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BEGIN:VEVENT
SUMMARY:Inclusive semi-leptonic decays of charmed mesons with Möbius doma
in wall fermions
DTSTART;VALUE=DATE-TIME:20230215T054500Z
DTEND;VALUE=DATE-TIME:20230215T061000Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20432@indico2.riken.jp
DESCRIPTION:Speakers: Ryan Kellermann (SOKENDAI)\nWe perform a non-perturb
ative lattice calculation of the decay rates for inclusive semi-leptonic d
ecays of charmed mesons. In view of the long-standing tension in the deter
mination of the CKM matrix elements $|V_{ub}|$ and $|V_{cb}|$ from exclusi
ve and inclusive processes\, recently\, the use of lattice QCD has been ex
tended towards the description of inclusive decays. Since the determinatio
n of hadronic input parameters from QCD based methods require independent
tests\, we focus on the charm sector\, since it not only offers experiment
al data\, but also well determined CKM parameters.\nWe carry out a pilot l
attice simulation for the $D_s \\rightarrow X_s \\ell\\nu$ and explore the
improvement of existing techniques. Our simulation employs Möbius domain
-wall charm and strange quarks whose masses are tuned to be approximately
physical and we cover the whole kinematical region. We report on our progr
ess in analyzing different sources of systematic effects\, especially the
contribution from the extrapolation of the kernel function chosen for the
Chebsyhev approximation.\n\nhttps://indico2.riken.jp/event/4385/contributi
ons/20432/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20432/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum simulation for correlated quantum many-body systems on noi
sy quantum devices
DTSTART;VALUE=DATE-TIME:20230215T071200Z
DTEND;VALUE=DATE-TIME:20230215T071300Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20417@indico2.riken.jp
DESCRIPTION:Speakers: Rongyang Sun ()\nUnderstanding the nature of correla
ted quantum many-body systems is the main purpose of modern condensed matt
er physics. Current booming quantum computing techniques offer a new way t
o treat these challenging systems: the quantum simulation approach. Using
the quantum computer\, which is a controllable quantum many-body system by
itself\, we can simulate other correlated quantum systems in which we hav
e interests. However\, since we are currently in the noisy intermediate-sc
ale quantum (NISQ) era\, specific algorithms need to be developed to maxim
ally utilize current noisy quantum devices (NISQ devices). Here\, I will i
ntroduce one of the main algorithms on NISQ devices\, the variational quan
tum eigensolver (VQE)\, and its application to study correlated quantum ma
ny-body systems.\n\nhttps://indico2.riken.jp/event/4385/contributions/2041
7/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20417/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite temperature QCD phase transition with 3 flavors of Mobius d
omain wall fermions
DTSTART;VALUE=DATE-TIME:20230215T071100Z
DTEND;VALUE=DATE-TIME:20230215T071200Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20416@indico2.riken.jp
DESCRIPTION:Speakers: Yu Zhang (RIKEN R-CCS)\nWe investigate the finite te
mperature QCD phase transition with three degenerate quark flavors using M
obius domain wall fermions. To explore the order of phase transition on th
e lower left corner of Columbia plot and if possible\, to locate the criti
cal endpoint\n we performed simulations at temperatures around 181 and 121
MeV with lattice spacing $a=0.1361(20)$~fm corresponding to temporal latt
ice extent $N_{\\tau}=8\,12$ with varying quark mass for two different vol
umes with aspect ratios $N_{\\sigma}/N_{\\tau}$ ranging from 2 to 3. By an
alyzing the volume and mass dependence of the chiral condensate\, disconne
cted chiral susceptibility and Binder cumulant we find that there is a cro
ssover at $m_q^{\\mathrm{\\overline {MS}}}(2\\\, \\mathrm{GeV}) \\sim 44\\
\, \\mathrm{MeV}$ for $\\mathrm{T_{pc}}\\sim$ 181 MeV\, At temperature 121
MeV\, the binder cumulant suggests a crossover at $m_q^{\\mathrm{\\overl
ine {MS}}}(2\\\, \\mathrm{GeV}) \\sim 3.7\\\, \\mathrm{MeV}$\, \nalthough
