http://arxiv.org/abs/1507.07087
In this work we consider how the appearance of pseudoscalar condensates in a star may possibly influence its cooling rate and other properties. We make no particular assumption on the origin and characteristics of these possible condensates; they can origin from a large concentration of axions or being due to more traditional pion-like condensates in compact neutron stars. We adopt the hypothesis that in regions where the pseudoscalar density gradient is large the properties of photons and fermions are governed by the usual Lagrangian extended with a Chern-Simons interaction for photons and a constant axial field for fermions. We find that these new interactions produce non-trivial reflection coefficients both for photons and fermions in regions where the pseudoscalar has a non-zero gradient. A varying pseudoscalar density may also lead to fermion instability and modify some properties of the Fermi sea. We speculate that some of these modifications could not only influence the star cooling rate but also have remarkable observable consequences. While quantitative results may depend on precise astrophysical details, most of the consequences are quite universal and consideration should be given to this possibility.
A. Andrianov, V. Andrianov, D. Espriu, et. al.
Tue, 28 Jul 15
35/70
Comments: 21 pages,8 figures
You must be logged in to post a comment.