/ nucl-th arXiv:1310.3803

Mass-radius constraints for compact stars and a critical endpoint

Blaschke, David (Dubna, JINR) ; Alvarez-Castillo, David E. (San Luis Potosi U.) ; Benic, Sanjin (Zagreb U., Phys. Dept.)

Pages: 7

Abstract: 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.

Web-Page: http://inspirehep.net/record/1258374/files/EoS-reTwins_APR_1.png; http://inspirehep.net/record/1258374/files/EoS-reTwins_APR_2.png; http://inspirehep.net/record/1258374/files/MvsR-reTwins_1.png; http://inspirehep.net/record/1258374/files/MvsR-reTwins_2.png; http://inspirehep.net/record/1258374/files/arXiv:1310.3803.pdf

Note: 7 pages, 2 figures, 1 table, prepared for the Proceedings of the 8th International Workshop on "Critical Point and Onset of Deconfinement",March 11 to 15, 2013, Napa, California, USA

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 Record created 2013-11-11, last modified 2014-01-30

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