a study of volume dependence would be important to confirm this.\n\nhttps
://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:Emergence of an expanding (3+1)-dimensional spacetime in the type
IIB matrix model
DTSTART;VALUE=DATE-TIME:20230215T071000Z
DTEND;VALUE=DATE-TIME:20230215T071100Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20415@indico2.riken.jp
DESCRIPTION:Speakers: Takehiro Azuma (Setsunan University)\nThe type IIB m
atrix model\, also known as the IKKT model\, is a promising candidate for
the non-perturbative formulation of the string theory. Its Lorentzian vers
ion\, in which the indices are contracted using the Lorentzian metric\, ha
s a sign problem stemming from e^{iS} in the partition function (where S i
s the action). It has turned out that the Lorentzian version is equivalent
to the Euclidean version\, in which the SO(10) rotational symmetry is spo
ntaneously broken to SO(3)\, under the Wick rotation as it is. This leads
us to add the Lorentz-invariant mass term to the Lorentzian version of the
type IIB matrix model. The model we study involves a sign problem\, and w
e perform numerical simulations based on the complex Langevin method\, a s
tochastic process for complexified variables. We discuss the possibility o
f the emergence of the (3+1)-dimensional expanding universe.\n\nhttps://in
dico2.riken.jp/event/4385/contributions/20415/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20415/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum simulation for correlated quantum many-body systems on noi
sy quantum devices
DTSTART;VALUE=DATE-TIME:20230216T051500Z
DTEND;VALUE=DATE-TIME:20230216T054500Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20401@indico2.riken.jp
DESCRIPTION:Speakers: Rongyang Sun ()\nUnderstanding the nature of correla
ted quantum many-body systems is the main purpose of modern condensed matt
er physics. Current booming quantum computing techniques offer a new way t
o treat these challenging systems: the quantum simulation approach. Using
the quantum computer\, which is a controllable quantum many-body system by
itself\, we can simulate other correlated quantum systems in which we hav
e interests. However\, since we are currently in the noisy intermediate-sc
ale quantum (NISQ) era\, specific algorithms need to be developed to maxim
ally utilize current noisy quantum devices (NISQ devices). Here\, I will i
ntroduce one of the main algorithms on NISQ devices\, the variational quan
tum eigensolver (VQE)\, and its application to study correlated quantum ma
ny-body systems.\n\nhttps://indico2.riken.jp/event/4385/contributions/2040
1/
LOCATION: Seminar Room (1F)
URL:https://indico2.riken.jp/event/4385/contributions/20401/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite temperature QCD phase transition with 3 flavors of Mobius d
omain wall fermions
DTSTART;VALUE=DATE-TIME:20230216T024500Z
DTEND;VALUE=DATE-TIME:20230216T031500Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20400@indico2.riken.jp
DESCRIPTION:Speakers: Yu Zhang ()\nWe investigate the finite temperature Q
CD phase transition with three degenerate quark flavors using Mobius domai
n wall fermions. To explore the order of phase transition on the lower lef
t corner of Columbia plot and if possible\, to locate the critical endpoin
t\n we performed simulations at temperatures around 181 and 121 MeV with l
attice spacing $a=0.1361(20)$~fm corresponding to temporal lattice extent
$N_{\\tau}=8\,12$ with varying quark mass for two different volumes with a
spect ratios $N_{\\sigma}/N_{\\tau}$ ranging from 2 to 3. By analyzing the
volume and mass dependence of the chiral condensate\, disconnected chiral
susceptibility and Binder cumulant we find that there is a crossover at $
m_q^{\\mathrm{\\overline {MS}}}(2\\\, \\mathrm{GeV}) \\sim 44\\\, \\mathrm
{MeV}$ for $\\mathrm{T_{pc}}\\sim$ 181 MeV\, At temperature 121 MeV\, the
binder cumulant suggests a crossover at $m_q^{\\mathrm{\\overline {MS}}}(
2\\\, \\mathrm{GeV}) \\sim 3.7\\\, \\mathrm{MeV}$\, \nalthough a study of
volume dependence would be important to confirm this.\n\nhttps://indico2.
