A one-loop functional derivation gives the local effective action and FLRW energy-momentum tensor for a scalar-channel NJL condensate in curved spacetime, reproducing flat-space mean-field results in the constant-condensate limit.
Superconducting loop quantum gravity and the cosmological constant
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We argue that the cosmological constant is exponentially suppressed in a candidate ground state of loop quantum gravity as a nonperturbative effect of a holographic Fermi-liquid theory living on a two-dimensional spacetime. Ashtekar connection components, corresponding to degenerate gravitational configurations breaking large gauge invariance and CP symmetry, behave as composite fermions that condense as in Bardeen-Cooper-Schrieffer theory of superconductivity. Cooper pairs admit a description as wormholes on a de Sitter boundary.
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Four-Fermion Condensates in Curved Spacetimes: A Functional Approach
A one-loop functional derivation gives the local effective action and FLRW energy-momentum tensor for a scalar-channel NJL condensate in curved spacetime, reproducing flat-space mean-field results in the constant-condensate limit.