Mass-radius constraints for compact stars and a critical endpoint (CROSBI ID 615837)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Blaschke, David ; Alvarez Castillo, David Edwin ; Benić, Sanjin
engleski
Mass-radius constraints for compact stars and a critical endpoint
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.
Third family of compact stars; critical point; QCD phase transition
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Podaci o prilogu
2013.
objavljeno
Podaci o matičnoj publikaciji
Podaci o skupu
Critical Point and Onset of Deconfinement
predavanje
11.03.2013-15.03.2013
Napa (CA), Sjedinjene Američke Države