riken.jp/event/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;VALUE=DATE-TIME:20230215T061000Z
DTEND;VALUE=DATE-TIME:20230215T064000Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20399@indico2.riken.jp
DESCRIPTION:Speakers: Takehiro Azuma (Setsunan University)\nThe type IIB m
atrix model\, also known as the IKKT model\, is a promising candidate for
the non-perturbative formulation of the string theory. Its Lorentzian vers
ion\, in which the indices are contracted using the Lorentzian metric\, ha
s a sign problem stemming from e^{iS} in the partition function (where S i
s the action). It has turned out that the Lorentzian version is equivalent
to the Euclidean version\, in which the SO(10) rotational symmetry is spo
ntaneously broken to SO(3)\, under the Wick rotation as it is. This leads
us to add the Lorentz-invariant mass term to the Lorentzian version of the
type IIB matrix model. The model we study involves a sign problem\, and w
e perform numerical simulations based on the complex Langevin method\, a s
tochastic process for complexified variables. We discuss the possibility o
f the emergence of the (3+1)-dimensional expanding universe.\n\nhttps://in
dico2.riken.jp/event/4385/contributions/20399/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20399/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On equivalence between Yang-Mills gradient flow and stout smearing
DTSTART;VALUE=DATE-TIME:20230215T070600Z
DTEND;VALUE=DATE-TIME:20230215T070700Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20408@indico2.riken.jp
DESCRIPTION:Speakers: Masato Nagatsuka (Tohoku University)\nSimilarity bet
ween 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 rece
ntly given by K. Sakai and S. Sasaki at the zero limit of the lattice spac
ing and the smearing parameter. \nHowever\, it is not obvious that they re
main equivalent even with finite parameters within some numerical precisio
n\, 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:Application of mass reweighting in (2+1)-flavor QCD thermodynamics
with Mo ̈bius Domain Wall fermions
DTSTART;VALUE=DATE-TIME:20230215T070500Z
DTEND;VALUE=DATE-TIME:20230215T070600Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20407@indico2.riken.jp
DESCRIPTION:Speakers: Jishnu Goswami (RIKEN Center for Computational Scien
ce)\nOne of the motivation for studying QCD thermodynamics is to understan
d the chiral symmetry restoration at finite temperature. Lattice QCD (LQCD
) calculations with chiral fermions at finite temperature can be carried o
ut on modern supercomputers nowadays. M\\"{o}bius Domain Wall fermions in
5-d represent one realization of chiral fermions\, with slight chiral symm
etry breaking due to the finite size in the fifth dimension. Therefore\, w
e 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. The first step involves identi
fying the small amount of chiral symmetry breaking ($m_{res}$)\, and the s
econd step involves correcting the input quark masses by subtracting the $
m_{res}$ effect. The mass reweighting method allows for reweighting observ
ables generated using one mass value to obtain the value in other mass val
ues\, thus eliminating the need to generate new configurations with correc
ted input masses. we will be using the mass reweighting on ensembles gener
ated by the JLQCD collaboration that utilizes 5-d M\\"{o}bius Domain Wall
fermions.\n\nWe will use the Bridge++: 2.0 code base on the Fugaku superco
mputer to calculate reweighting factors with practical parameters and demo
nstrate when it is successful and when it fails. This is important because
we only have a limited number of configurations available. Additionally\,
we will apply the reweighting method to real calculations and present the
observables before and after reweighting.\n\nhttps://indico2.riken.jp/eve
nt/4385/contributions/20407/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20407/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor renormalization group approach to (1+1)-dimensional SU(2) p
rincipal chiral model at finite density
DTSTART;VALUE=DATE-TIME:20230215T070800Z
DTEND;VALUE=DATE-TIME:20230215T070900Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20410@indico2.riken.jp
DESCRIPTION:Speakers: XIAO LUO ()\nWe apply the tensor renormalization gro
up method to the (1+1)-dimensional SU(2) principal chiral model at finite
chemical potential with the use of the Gauss-Legendre quadrature to discre
tize the SU(2) Lie group. The internal energy at vanishing chemical potent
ial $µ = 0$ shows good consistency with the prediction of the strong and
weak coupling expansions. This indicates an effectiveness of the Gauss-Leg
endre quadrature for the partitioning of the SU(2) Lie group. In the finit
e density region with $µ\\neq0$ at the strong coupling we observe the Sil
ver-Blaze phenomenon for the number density.\n\nhttps://indico2.riken.jp/e
vent/4385/contributions/20410/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20410/
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;VALUE=DATE-TIME:20230215T070900Z
DTEND;VALUE=DATE-TIME:20230215T071000Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20411@indico2.riken.jp
DESCRIPTION:Speakers: Katsumasa Nakayama (Riken)\nIn this work\, we invest
igate the CP(1) model using the tensor renormalization group technic\, whi
ch does not suffer from the sign problem. The phase structure of the CP(1)
