Perturbations of extended inflation

Details Perturbations of extended inflation Perturbations of extended inflation

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvd..45.3301d&link_type=abstract

Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 45, Issue 10, 15 May 1992, pp.R3301-R3303

Physics

14

Particle-Theory And Field-Theory Models Of The Early Universe, Gravity In More Than Four Dimensions, Kaluza-Klein Theory, Unified Field Theories, Alternative Theories Of Gravity

Scientific paper

Perturbing the metric, the inflaton (scalar matter) and the dilaton (Brans-Dicke scalar) of extended inflation, the Lagrangian of quadratic order for the two true, gauge-invariant degrees of freedom of the perturbations is derived. This result should allow a rigorous analysis of the initial spectrum of density fluctuations in all models of extended inflation (i.e., with self-interacting dilation field). As an immediate application we show that in the particular case of old extended inflation, where the inflaton is trapped at a false-vacuum local minimum of its potential, its fluctuation does not contribute to the density perturbation, thus confirming earlier approximate calculations.

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