Unitarity Bounds and RG Flows in Time Dependent Quantum Field Theory

Dong, Xi ; Horn, Bart ; Silverstein, Eva ; Torroba, Gonzalo ; /Stanford U., ITP /Stanford U., Phys. Dept. /SLAC

SLAC National Accelerator Laboratory

关键词: Holography;    Space-Time;    Dimensions;    Field Theories;    Quantum Field Theory;   

DOI  :  10.2172/1037997
RP-ID  :  SLAC-PUB-14882
RP-ID  :  AC02-76SF00515
RP-ID  :  1037997

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来源: UNT Digital Library

【 摘 要 】

We generalize unitarity bounds on operator dimensions in conformal field theory to field theories with spacetime dependent couplings. Below the energy scale of spacetime variation of the couplings, their evolution can strongly affect the physics, effectively shifting the infrared operator scaling and unitarity bounds determined from correlation functions in the theory. We analyze this explicitly for large-N double-trace flows, and connect these to UV complete field theories. One motivating class of examples comes from our previous work on FRW holography, where this effect explains the range of flavors allowed in the dual, time dependent, field theory.