Physical Running of Couplings in Quadratic Gravity
Diego Buccio, John F. Donoghue, Gabriel Menezes, Roberto Percacci
Abstract
We argue that the well-known beta functions of quadratic gravity do not correspond to the physical dependence of scattering amplitudes on external momenta, and derive the correct physical beta functions. Asymptotic freedom turns out to be compatible with the absence of tachyons.
Topics & Concepts
TachyonPhysicsQuadratic equationScattering amplitudeAmplitudeDegrees of freedom (physics and chemistry)BETA (programming language)Classical mechanicsMathematical physicsScatteringTheoretical physicsQuantum electrodynamicsQuantum mechanicsMathematicsComputer scienceProgramming languageGeometryCosmology and Gravitation TheoriesBlack Holes and Theoretical PhysicsParticle physics theoretical and experimental studies