Sound modes and instabilities in a relativistic superfluid

Mar 25, 2014, 5:00 PM


Andreas Schmitt (Vienna University of Technology)


Compact stars are likely to contain superfluid matter, either in the form of nuclear or quark matter, or both. The hydrodynamics of superfluids is usually described in terms of a two-fluid model. I will discuss how such a two-fluid model can be derived from field theory and apply the results to compute the properties of first and second sound for arbitrary temperatures and (uniform) superfluid velocities. I will also discuss the two-stream instability - known from plasma physics - that manifests itself in an unstable sound mode and that is potentially relevant for the fluid dynamics in the interior of the star.

Primary author

Andreas Schmitt (Vienna University of Technology)

Presentation materials