Stellar spectroscopy: Fermions and holographic Lifshitz criticality

Understand

Electron stars are fluids of charged fermions in Anti-de Sitter spacetime.

• They are candidate holographic duals for gauge theories at finite charge density and exhibit emergent Lifshitz scaling at low energies.
• This paper computes in detail the field theory Green's function G^R(w,k) of the gauge-invariant fermionic operators making up the star.
• The Green's function contains a large number of closely spaced Fermi surfaces, the volumes of which add up to the total charge density in accordance with the Luttinger count.