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Implementation of the Nambu Jona-Lasinio model in hybrid stars

Benhar, O and Cipollone, A (2011) Implementation of the Nambu Jona-Lasinio model in hybrid stars Astronomy and Astrophysics, 525 (13).

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Abstract

The model of Nambu and Jona-Lasinio has been extensively used to model the possible occurrence of quark matter in the core of compact stars. While based entirely on similar physical assumptions, previous studies have been performed using a variety of model versions, differing in both the number of active quark flavors and the structure of the quark-quark interaction. We discuss the results of our systematic analysis, designed to clarify the role of the vector and instanton-induced interactions in determining the properties of hybrid stars. The results of our calculations, carried out using a state-of-the-art description of the hadronic phase, show that the instanton-induced interaction does not affect the stiffness of the quark matter equation of state, whereas the effect of the repulsive vector interaction is sizable. However, no values of the corresponding coupling constants allow for the formation of a stable core of quark matter. © 2010 ESO.

Item Type: Article
Authors :
NameEmailORCID
Benhar, OUNSPECIFIEDUNSPECIFIED
Cipollone, Aandrea.cipollone@surrey.ac.ukUNSPECIFIED
Date : 1 January 2011
Identification Number : https://doi.org/10.1051/0004-6361/201015686
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:35
Last Modified : 17 May 2017 12:35
URI: http://epubs.surrey.ac.uk/id/eprint/835965

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