model with the theta term is an interesting topic since it could be relat
ed to the well-known Haldane's conjectures. We apply the recent tensor ren
ormalization technic 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://indi
co2.riken.jp/event/4385/contributions/20411/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20411/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Benchmark result of Lattice QCD code set Bridge++ 2.0 on Fugaku
DTSTART;VALUE=DATE-TIME:20230215T070400Z
DTEND;VALUE=DATE-TIME:20230215T070500Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20406@indico2.riken.jp
DESCRIPTION:Speakers: Issaku Kanamori (RIKEN)\nWe have been developing a g
eneral purpose lattice QCD code set Bridge++ [1] and its new version conta
ins an optimization for A64FX systems like supercomputer Fugaku. In this p
resentation\, we show the benchmark results of Bridge++ on Fugaku.\n\nThe
bottleneck of LQCD application is solving linear equations\, Dx = b\, wher
e fermion matrix D is a large sparse matrix and its operation is a stencil
computation on four-dimensional space-time lattice. We apply iterative al
gorithms to solve this equation. Therefore\, the performance of D multipli
cation is rucially important. The shape of matrix D is not unique and Brid
ge++ has implementation of several types of D that are widely used in the
LQCD simulations. The benchmark result covers the performance of the follo
wing types of D: Wilson\, Clover\, Staggered\, Domainwall\, and their site
even-odd preconditioned version. In the implementation\, we adopt so-call
ed Array of Structure of Array (AoSoA) data structure to use the SIMD feat
ure of A64FX\, and the lattice site degrees of\nfreedom is vectorized. We
use 2-dimensional tiling of the lattice sites for the SIMD vectorization.
The kernel codes are written using the Arm C-Language Extension (ACLE). Th
e communication to exchange the boundary data is overlapped with the bulk
computations. More details of the implementation for Fugaku 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 double- and single- pr
ecisions. The performance of D multiplication is around 400 GFlops/node in
the single precision. We observe a very good weak scaling up to 512 nodes
\, which is the largest benchmark we tried. We also observe a good weak sc
aling of iterative BiCGstab (or CG) solvers.\n\n[1] Lattice QCD code Bridg
e++\, https://bridge.kek.jp/lattice-code/.\n[2] Tatsumi Aoyama\, Issaku Ka
namori\, Kazuyuki Kanaya\, Hideo Matsufuru and Yusuke Namekawa\, PoS LATTI
CE2022 (2023) 284\, https://doi.org/10.22323/1.430.0284.\n[3] Issaku Kanam
ori\, Keigo Nitadori and Hideo Matsufuru\, to appear in International Conf
erence on High Performance Computing in Asia-Pacific Region Workshops (HPC
ASIA-WORKSHOP 2023)\, February 27-March 2\, 2023\, Raffles Blvd\, Sin-\nga
pore. ACM\, New York\, NY\, USA\, 10 pages. [doi:10.1145/3581576.3581610]\
n\nhttps://indico2.riken.jp/event/4385/contributions/20406/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20406/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Controlling residual chiral symmetry breaking effects of domain wa
ll fermions in QCD thermodynamics
DTSTART;VALUE=DATE-TIME:20230215T070300Z
DTEND;VALUE=DATE-TIME:20230215T070400Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20405@indico2.riken.jp
DESCRIPTION:Speakers: Yasumichi Aoki (RIKEN)\nInvestigation of QCD thermod
ynamics for $N_f$=2+1 along the lines of constant physics with Möbius dom
ain wall fermions is underway. At our coarsest lattice $N_t$=12\, reweight
ing to overlap fermions is not successful. To use domain wall fermions wit
h the residual mass larger than average physical $ud$ quarks\, careful tre
atments of the residual chiral symmetry breaking are necessary. One of the
examples is the chiral condensate where a UV power divergence associated
with the residual chiral symmetry breaking emerges with a coefficient not
known a priori. In this presentation we introduce first the setup of the c
omputations and then discuss methodologies to overcome potential problems
towards the continuum limit in this setup.\n\nhttps://indico2.riken.jp/eve
nt/4385/contributions/20405/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20405/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice study of the trace anomaly contribution to glueball mass u
sing renormalized energy-momentum tensor
DTSTART;VALUE=DATE-TIME:20230215T070200Z
DTEND;VALUE=DATE-TIME:20230215T070300Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20404@indico2.riken.jp
DESCRIPTION:Speakers: Keita Sakai (Tohoku University)\nIt is a fundamental
question: what is the origin of the glueball masses? In the pure Yang-Mil
ls theory\, there is no mass scale in the classical level\, while the brea
king of scale invariance is induced by quantum effects. This is regarded a
s the trace anomaly\, which is associated with the non-vanishing trace of
the energy-momentum tensor (EMT) operator. In this context\, the origin of
the glueball masses can be attributed to the trace anomaly. Our purpose i
s to quantify how much the trace anomaly contributes to the glueball masse
s by using lattice simulations. Once one can have the renormalized EMT ope
rator $T_{\\mu\\nu}$\, the hadron matrix element of $T_{00}$ directly prov
ides the mass of hadron. Therefore\, it is natural to consider the mass de
composition in terms of the trace and traceless part of the EMT operator.
