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Nuclear Theory·nucl-th

Friday·June 24, 2022

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 06

    Equation of state for hot hyperonic neutron star matter

    Hristijan Kochankovski🇪🇸 · Angels Ramos🇪🇸 · Laura Tolos🇪🇸

    The FSU2H equation-of-state model, originally developed to describe cold neutron star matter with hyperonic cores, is extended to finite temperature. Results are presented for a wide range of temperatures and lepton fractions, which cover the conditions met in protoneutron star matter, neutron star mergers and supernova explosions. It is found that the temperature effects on the thermodynamical observables and the composition of the neutron star core are stronger when the hyperonic degrees of freedom are considered. An evaluation of the temperature and density dependence of the thermal index leads to the observation that the so-called law, widely used in neutron star merger simulations, is not appropriate to reproduce the true thermal effects, specially when hyperons start to be abundant in the neutron star core. To make finite temperature equations of state easily accessible, simple parameterizations of the thermal index for nucleonic and hyperonic -stable neutrino-free matter are provided.

    ↳ astro-ph.HEnucl-thMNRAS(2022)·41 citations
  2. 07

    Sensitivity of Neutron Star Observations to Three-nucleon Forces

    Andrea Sabatucci🇮🇹 · Omar Benhar🇮🇹 · Andrea Maselli🇮🇹 · Costantino Pacilio🇮🇹

    Astrophysical observations of neutron stars have been widely used to infer the properties of the nuclear matter equation of state. Beside being a source of information on average properties of dense matter, however, the data provided by electromagnetic and gravitational wave (GW) facilities are reaching the accuracy needed to constrain, for the first time, nuclear dynamics in dense matter. In this work we assess the sensitivity of current and future neutron star observations to directly infer the strength of repulsive three-nucleon forces, which are key to determine the stiffness of the equation of state. Using a Bayesian approach we focus on the constraints that can be derived on three-body interactions from binary neutron star mergers observed by second and third-generation of gravitational wave interferometers. We consider both single and multiple observations. For current detectors at design sensitivity the analysis suggests that only low mass systems, with large signal-to-noise ratios (SNR), allow to reliably constrain the three-body forces. However, our results show that a single observation with a third-generation interferometer, such as the Einstein Telescope or Cosmic Explorer, will constrain the strength of the repulsive three-body potential with exquisite accuracy, turning third-generation GW detectors into new laboratories to study the nucleon dynamics.

    ↳ astro-ph.HEgr-qcnucl-thPRD(2022)·19 citations
  3. 08

    Shear-induced anomalous transport and charge asymmetry of triangular flow in heavy-ion collisions

    Matteo Buzzegoli🇺🇸 · Dmitri E. Kharzeev🇺🇸 · Yu-Chen Liu🇺🇸 · Shuzhe Shi🇺🇸 · Sergei A. Voloshin🇺🇸 · Ho-Ung Yee🇺🇸

    Chiral anomaly implies the existence of non-dissipative transport phenomena, such as the chiral magnetic effect. At second order in the derivative expansion, novel quantum transport phenomena emerge. In this paper, we focus on the anomalous transport driven by a combination of shear, vorticity and magnetic field. We find that the corresponding transport phenomena -- shear-induced chiral magnetic and chiral vortical effects (siCME and siCVE) -- induce characteristic charge correlations among the hadrons produced in heavy ion collisions. We propose the charge asymmetry of triangular flow as a signature of the anomalous transport, and estimate the strength of the signal, as well as the background, using hydrodynamical model simulations. We find that the signal-to-background ratio for the proposed observable is favorable for experimental detection.

    ↳ hep-phnucl-exnucl-thPRC(2022)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE