Abstract
We study the sound modes of a Bose–Fermi mixture superfluid at finite temperatures in the collisional hydrodynamic regime. We extend Landau’s hydrodynamic theory to deal with a Bose–Fermi mixture superfluid and show the existence of three sound modes. We calculate the hydrodynamic sound velocities numerically using the Nozieres and Schmitt-Rink theory at unitarity. The three-sound-modes hybrid in Bose–Fermi mixture superfluids contrasts with the two sound modes exhibited by 3He and 4He superfluids.
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