Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ara..conf...65m&link_type=abstract
ASTRONOMY AND RELATIVISTIC ASTROPHYSICS New Phenomena and New States of Matter in the Universe. Proceedings of the Third Worksho
Astronomy and Astrophysics
Astrophysics
Isovector Scalar Meson, High Density Hadronic Systems, Neutron Stars, Protoneutron Stars Cooling
Scientific paper
A recently developed relativistic theory for nuclear matter is applied to the description of the cooling process of neutron stars through neutrino emission in the so called direct URCA process in baryon degenerated matter. The results of our calculations show that the threshold for the URCA process decreases when scalar-isovector mesons are considered into the formalism. This occurs because these mesons increase the proportion of protons in nuclear matter, that is, they increase the value of the Fermi momentum of the protons to the extent they reduce the asymmetry of isospin in nuclear matter. Our results also indicate that neutron stars with larger masses than MNE ~ 0.9M&sun;, which represents the stellar critical threshold (the mass of the neutron star whose baryon central density reached the critical density) would be cooled efficiently and be outside the possibility of detection by heat radiation in a few years.
Fernandez Francisco
Mesquita A. A.
Razeira M.
Vasconcellos Cesar A. Z.
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