RCCS)\, Takashi Kane
ko (KEK)\, Yu Zhang\n\nWe investigate the finite temperature QCD phase tra
nsition with three degenerate quark flavors using Mobius domain wall fermi
ons. To explore the order of phase transition on the lower left corner of
Columbia plot and if possible\, to locate the critical endpoint\n we perfo
rmed simulations at temperatures around 181 and 121 MeV with lattice spaci
ng $a=0.1361(20)$~fm corresponding to temporal lattice extent $N_{\\tau}=8
\,12$ with varying quark mass for two different volumes with aspect ratios
$N_{\\sigma}/N_{\\tau}$ ranging from 2 to 3. By analyzing the volume and
mass dependence of the chiral condensate\, disconnected chiral susceptibil
ity and Binder cumulant we find that there is a crossover at $m_q^{\\mathr
m{\\overline {MS}}}(2\\\, \\mathrm{GeV}) \\sim 44\\\, \\mathrm{MeV}$ for $
\\mathrm{T_{pc}}\\sim$ 181 MeV\, At temperature 121 MeV\, the binder cumul
ant suggests a crossover at $m_q^{\\mathrm{\\overline {MS}}}(2\\\, \\mat
hrm{GeV}) \\sim 3.7\\\, \\mathrm{MeV}$\, \nalthough a study of volume depe
ndence would be important to confirm this.\n\nhttps://indico2.riken.jp/eve
nt/4385/contributions/20400/
LOCATION:Seminar Room (1F)
URL:https://indico2.riken.jp/event/4385/contributions/20400/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emergence of an expanding (3+1)-dimensional spacetime in the type
IIB matrix model
DTSTART:20230215T071000Z
DTEND:20230215T071100Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20415@indico2.riken.jp
DESCRIPTION:Speakers: Takehiro Azuma (Setsunan University)\n\nThe type IIB
matrix model\, also known as the IKKT model\, is a promising candidate fo
r the non-perturbative formulation of the string theory. Its Lorentzian ve
rsion\, in which the indices are contracted using the Lorentzian metric\,
has a sign problem stemming from e^{iS} in the partition function (where S
is the action). It has turned out that the Lorentzian version is equivale
nt to the Euclidean version\, in which the SO(10) rotational symmetry is s
pontaneously broken to SO(3)\, under the Wick rotation as it is. This lead
s us to add the Lorentz-invariant mass term to the Lorentzian version of t
he type IIB matrix model. The model we study involves a sign problem\, and
we perform numerical simulations based on the complex Langevin method\, a
stochastic process for complexified variables. We discuss the possibility
of the emergence of the (3+1)-dimensional expanding universe.\n\nhttps://
indico2.riken.jp/event/4385/contributions/20415/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20415/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite temperature QCD phase transition with 3 flavors of Mobius d
omain wall fermions
DTSTART:20230215T071100Z
DTEND:20230215T071200Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20416@indico2.riken.jp
DESCRIPTION:Speakers: Yu Zhang (RIKEN R-CCS)\n\nWe investigate the finite
temperature QCD phase transition with three degenerate quark flavors using
Mobius domain wall fermions. To explore the order of phase transition on
the lower left corner of Columbia plot and if possible\, to locate the cri
tical endpoint\n we performed simulations at temperatures around 181 and 1
21 MeV with lattice spacing $a=0.1361(20)$~fm corresponding to temporal la
ttice extent $N_{\\tau}=8\,12$ with varying quark mass for two different v
olumes with aspect ratios $N_{\\sigma}/N_{\\tau}$ ranging from 2 to 3. By
analyzing the volume and mass dependence of the chiral condensate\, discon
nected chiral susceptibility and Binder cumulant we find that there is a c
rossover at $m_q^{\\mathrm{\\overline {MS}}}(2\\\, \\mathrm{GeV}) \\sim 44
\\\, \\mathrm{MeV}$ for $\\mathrm{T_{pc}}\\sim$ 181 MeV\, At temperature 1
21 MeV\, the binder cumulant suggests a crossover at $m_q^{\\mathrm{\\ove
rline {MS}}}(2\\\, \\mathrm{GeV}) \\sim 3.7\\\, \\mathrm{MeV}$\, \nalthou
gh a study of volume dependence would be important to confirm this.\n\nhtt
ps://indico2.riken.jp/event/4385/contributions/20416/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20416/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum simulation for correlated quantum many-body systems on noi
sy quantum devices
DTSTART:20230215T071200Z
DTEND:20230215T071300Z
DTSTAMP:20240528T050500Z
UID:indico-contribution-20417@indico2.riken.jp
DESCRIPTION:Speakers: Rongyang Sun\n\nUnderstanding the nature of correlat
ed quantum many-body systems is the main purpose of modern condensed matte
r physics. Current booming quantum computing techniques offer a new way to
treat these challenging systems: the quantum simulation approach. Using t
he quantum computer\, which is a controllable quantum many-body system by
itself\, we can simulate other correlated quantum systems in which we have
interests. However\, since we are currently in the noisy intermediate-sca
le quantum (NISQ) era\, specific algorithms need to be developed to maxima
lly utilize current noisy quantum devices (NISQ devices). Here\, I will in
troduce one of the main algorithms on NISQ devices\, the variational quant
um eigensolver (VQE)\, and its application to study correlated quantum man
y-body systems.\n\nhttps://indico2.riken.jp/event/4385/contributions/20417
/
LOCATION:Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20417/
END:VEVENT
END:VCALENDAR