Bounds on EFT’s in an expanding universe
Mariana Carrillo González
Abstract
We find bounds on the Wilson coefficients of effective field theories (EFTs) living in a universe undergoing expansion by requiring that its modes do not propagate further than a minimally coupled photon by a resolvable amount. To do so, we compute the spatial shift suffered by the EFT modes at a fixed time slice within the WKB approximation and the regime of validity of the EFT. We analyze the bounds arising on shift-symmetric scalars and curved space generalizations of Galileons. Published by the American Physical Society 2024
Topics & Concepts
WKB approximationPhysicsTheoretical physicsUniverseSpace (punctuation)Effective field theoryField (mathematics)Metric expansion of spacePhotonStatistical physicsMathematical physicsQuantum mechanicsMathematicsComputer scienceCosmologyPure mathematicsDark energyOperating systemCosmology and Gravitation TheoriesBlack Holes and Theoretical PhysicsPulsars and Gravitational Waves Research