Tue, Oct 12, 2010, 12:40 pm to 2:00 pm
Speaker: Patrick Kerner (Max-Planck-Institute Munich, MPI) Title: Quantum Phase Transitions in holographic Superfluids at finite baryon and isospin chemical potentials Abstract: We discuss holographic duals of strongly interacting gauge theories which show properties of p-wave superfluids which in addition to an Abelian symmetry also break the spatial rotational symmetry. The gravity duals of these superfluid states are black hole solutions with a vector hair which we construct in back-reacted U(2) Einstein-Yang-Mills theory and in the D3/D7 brane setup with two coincident D7-brane probes. The latter allows us to identify the dual field theory explicitly. We introduce two chemical potentials: the baryon chemical potential corresponding to the overall U(1) and the isospin chemical potential corresponding to a diagonal U(1) of SU(2). Studying the phase diagram we find in both systems a quantum phase transition at a critical ratio of the baryon to isospin chemical potential.