title: Constraining hadronic superfluidity with neutron star precession.
abstract: I show that the standard picture of the neutron star core containing coexisting neutron and proton superfluids, with the proton component forming a type II superconductor threaded by flux tubes, is inconsistent with observations of long-period (approximately 1 yr) precession in isolated pulsars. I conclude that either the two superfluids coexist nowhere in the stellar core, or the core is a type I superconductor rather than type II. Either possibility would have interesting implications for neutron star cooling and theories of spin jumps (glitches).
authors.affiliation: Department of Physics, Montana State University, Bozeman, Montana 59717, USA.
authors.forename: Bennett
authors.initials: B
authors.lastname: Link