Relaxing the TCC bound on inflationary cosmology?
Vahid Kamali, Robert Brandenberger
Abstract
We demonstrate that the strict upper bounds on the energy scale of inflation and on the tensor-to-scalar ratio can be somewhat relaxed if we assume that - after an initial period of slow rolling when scales probed today in CMB experiments exit the Hubble radius - the equation of state of the background changes to correspond to an almost marginally accelerating universe. Constructing an actual model in which this happens appears, however, to be unnatural.
Topics & Concepts
PhysicsInflation (cosmology)Slow rollCosmic microwave backgroundUpper and lower boundsHubble's lawScale (ratio)RADIUSEnergy (signal processing)Scale factor (cosmology)AccelerationState (computer science)Theoretical physicsHubble volumeStatistical physicsEquation of stateScalingWork (physics)Classical mechanicsScale invarianceMathematical physicsCosmologyMeasure (data warehouse)Cosmology and Gravitation TheoriesGalaxies: Formation, Evolution, PhenomenaParticle physics theoretical and experimental studies