Neutron Star Physics and Monopole Flux Limits
Stringent bounds on the galactic monopole flux have been derived using monopole catalysis of nucleon decay inside neutron stars.1 Currently the most stringent limit comes from the pulsar PSR 1929+10 with the inclusion of monopole capture by the precursor main sequence star.2 This limit is FM < 10−28 cm−2 s−1 sr−1 assuming a strong interaction catalysis cross section. If this bound is correct then such monopoles are very rare indeed and detecting them will be virtually impossible. It is therefore of utmost importance to examine these catalysis bounds for possible loopholes. One possibility is that there are uncertainties in the observations of neutron star X-ray luminosities1 or in the calculations of monopole catalysis of nucleon decay. Another possibility is that something happens to the monopoles once they enter the neutron star that invalidates the catalysis bounds. I will focus on this latter possibility in my talk. Since neutron stars are complicated objects which are imperfectly understood, I will rely mainly on order of magnitude estimates and qualitative arguments and attempt to indicate where these may go wrong. A more detailed analysis will be presented in Ref. 3. I will give a brief review of the relevant properties of neutron stars.
KeywordsNeutron Star Flux Tube Magnetic Monopole Core Field Surface Magnetic Field
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