Naslov
Mass-radius constraints for compact stars and a critical endpoint

Autori
Blaschke, David ; Alvarez Castillo, David Edwin ; Benić, Sanjin

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
PoS CPOD 2013 / - , 2013

Skup
Critical Point and Onset of Deconfinement

Mjesto i datum
Napa (CA), Sjedinjene Američke Države, 11.03.2013. - 15.03.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Third family of compact stars; critical point; QCD phase transition

Sažetak
We present two types of models for hybrid compact stars composed of a quark core and a hadronic mantle with an abrupt first order phase transition at the interface which are in accordance with the latest astrophysical measurements of two 2 M_sun pulsars. While the first is a schematic one, the second one is based on a QCD motivated nonlocal PNJL model with density-dependent vector coupling strength. Both models support the possibility of so called twin compact stars which have the same mass but different radius and internal structure at high mass (~2 M_sun), provided they exhibit a large jump \Delta \epsilon in the energy density of the first order phase transition fulfilling \Delta \epsilon/\epsilon_crit > 0.6. We conclude that the measurement of high-mass twin stars would support the existence of a first order phase transition in symmetric matter at zero temperature entailing the existence of a critical end point in the QCD phase diagram.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA