Post-inflationary GW production in generic higher (infinite) derivative gravity
Alexey S. Koshelev, Alexei A. Starobinsky, Anna Tokareva
Abstract
Gravity can be embedded into a renormalizable theory by means of adding quadratic in curvature terms. However, this at first leads to the presence of the Weyl ghost. It is possible to get rid of this ghost if the locality assumption is weakened and the propagator of the graviton is represented by an entire function of the d'Alembertian operator without new poles and zeros. Models of this type admit a cosmological solution describing the R2, or Starobinsky, inflation. We study graviton production after inflation in this model and show that it is negligible despite the presence of the higher derivative operators which could potentially cause instabilities.
Topics & Concepts
GravitonInflation (cosmology)PropagatorPhysicsCurvatureMathematical physicsOperator (biology)Theoretical physicsDerivative (finance)Massive gravityFunction (biology)GravitationQuadratic equationClassical mechanicsMathematicsGeometryEconomicsRepressorTranscription factorBiologyBiochemistryGeneEvolutionary biologyChemistryFinancial economicsCosmology and Gravitation TheoriesBlack Holes and Theoretical PhysicsGeophysics and Gravity Measurements