Superfluidity of Σ- hyperons in β-stable neutron star matter
Isaac Vidana, Laura Tolos
Abstract
In this work we evaluate the 1S0 energy gap of Σ- hyperons in β-stable neutron star matter. We solve the BCS gap equation for an effective Σ-Σ- pairing interaction derived from the most recent parametrization of the hyperon-hyperon interaction constructed by the Nijmegen group. We find that the Σ- hyperons are in a 1S0 superfluid state in the density region 0.27-0.7 fm-3, with a maximum energy gap of order 8 MeV at a total baryon number density of 0.37 fm-3 and a Σ- fraction of about 8%. We examine the implications on neutron star cooling.
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