However\, it is hard to construct the renormalized EMT operator on the lat
tice\, where the loss of translational invariance is inevitable due to the
discretization of the space-time. To overcome this problem\, H. Suzuki pr
oposed that the gradient Yang-Mills flow approach can be utilized to const
ruct the renormalized EMT operator from the flowed fields. In this talk\,
we directly measure the glueball matrix element of $T_{00}$ that is calcul
ated by the gradient flow method\, and then evaluate the contributions of
the trace anomaly to the scalar glueball 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:Precision computation of nucleon scalar and tensor couplings at th
e physical point
DTSTART;VALUE=DATE-TIME:20230215T070100Z
DTEND;VALUE=DATE-TIME:20230215T070200Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20403@indico2.riken.jp
DESCRIPTION:Speakers: Ryutaro Tsuji (Tohoku University)\nWe present the re
sults of nucleon structure studies measured in 2+1 flavor QCD with physica
l light quarks in large spatial extents of about 10 and 5 fm. Our calculat
ions are performed on 2+1 flavor gauge configurations generated by the PAC
S Collaboration with the stout-smeared O(a) improved Wilson fermions and I
wasaki gauge action at beta=1.82 corresponding to the lattice spacing of 0
.085 fm. This poster mainly focuses on nucleon isovector scalar and tensor
couplings. Especially\, the tensor coupling is known as the 1st Mellin mo
ment of transversity parton distribution and is itself related to the info
rmation of quark-EDM.\n\nhttps://indico2.riken.jp/event/4385/contributions
/20403/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20403/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Curved domain-wall fermions
DTSTART;VALUE=DATE-TIME:20230215T070000Z
DTEND;VALUE=DATE-TIME:20230215T070100Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20402@indico2.riken.jp
DESCRIPTION:Speakers: Shoto Aoki ()\nWe consider fermion systems on a squa
re lattice with a mass term having a curved 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 flat cubic lattices\, we find that th
ese edge modes feel gravity through the induced Spin or Spin$^c$ connectio
ns. The gravitational effect is encoded in the Dirac eigenvalue spectrum a
s a gap from zero. In the standard continuum extrapolation of the square l
attice\, we find a good agreement with the analytic prediction in the cont
inuum theory. We also discuss how to couple the system to the gauge field
and how to detect its nontrivial anomaly inflow between the bulk and edge.
\n\nhttps://indico2.riken.jp/event/4385/contributions/20402/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20402/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Diagnosing trivializing map
DTSTART;VALUE=DATE-TIME:20230216T070000Z
DTEND;VALUE=DATE-TIME:20230216T074500Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20392@indico2.riken.jp
DESCRIPTION:Speakers: Nobuyuki Matsumoto (RIKEN BNL)\nCritical slowing dow
n is one of the major difficulties in lattice QCD. Recently\, it is becomi
ng an urgent problem in the field as the precision goal is getting high an
d small lattice spacings have become demanding. As a promising approach to
wards conquering this problem\, we here study the idea of the trivializing
map\, proposed by Luscher. In particular\, we study the properties of the
map at large beta using a toy model\, and discuss how conventional approx
imations are insufficient to realize the triviality. We also consider poss
ible strategies to circumvent the obstacles.\n\nhttps://indico2.riken.jp/e
vent/4385/contributions/20392/
LOCATION: Seminar Room (1F)
URL:https://indico2.riken.jp/event/4385/contributions/20392/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor renormalization group approach to higher-dimensional lattic
e field theories
DTSTART;VALUE=DATE-TIME:20230216T074500Z
DTEND;VALUE=DATE-TIME:20230216T083000Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20391@indico2.riken.jp
DESCRIPTION:Speakers: Shinichiro Akiyama (The University of Tokyo)\nThe te
nsor renormalization group (TRG) approach is a variant of the real-space r
enormalization group to evaluate the path integral defined on the thermody
