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HK: Fachverband Physik der Hadronen und Kerne

HK 62: Nukleare Astrophysik

HK 62.4: Talk

Friday, March 21, 2014, 15:00–15:15, HZ 5

Broken Superfluid in Dense Quark Matter — •Denis Parganlija¹, Andreas Schmitt¹, and Mark Alford² — ¹Institut für Theoretische Physik, Technische Universität Wien, 1040 Vienna, Austria — ²Department of Physics, Washington University St Louis, MO, 63130, USA

Quark matter at high densities is a superfluid. Properties of the superfluid become highly non-trivial if the effects of strange-quark mass and the weak interactions are considered. These properties are relevant for a microspic description of compact stars.
We discuss the effect of a (small) explicitly symmetry-breaking term on the properties of a zero-temperature superfluid in a relativistic φ⁴ theory. If the U(1) symmetry is exact, chemical potential and superflow can be equivalently introduced either via (1) a background gauge field or (2) a topologically nontrivial mode. However, in the case of the explicitly broken symmetry, we demonstrate that the scenarios (1) and (2) lead to quantitatively different results for the mass of the pseudo-Goldstone mode and the critical velocity for superfluidity.