Origin of density fluctuations in extended inflation

Technical Report · Tue May 01 04:00:00 EDT 1990

OSTI ID:6507262

Kolb, E W; Salopek, D S; Turner, M S

The density fluctuations (both curvature and isocurvature) that arise due to quantum fluctuations in a simple model of extended inflation based upon the Jordan-Brans-Dicke theory are calculated. Curvature fluctuations arise due to quantum fluctuations in the Brans-Dicke field, in general have a nonscale-invariant spectrum, and can have an amplitude that is cosmologically acceptable and interesting without having to tune any coupling constant to a very small value. The density perturbations that arise due to the inflation field are subdominant. If there are other massless fields in the theory, e.g., an axion or an ilion, then isocurvature fluctuations arise in these fields too. Production of gravitational waves and the massless particles associated with excitations of the Brans-Dicke field are also discussed. Several attempts at more realistic models of extended inflation are also analyzed. The importance of the Einstein conformal frame in calculating curvature fluctuations is emphasized. When viewed in this frame, extended inflation closely resembles slow-rollover inflation with an exponential potential and the usual formula for the amplitude of curvature perturbations applies.

• Research Organization: Fermi National Accelerator Lab., Batavia, IL (USA)
• OSTI ID: 6507262
• Report Number(s): N-90-25915; NASA-CR--182852; NAS--1.26:182852; FERMILAB-PUB--90/116-A
• Country of Publication: United States
• Language: English

Related Subjects

640106* -- Astrophysics & Cosmology-- Cosmology
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMOLOGICAL MODELS
DATA
DENSITY
DISTURBANCES
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUCTUATIONS
GRAVITATIONAL WAVES
INFORMATION
MATHEMATICAL MODELS
NUMERICAL DATA
PHYSICAL PROPERTIES
SYMMETRY BREAKING
THEORETICAL DATA
VARIATIONS