namic lattice\, without resorting to any probabilistic interpretation for
the given Boltzmann weight. Moreover\, since the TRG can directly deal wit
h the Grassmann variables\, this approach can be formulated in the same ma
nner for the systems with bosons\, fermions\, or both. These advantages of
the TRG approach have been confirmed by the earlier studies of various la
ttice theories\, which suggest that the TRG potentially enables us to inve
stigate the parameter regimes where it is difficult to access with the sta
ndard stochastic numerical methods\, such as the Monte Carlo simulation.\n
In this talk\, explaining our recent applications of the TRG approach to s
everal (3+1)-dimensional field theories on a lattice\, we demonstrate the
efficiency of the TRG as a tool to investigate higher-dimensional theories
and future perspectives.\n\nhttps://indico2.riken.jp/event/4385/contribut
ions/20391/
LOCATION: Seminar Room (1F)
URL:https://indico2.riken.jp/event/4385/contributions/20391/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sign problem and the Worldvolume Hybrid Monte Carlo method
DTSTART;VALUE=DATE-TIME:20230216T054500Z
DTEND;VALUE=DATE-TIME:20230216T063000Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20387@indico2.riken.jp
DESCRIPTION:Speakers: Masafumi Fukuma (Kyoto University)\nThe numerical si
gn problem is one of the major obstacles to first-principles calculations
in a variety of important systems. Typical examples include finite-density
QCD\, some condensed matter systems such as strongly correlated electron
systems and frustrated spin systems\, and real-time dynamics of quantum fi
elds. Until very recently\, individual methods were developed for each tar
get 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 the
essence of the sign problem and outline some of the approaches proposed i
n line with the movement. I then focus on methods based on the Lefschitz t
himble\, and argue that the "Worldvolume Hybrid Monte Carlo method" [Fukum
a and Matsumoto\, arXiv:2012.08468] is a promising method due to its relia
bility and versatility.\n\nhttps://indico2.riken.jp/event/4385/contributio
ns/20387/
LOCATION: Seminar Room (1F)
URL:https://indico2.riken.jp/event/4385/contributions/20387/
END:VEVENT
BEGIN:VEVENT
SUMMARY:What is chiral susceptibility probing?
DTSTART;VALUE=DATE-TIME:20230216T010000Z
DTEND;VALUE=DATE-TIME:20230216T013000Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20385@indico2.riken.jp
DESCRIPTION:Speakers: Hidenori Fukaya (Osaka University)\nIn the early day
s of QCD\, the axial U(1) anomaly was considered to trigger the breaking o
f the SU(2)_L x SU(2)_R symmetry through topological excitations of gluon
fields. However\, it has been a challenge for lattice QCD to quantify the
effect. In this work\, we simulate QCD at high temperatures with chiral sy
mmetric lattice Dirac operator. The exact chiral symmetry enables us to se
parate the contribution from the axial U (1) breaking from others among th
e susceptibilities in the scalar and pseudoscalar channels. Our result in
two-flavor QCD indicates that the connected and disconnected chiral suscep
tibilities\, 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 grea
ter than 165 MeV.\n\nhttps://indico2.riken.jp/event/4385/contributions/203
85/
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;VALUE=DATE-TIME:20230216T003000Z
DTEND;VALUE=DATE-TIME:20230216T010000Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20386@indico2.riken.jp
DESCRIPTION:Speakers: Oliver Witzel (Siegen University)\nThe renormalizati
on group (RG) $\\beta$ function describes the running of the renormalized
coupling and connects the ultraviolet and infrared regimes of quantum fiel
d theories. Using different gradient flow schemes\, we define renormalized
couplings and determine the RG $\\beta$ function using a more traditional
step-scaling method as well as the concept of the continuous $\\beta$ fun
ction which showcases a direct relation between gradient flow and RG flow.
\n\nWe present results for SU(3) gauge systems with different number of f
lavors in the fundamental representation and discuss advantageous of the c
ontinuous $\\beta$ function. In addition we point our future applications.
