Nuclear Theory·nucl-th

Monday·January 20, 2025

7 papers—3 primary·4 cross-listed

01
[Submitted on 16 Jan 2025]
$Λ$ and $Σ$ potentials in neutron stars, hypernuclei, and heavy-ion collisions
Asanosuke Jinno🇯🇵 · Koichi Murase🇯🇵 · Yasushi Nara🇯🇵
With an appropriate $Y N N$ force, the $Λ$ single-particle potential ( $Λ$ potential) can be made strongly repulsive at high density, and one can solve the hyperon puzzle of neutron stars. We investigate the consistency of such a $Λ$ potential, evaluated recently from $Y N$ and $Y N N$ forces based on chiral effective field theory, with hypernuclear data and heavy-ion collision data. It is found that model calculations with such a $Λ$ potential can reproduce the data of the $Λ$ hypernuclear spectroscopy and the $Λ$ directed flow in heavy-ion collisions. Also, we evaluate the $Σ$ potential, which can be calculated by using the same hyperon forces as for the $Λ$ potential. Specifically, we show that the low-energy constants characterizing the strength of the $Y N N$ force can be chosen to suppress the appearance of the $Λ$ 's in neutron stars while at the same time the empirical value of the $Σ$ potential is reproduced.
Comments:
8 pages, 4 figures, 1 table, Submitted to Proceedings of International Conference on Exotic Atoms and Related Topics and Conference on Low Energy Antiprotons (EXA/LEAP2024)
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2501.09881 [pdf]
PoS(2025)·3 citations
02
[Submitted on 17 Jan 2025]
Nuclear equation of state at finite $μ_{B}$ using deep learning assisted quasi-parton model
Fu-Peng Li🇨🇳 · Long-Gang Pang🇨🇳 · Guang-You Qin🇨🇳
To accurately determine the nuclear equation of state (EoS) at finite baryon chemical potential ( $μ_{B}$ ) remains a challenging yet essential goal in the study of QCD matter under extreme conditions. In this study, we develop a deep learning assisted quasi-parton model, which utilizes three deep neural networks, to reconstruct the QCD EoS at zero $μ_{B}$ and predict the EoS and transport coefficient $η / s$ at finite $μ_{B}$ . The EoS derived from our quasi-parton model shows excellent agreement with lattice QCD results obtained using Taylor expansion techniques. The minimum value of $η / s$ is found to be approximately 175 MeV and decreases with increasing chemical potential within the confidence interval. This model not only provides a robust framework for understanding the properties of the QCD EoS at finite $μ_{B}$ but also offers critical input for relativistic hydrodynamic simulations of nuclear matter produced in heavy-ion collisions by the RHIC beam energy scan program.
Comments:
7 pages, 8 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2501.10012 [pdf]
PLB(2025)·11 citations
03
[Submitted on 17 Jan 2025]
From QCD phenomenology to nuclear physics phenomenology: the chiral confining model
Guy Chanfray🇫🇷 · Magda Ericson🇫🇷 · Hubert Hansen🇫🇷 · Jérôme Margueron🇺🇸 · Marco Martini🇫🇷
We present a theoretical framework allowing to make an explicit connection between the phenomenology of QCD, namely the properties of the gluon correlator and Wilson loops, and a particular relativistic model for the description of nuclear matter and neutron stars, the chiral confining model. Starting with the Field Correlator Method, which incorporates explicitly and simultaneously confinement and chiral symmetry breaking, we describe how to obtain the response of the composite nucleon to the nuclear scalar field, the relative role of confinement and chiral symmetry breaking in the in-medium nucleon mass evolution, generating the three-body forces needed for the saturation mechanism.
Comments:
57 pages, 2 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2501.10177 [pdf]
Symmetry(2025)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE

Λ and Σ potentials in neutron stars, hypernuclei, and heavy-ion collisions

Nuclear equation of state at finite μB​ using deep learning assisted quasi-parton model

From QCD phenomenology to nuclear physics phenomenology: the chiral confining model

Affiliations

$Λ$ and $Σ$ potentials in neutron stars, hypernuclei, and heavy-ion collisions

Nuclear equation of state at finite $μ_{B}$ using deep learning assisted quasi-parton model