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Jing- Jing Geng (Yangzhou University)29/04/2026, 16:35
Abstract
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Bayesian analysis methodologies provide a robust framework for systematically integrating prior knowledge to refine the understanding of parameter spaces in theoretical models. Consequently, this approach has emerged as a pivotal tool in research domains such as nuclear physics and nuclear astrophysics. Leveraging experimental data from finite nuclei, we employ Bayesian analysis to... -
Tsuneo NODA (Kurume Institute of Technology)29/04/2026, 16:35
Neutron stars are compact objects that can be likened to a single gigantic nucleus. Their central density exceeds nuclear density, allowing diverse states to appear that are not seen in ordinary nuclei, such as hyperon mixing, quark deconfinement and nucleon superfluidity. These states strongly affect the neutrino emission dominating neutron star cooling, thereby determining their thermal...
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Kanji Mori (Keio University)29/04/2026, 16:35
Recent studies on the dark photon (DP) production in collapsing stars argue that the cooling effect induced by DPs can hinder supernova explosions and lead to a ``failing supernova" constraint on the photon-DP mixing parameter $\epsilon$. In order to verify the idea, we perform two-dimensional neutrino-radiation hydrodynamic simulations coupled with the DP production with the masses of 0.3 and...
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Takumi Muto (千葉工業大学)29/04/2026, 16:35
We consider a response of kaon-condensed phase in hyperon-mixed matter [(Y+K) phase] to neutron-star oscillations. We obtain the sound velocity propagating in the (Y+K) phase out of chemical equilibrium with respect to the relevant weak reactions, searching for signals unique to kaon condensation associated with typical gravitational wave modes. The dissipation of vibrational energy including...
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Tatsuya Matsuki (Tokyo University of Science)29/04/2026, 16:35
This study focuses on constructing equations of state based on relativistic mean-field (RMF) theory to investigate the impact of remaining uncertainties in nuclear matter properties. We examine two key factors: the nucleon effective mass and the presence of multineutron states in non-uniform nuclear matter.
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Our results demonstrate that a larger nucleon effective mass within the RMF enhances... -
Xuhao Wu29/04/2026, 16:35
Title: Impact of Hexaquark H Particle on Compact Star Properties
Abstract： We study the possible existence of the hexaquark H particle (uuddss) in neutron stars. Within the Chromomagnetic Interaction framework, the flavor-singlet H exhibits a mass of 2212.7 MeV. Using the relativistic mean-field model, we explore how H particle couplings influence neutron star structure. Our results...
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Ken'ichiro Nakazato29/04/2026, 16:35
The cooling of protoneutron stars (PNSs) via neutrino emission and the onset of crust formation are both governed by the nuclear equation of state (EOS). In particular, properties of dense matter affect not only the neutrino opacity and thermal evolution, but also the characteristics of heavy nuclei emerging in the outer layers. This suggests a nontrivial interplay between neutrino cooling and...
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Hajime SOTANI (Kochi University)29/04/2026, 16:35
By identifying quasi-periodic oscillations reported in FRB 20240114A (from the Five-hundred-meter Aperture Spherical Telescope) with neutron star crustal torsional oscillations, together with experimental constraints on the nuclear saturation parameter, the incompressibility, we constrain the mass and radius of an extragalactic neutron star at redshift z=0.13. Identifying the low-order QPO...
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Davood Rafiei Karkevandi29/04/2026, 16:35
In this talk, I will discuss the effects of self-interacting bosonic dark matter on neutron stars in light of recent observations from NICER and LIGO/Virgo. In this framework, sub-GeV bosonic dark matter can be present either as a dense core inside the star or as an extended halo around it, modifying key observable properties such as the mass, radius, and tidal deformability. By varying the...
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Mamiya Kawaguchi (Anhui University of Science and Technology)29/04/2026, 16:35
The nucleon mass consists of a chiral-variant part and a chiral-invariant part. This mass decomposition is essential for understanding the properties of dense nuclear matter, especially in the high-density region across the chiral phase transition. While the value of the chiral-invariant mass significantly influences the equation of state of neutron stars, its magnitude remains poorly...
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Mahboubeh Shahrbaf Motlagh (University of Wroclaw)29/04/2026, 16:35
The possible presence of dark matter in neutron star interiors may significantly affect their structure and observable properties. Among various candidates, the hypothetical sexaquark has been proposed as a bosonic dark matter particle that could form under the extreme conditions of neutron star cores. In this work, we investigate whether a hybrid neutron star model including hyperons, bosonic...
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Masayuki Kanazawa (Nagoya University)29/04/2026, 16:35
The baryon mass originates from spontaneous chiral symmetry breaking and a chiral invariant mass. The chiral invariant mass of hyperons has not been sufficiently considered. In this study, we investigate the dependence of the density at which hyperons appear on their chiral invariant masses in neutron star matter. We employ SU(2)L×SU(2)R chiral symmetry and introduce the chiral invariant...
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Yuk-Kei Kong (Nagoya University)29/04/2026, 16:35
The properties of dense, neutron-rich matter are strongly influenced by the isovector structure of the nuclear interaction. In particular, the isovector scalar meson a0(980) (also known as the delta meson) modifies the neutron–proton effective mass splitting and significantly affects the behavior of isospin-asymmetric matter. In this talk, we construct an extended parity doublet model...
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Toshiki Maruyama (JAEA)29/04/2026, 16:35
We formulate molecular dynamics for spin systems by time-dependent SU(2) spinor parametrized with two real angles. With central interaction between particles, the total angular momentum and the total spin are conserved as well as the total energy and momentum.But with inclusion of spin-orbit interaction the total angular momentum and total spin become time-dependent quantity. They convert to...
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Wen-Li Yuan (Peking University)29/04/2026, 16:35
We investigate the stability of beta-equilibrated three-flavor color-superconducting quark matter within the Nambu–Jona–Lasinio model under conditions relevant to compact stars. Owing to the attractive interaction between quarks, color superconductivity is expected to occur, with the color–flavor-locked phase favored at high densities. Motivated by the observations of possible low-mass...
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Young-Ho Song (IRIS, IBS)
We performed ab initio nuclear lattice calculations of the neutron-rich carbon and oxygen isotopes using high-fidelity chiral interactions and found good agreement in binding energy. We discuss correlations associated with each two-nucleon interaction channel.
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