# Bayesian analysis for a new class of hybrid EoS models using mass and radius data of compact stars

## TL;DR

This paper uses Bayesian analysis to evaluate hybrid star models with two-phase equations of state, showing that observing high-mass twin stars could confirm a strong phase transition and reveal a critical endpoint in QCD.

## Contribution

It introduces a Bayesian framework to distinguish hybrid EoS models with strong phase transitions using mass and radius data of compact stars.

## Key findings

- High-mass twin stars can discriminate between different EoS models.
- Observation of twin stars supports the existence of a critical endpoint in QCD.
- Bayesian analysis enhances understanding of dense matter in neutron stars.

## Abstract

We present a Bayesian analysis for a new class of realistic models of two-phase equations of state (EoS) for hybrid stars and demonstrate that the observation of a pair of high-mass twin stars would have a sufficient discriminating power to favor hybrid EoS with a strong first order phase transition over alternative EoS. Such a measurement would provide evidence for the existence of a critical endpoint in the QCD phase diagram.