Inflation - Predictions and constraints Kate Land.

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Presentation transcript:

Inflation - Predictions and constraints Kate Land

Simple model

General properties cf: Planck scale ~ GeV GUT ~ GeV (r ~ ) Current constraint V 1/4 < 2.6 x GeV Bpol limitV 1/4 > 6 x GeV Lyth bound

Models Small field (from symmetry breaking models) Large field (from chaotic initial conditions) Hybrid (more than one field) Tegmark et al. astro-ph/ Tegmark et al. astro-ph/

Kinney et al. astro-ph/

Simplicity? Boyle, Steinhardt, Turok astro-ph/

Initial conditions Linde hep-th/ ‘Natural’ to expect large V Large friction term

Other options Eternal inflation What are the predictions? Can start anytime and then will dominate DBI/Brane-inflation (Bean et al. 2007, Lidsey & Seery 2007) Different consistency relation High f NL OR r Ekpyrotic No gravitational waves Unexpected features (glitches) Cosmic strings

Discussion A detection of r would be incompatible with current supersymmetry models + particle physics theory Arguments based on ‘simplicity’ and ‘naturalness’ predict it detectable WMAP3 tentatively favours detectable r (?!) Brane cosmology is making predictions we could probe Gravitational waves is the NEXT confrontation of inflation Dischord cannot be settled another way!!