\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:B meson exclusive semileptonic decays from JLQCD
DTSTART;VALUE=DATE-TIME:20230215T051500Z
DTEND;VALUE=DATE-TIME:20230215T054500Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20397@indico2.riken.jp
DESCRIPTION:Speakers: Takashi Kaneko (KEK)\nWe report on JLQCD's studies o
n B meson semileptonic decays.\n\nhttps://indico2.riken.jp/event/4385/cont
ributions/20397/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20397/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pion light-cone distribution amplitude from a heavy-quark operator
product expansion
DTSTART;VALUE=DATE-TIME:20230215T043000Z
DTEND;VALUE=DATE-TIME:20230215T051500Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20394@indico2.riken.jp
DESCRIPTION:Speakers: C.-J. David Lin (Institute of Physics\, National Yan
g Ming Chiao Tung University)\nIn this talk\, I will discuss the method of
the heavy-quark operator product expansion (HOPE) in lattice-QCD computat
ions for parton physics. The extraction of the Mellin moments of the pion
light-cone distribution amplitude is employed as an illustration of this
approach. I will present numerical results of the second and the fourth m
oments (the latter being exploratory).\n\nhttps://indico2.riken.jp/event/4
385/contributions/20394/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20394/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon structure from lattice QCD on (10 fm)$^4$ at the physical
point
DTSTART;VALUE=DATE-TIME:20230215T023000Z
DTEND;VALUE=DATE-TIME:20230215T030000Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20388@indico2.riken.jp
DESCRIPTION:Speakers: Shoichi Sasaki (Tohoku University)\nWe present resul
ts for the axial charge and root-mean-square (RMS) radii of the nucleon ob
tained from 2+1 flavor lattice QCD at the physical point with a large spat
ial extent of about 10 fm. Our calculations are performed with the PACS10
gauge configurations generated by the PACS Collaboration with the six stou
t-smeared $O(a)$ improved Wilson-clover quark action and Iwasaki gauge act
ion at $\\beta$ = 1.82 and 2.00 corresponding to lattice spacings of 0.085
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 the
renormalized axial charge. Moreover\, we also calculate the nucleon elast
ic form factors and determine three kinds of isovector RMS radii such as e
lectric\, magnetic and axial ones at the two lattice spacings. We finally
discuss the discretization uncertainties on renormalized axial charge and
isovector RMS radii towards the continuum limit.\n\nhttps://indico2.riken.
jp/event/4385/contributions/20388/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20388/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gauge-equivariant neural networks as preconditioners in lattice QC
D
DTSTART;VALUE=DATE-TIME:20230215T014500Z
DTEND;VALUE=DATE-TIME:20230215T023000Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20398@indico2.riken.jp
DESCRIPTION:Speakers: Tilo Wettig (University of Regensburg)\nWe demonstra
te that a state-of-the art multi-grid preconditioner can be learned effici
ently by gauge-equivariant neural networks. We show that the models requir
e minimal re-training on different gauge configurations of the same gauge
ensemble and to a large extent remain efficient under modest modifications
of ensemble parameters. We also demonstrate that important paradigms such
as communication avoidance are straightforward to implement in this frame
work.\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:Machine learning and Lattice QCD
DTSTART;VALUE=DATE-TIME:20230215T010000Z
DTEND;VALUE=DATE-TIME:20230215T014500Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20396@indico2.riken.jp
DESCRIPTION:Speakers: Akio Tomiya (IPUT Osaka)\nIn this presentation\, I w
ill discuss applications of machine learning techniques in Lattice QCD. La
ttice QCD has physical symmetries and quantum-statistical features compare
d to standard machine learning in image processing. I mainly explain the g
auge covariant neural network\, capable of these symmetries and features\,
and its applications in the context of exact simulations. I will also bri
efly mention the LatticeQCD.jl library\, which enables lattice QCD simulat
ions using the gauge covariant neural network with LLVM compiling technolo
gy.\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:Velocity of Sound beyond the High-Density Relativistic Limit from
Lattice Simulation of Dense Two-Color QCD
DTSTART;VALUE=DATE-TIME:20230217T003000Z
DTEND;VALUE=DATE-TIME:20230217T011500Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20390@indico2.riken.jp
DESCRIPTION:Speakers: Etsuko Itou (iTHEMS\, RIKEN)\nWe obtain the equation
of state (EoS) for two-color QCD at low temperature and high density from
the lattice Monte Carlo simulation. We find that the velocity of sound ex
ceeds the relativistic limit (cs2/c2=1/3) after the BEC-BCS crossover in t
