Topics in Neutron Star Physics
Topics in Neutron Star Physics
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Date
2015
Authors
Sen, Srimoyee
Advisor
Bedaque, Paulo F
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Abstract
This dissertation explores the properties of neutron matter for baryon chemi-
cal potential of the order of a hundred MeV in the context of neutron star interior.
Neutron stars are known to be cold (< 10^9 K) dense objects composed mostly
of neutrons with densities of the outer core reaching 1013 g/cc to 1014 g/cc. For
such densities neutron matter is speculated to form a superfluid condensate in the
triplet channel of angular momentum. The implication of this superfluidity for the
transport properties of the core of a neutron star is dramatic as the neutrons get
gapped leading to a Boltzmann suppression in most observables at low temperature
and the low energy properties of the system is dictated by ungapped low energy
modes. The first part of the thesis discusses the effective theory of the low energy
modes of triplet neutron matter. We also derive the masses of the slightly high
lying massive modes as a function of temperature. This is followed by a calculation
of neutrino emissivity of the Goldstone modes in the presence of realistic magnetic
fields in magnetars.