Nuclear Theory·nucl-th

Friday·November 17, 2023

7 papers—4 primary·3 cross-listed

05
PSR J $0952 - 0607$ and GW170817: Direct Multimessenger Constraints on Neutron Star Equation of State through a Novel Wide-ranging Correlation
Lan Guo · YiFei Niu
Our knowledge about neutron star (NS) masses is renewed once again due to the recognition of the heaviest NS PSR J $0952 - 0607$ . By taking advantage of both mass observations of super massive neutron stars and the tidal deformability derived from event GW170817, a joint constraint on tidal deformability is obtained. A wide-ranging correlation between NS pressure and tidal deformability within the density range from saturation density $ρ_{0}$ to $5.6 ρ_{0}$ is discovered, which directly yields a constrained NS EoS. The newly constrained EoS has a small uncertainty and a softer behavior at high densities without the inclusion of extra degrees of freedom, which shows its potential to be used as an indicator for the component of NS core.
↳ astro-ph.HEnucl-thPRC(2024)·3 citations
06
Measurements of the lightest hypernucleus ( $_{Λ}^{3} H$ ): progress and perspective
Jinhui Chen🇨🇳 · Xin Dong🇺🇸 · Yu-Gang Ma🇨🇳 · Zhangbu Xu🇺🇸
The hyperon-nucleon ( $Y$ - $N$ ) interaction is important for the description of the equation-of-state of high baryon density matter. Hypernuclei, the cluster object of nucleons and hyperons, serve as cornerstones of a full understanding of the $Y$ - $N$ interaction. Recent measurements of the lightest known hypernucleus, the hypertriton's ( $_{Λ}^{3} H$ ) and anti-hypertriton's ( $_{Λ ˉ}^{3} H ˉ$ ) lifetime, mass and $Λ$ separation energy have attracted interests on the subject. Its cross section and collective flow parameters have also been measured in heavy-ion collisions, which have revealed new features on its production mechanism. In this article we summarise recent measurements of $_{Λ}^{3} H$ , focusing on the heavy-ion collisions. We will discuss their implications for the $_{Λ}^{3} H$ properties and the constrains on the $Y$ - $N$ interaction models.
↳ nucl-exnucl-thSci.Bull.(2023)·39 citations
07
Speed of sound and polytropic index in QCD matter
He Liu🇨🇳 · Yong-Hang Yang🇨🇳 · Chi Yuan🇨🇳 · Min Ju🇨🇳 · Xu-Hao Wu🇨🇳 · Peng-Cheng Chu🇨🇳
We investigate the speed of sound and polytropic index of quantum chromodynamics (QCD) matter in the full phase diagram based on a 3-flavor Polyakov-looped Nambu-Jona-Lasinio (pNJL) model. The speed of sound and polytropic index in isothermal and adiabatic cases all have a dip structure at the low chemical potential side of the chiral phase transition boundary, and these quantities reach their global minimum values at the critical endpoint (CEP) but are not completely zero, where the values in adiabatic are lightly greater than those in isothermal. Different from the speed of sound, the polytropic index also exists a peak around the chiral phase transition boundary. Along the hypothetical chemical freeze-out lines, the speed of sound rapidly decreases near the CEP, followed by a small spinodal behavior, while the polytropic index, especially in isothermal, exhibits a more pronounced and nearly closed to zero dip structure as it approaches the CEP.
↳ hep-phnucl-thPRD(2024)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE

PSR J0952−0607 and GW170817: Direct Multimessenger Constraints on Neutron Star Equation of State through a Novel Wide-ranging Correlation

Measurements of the lightest hypernucleus (Λ3​H): progress and perspective

Speed of sound and polytropic index in QCD matter

Affiliations

PSR J $0952 - 0607$ and GW170817: Direct Multimessenger Constraints on Neutron Star Equation of State through a Novel Wide-ranging Correlation

Measurements of the lightest hypernucleus ( $_{Λ}^{3} H$ ): progress and perspective