Axion Mass Limits from Cooling Neutron Stars

Details Axion Mass Limits from Cooling Neutron Stars Axion Mass Limits from Cooling Neutron Stars

1998-06-25

arxiv.org/abs/astro-ph/9806337v1

Astronomy and Astrophysics

Astrophysics

1 PostScript file, Proceedings of the Symposium (17-20 November 1997, Tokyo) ``Neutron Stars and Pulsars'' eds. N. Shibazaki e

Scientific paper

The thermal evolution of a neutron star is studied by including the energy loss due to axion emission. Two axion models and three types of neutron-star matter equation of state are used with the effects of nucleon superfluidity properly taken into account. In comparison with the observational data of PSR0656+14 from ROSAT, the upper limits on the axion mass are found to be $m_a < 0.06 - 0.3$ eV and 0.08$ -$ 0.8 eV for the KSVZ and DFSZ axion models, respectively, with the soft equation of state giving the most stringent limits.

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