# The Modern Physics of Compact Stars and Relativistic Gravity 2021

Sep 27 – 30, 2021
Yerevan, Armenia
Etc/GMT+4 timezone

## The neutron star equation of state under new constraints

Sep 28, 2021, 3:35 PM
25m
Yerevan, Armenia

#### Yerevan, Armenia

Department of Physics, Alex Manukyan str. 1, Yerevan, Armenia

### Speaker

Dr David Edwin Alvarez Castillo (JINR)

### Description

Recent constraints from neutron star measurements and nuclear experiments have narrowed the allowed physical regions for the compact stars equation of state (EoS) resulting in some of the well established models being less probable than before. These new constraints include the NICER mass-radius measurement of the object PSR J0740+6620, whereas laboratory experiments like Spectral Pion Ratio by Radioactive Ion Beams (SπRIT Collaboration) and parity-violating asymmetry in the elastic scattering of longitudinally polarized electrons from $^{208}$Pb (PREX collaboration) have reported values of the slope of the nuclear symmetry energy at saturation, a quantity strongly correlated to the neutron star radius. In this talk I will review mostly EoS models of hadronic and hybrid stars, and will present the results of a Bayesian Analysis that includes the state-of-the-art astrophysical constraints in order to select the most probable EoS parameters.

### Primary authors

Alexander Ayriyan (JINR & AANL) David Blaschke (University of Wroclaw) Dr David Edwin Alvarez Castillo (JINR)