Scale invariance and a gravitational model with non-eternal inflation
- Departamento de Física da Universidade de Aveiro and I3N, Campus de Santiago, 3810-183 Aveiro (Portugal)
- Department of Physics, Nagoya University, Nagoya 464-8602 (Japan)
We propose a 3+1 dimensional model of gravity which results in inflation at early times, followed by radiation- and matter-dominated epochs and a subsequent acceleration at late times. Both the inflation and late time acceleration are nearly de Sitter with a large hierarchy between the effective cosmological constants. There is no scalar field agent of inflation, and the transition from the inflation to the radiation-dominated period is smooth. This model is designed so that it yields, at the cost of giving up on Lorentz invariance in the gravitational sector, the Dirac-Born-Infeld type conformal scalar theory when the universe is conformally flat. It, however, resembles Einstein's gravity with the Gibbons-Hawking-York boundary term in weakly curved space-times.
- OSTI ID:
- 22279986
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 05 Vol. 2012; ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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