Yan Liu, Koenraad Schalm, Ya-Wen Sun, Jan Zaanen
We study the holographic dual of a finite density system with both bosonic and fermionic degrees of freedom. There is no evidence for a universal bose-dominated ground state. Instead, depending on the relative conformal weights the preferred groundstate is either pure AdS-Reissner-Nordstrom, a holographic superconductor, an electron star, or a novel mixed state that is best characterized as a hairy electron star.
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http://arxiv.org/abs/1307.4572
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