Superfluidity in Disordered Neutron Star Crusts
J. A. Sauls, N. Chamel and M. A. Alpar
- Address: Center for Applied Physics & Superconducting Technologies,
Department of Physics, Northwestern University, Evanston, IL 60208
- Date: January 27, 2020
Physical Review Letters (submitted) (2020)
Nonequilibrium conditions imposed by neutrino cooling through the liquid-solid transition lead to disorder in the solid crust of neutron stars. Disorder reduces the superfluid fraction, ρs/ρ, at densities above that of neutron drip, ρd ≈ 4×1011 g/cm3. For an amorphous solid crust the suppression of ρs is small, except in the highest density regions of the crust. In contrast to the strong reduction in neutron conduction predicted for coherent Bragg scattering in a crystalline crust, the disordered solid crust supports sufficient neutron superfluid density to account for pulsar glitches.
- Comment: 6 pages, 5 figures