he superfluid phase. Such an excess of the sound velocity is previously un
known from any lattice calculations for QCD-like theories. This finding mi
ght have a possible relevance to the EoS of neutron star matter revealed b
y recent measurements of neutron star masses and radii.\n\nhttps://indico2
.riken.jp/event/4385/contributions/20390/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20390/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent results in the HAL QCD method
DTSTART;VALUE=DATE-TIME:20230217T043000Z
DTEND;VALUE=DATE-TIME:20230217T051500Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20393@indico2.riken.jp
DESCRIPTION:Speakers: Sinya Aoki (Kyoto University)\nWe first review theor
etical aspects of the HAL QCD method\, by comparing its pros and cons with
the finite volume method. We then present the latest investigations in th
e HAL QCD method. In particular\, we report on dibaryons and exotics at th
e almost physical pion mass.\n\nhttps://indico2.riken.jp/event/4385/contri
butions/20393/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20393/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stabilised Wilson Fermions in Action - An overview of recent devel
opments
DTSTART;VALUE=DATE-TIME:20230217T023000Z
DTEND;VALUE=DATE-TIME:20230217T031500Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20389@indico2.riken.jp
DESCRIPTION:Speakers: Anthony Francis (National Yang Ming Chiao Tung Unive
rsity)\nThe stabilised Wilson fermion (SWF) framework combines numerical e
nhancements and a new discretisation scheme for Wilson-Clover fermions. In
this presentation I discuss the components of the framework and give an o
verview of the status of the application of SWF in two cases: Traditional
lattice QCD simulations\, i.e. with spatial lengths less than 6 fm\, and s
imulations with large spatial volumes\, so-called master-field simulations
. \nThe former is being addressed by the newly formed open lattice initiat
ive (OpenLat) and recent work shows some benefits for the SWF\, for exampl
e in terms of discretisation effects. The latter requires also a rethinkin
g of measurement strategies aside of the generation of such large lattices
. Both are challenging tasks and are built upon the concept of stochastic
locality. I highlight some thoughts on how this can be exploited and show
recent numerical results.\n\nhttps://indico2.riken.jp/event/4385/contribut
ions/20389/
LOCATION: Lecture Hall (6F)
URL:https://indico2.riken.jp/event/4385/contributions/20389/
END:VEVENT
BEGIN:VEVENT
SUMMARY:PACS10 project
DTSTART;VALUE=DATE-TIME:20230217T014500Z
DTEND;VALUE=DATE-TIME:20230217T023000Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20395@indico2.riken.jp
DESCRIPTION:Speakers: Takeshi Yamazaki (University of Tsukuba)\nWe are gen
erating the 2+1 flavor PACS10 configuration\, whose \nphysical volumes are
more than (10 fm)$^4$ at the physical point\,\nusing the Iwasaki gauge ac
tion and $N_f=2+1$ stout-smeared \nnonperturbatively $O(a)$ improved Wilso
n quark action at \nthree lattice spacings. We present our results for sev
eral physical\nquantities calculated from the PACS10 configurations\, such
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:HPC simulation of quantum computer
DTSTART;VALUE=DATE-TIME:20230216T043000Z
DTEND;VALUE=DATE-TIME:20230216T051500Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20308@indico2.riken.jp
DESCRIPTION:Speakers: Nobuyasu Ito ()\nSimulation framework named “brake
t” for quantum computer with qubits and gates circuit is developed for m
assively-parallelized HPC systems using the state-vector method. On the
“Fugaku” supercomputer\, simulation for 40 qubits circuit is achieved
using 1\,024 or less nodes\, and if its full nodes are available\, we will
reach 48 qubits with double precision and 51 qubits with byte precision.
Simulation time per gate is less than one second\, though it takes more fo
r circuits more than about 40 qubits. As an application\, quantum variatio
nal algorithm is tested for quantum Heisenberg chain with 40 spins\, which
treats 41 40-qubits circuits and evaluations with system Hamiltonian betw
een the circuits and therefore quantum mechanical state with totally 41 x
40 = 1640 qubits is simulated exactly up to numerical accuracy.\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:QCD software and algorithms for the exascale
DTSTART;VALUE=DATE-TIME:20230216T020000Z
DTEND;VALUE=DATE-TIME:20230216T024500Z
DTSTAMP;VALUE=DATE-TIME:20231205T024543Z
UID:indico-contribution-4385-20306@indico2.riken.jp
DESCRIPTION:Speakers: Peter Boyle (University of Edinburgh)\nI will give a
n overview of the development directions of Grid on current and future US
exascale computers.\nI will also give an overview of the USQCD SciDAC-5 al
gorithm project to develop multiscale algorithms to exploit these.\n\nhttp
s://indico2.riken.jp/event/4385/contributions/20306/
LOCATION: Seminar Room (1F)
URL:https://indico2.riken.jp/event/4385/contributions/20306/
END:VEVENT
END:VCALENDAR