R2 inflation in anisotropic universes
Creators
- 1. Waseda University, Department of Physics, Okubo 3-4-1, Shinjuku-ku, Tokyo 169 (Japan)
- 2. Center for Relativity, Department of Physics, University of Texas at Austin, Austin, TX (USA)
Description
The evolution of Bianchi type-I and type-IX universes for a theory of gravity with an εR2 term added to the usual Lagrangian is considered. As in the spatially flat Robertson-Walker case considered previously by others, inflation is found to occur. For any amount of initial anisotropy, the anisotropy decays quickly relative to the length of the inflationary epoch, and the amount of expansion is enhanced by the anisotropy. The exceptions are Bianchi type-IX universes near or at isotropy. In these cases a wide range of initial parameters causes the universe to recollapse, thus reducing the phase space in which inflation can occur. The diagonal metric is shown to be the most general form in the R2 theory for both Bianchi type-I universes with a perfect fluid and vacuum Bianchi type-IX models
Additional details
Publishing Information
- Journal Title
- Physical Review, D
- Journal Volume
- 42
- Journal Issue
- 4
- Series
- Phys. Rev., D.
- Journal Page Range
- 1016-1022
- ISSN
- 0556-2821
- CODEN
- PRVDA
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 22011105
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Descriptors DEI
- ANISOTROPY; COSMOLOGICAL MODELS; EQUATIONS OF STATE; FIELD EQUATIONS; GRAVITATIONAL FIELDS; INFLATIONARY UNIVERSE; LAGRANGIAN FUNCTION; METRICS; PHASE SPACE; RICCI TENSOR; RIEMANN SPACE
- Descriptors DEC
- EQUATIONS; FUNCTIONS; MATHEMATICAL MODELS; MATHEMATICAL SPACE; SPACE; TENSORS