The EFT bootstrap at finite MPL
Carl Beadle, Giulia Isabella, Davide Perrone, Sergio Ricossa, Francesco Riva, Francesco Serra
Abstract
A bstract We explore the impact of loop effects on positivity in effective field theories emerging in the infrared from unitary and causal microscopic dynamics. Focusing on massless particles coupled to gravity, we address the treatment of forward-limit divergences from loop discontinuities and establish necessary conditions for maintaining computational control in perturbation theory. While loop effects remain small, ensuring consistency in our approach leads to a significant impact on bounds, even at tree level.
Topics & Concepts
PhysicsMassless particlePerturbation theory (quantum mechanics)Effective field theoryUnitary stateLoop (graph theory)Limit (mathematics)Classification of discontinuitiesTheoretical physicsStatistical physicsMathematical physicsQuantum electrodynamicsParticle physicsMathematical analysisMathematicsCombinatoricsPolitical scienceLawBlack Holes and Theoretical PhysicsCosmology and Gravitation TheoriesParticle physics theoretical and experimental studies