PoS - Proceedings of Science
Volume 262 - The Modern Physics of Compact Stars 2015 (MPCS2015) - Session i nuclear physics of compact stars
Interplay between Symmetry Energy and Excluded Volume Corrections under the Direct Urca Cooling Constraint in Neutron Stars
D.E. Alvarez Castillo* and D. Blaschke
Full text: pdf
Published on: December 30, 2016
Both the symmetry energy part and excluded volume corrections to the equation of state play an
important role for the neutron star interior structure and composition, namely for the profile of
the baryon density and the proton fraction. While the symmetry energy uniquely determines the
proton fraction, excluded volume effects control the maximum density values inside neutron stars.
Observations of cooling neutron stars indicate that the fast direct Urca cooling is not operative for
the typical, low mass stars, pointing at proton fractions that lie below the threshold for the onset
of direct Urca cooling process. This in turn, restricts the density range admissible in neutron
star interiors and may require an excluded volume correction. In this contribution we discuss the
interplay between fast cooling, symmetry energy and excluded volume corrections to the equation
of state that would be required to fulfill the direct Urca cooling constraint.
DOI: https://doi.org/10.22323/1.262.0026
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