English

Scale invariance and a gravitational model with non-eternal inflation

High Energy Physics - Theory 2015-05-30 v2 Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology

Abstract

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.

Keywords

Cite

@article{arxiv.1109.1468,
  title  = {Scale invariance and a gravitational model with non-eternal inflation},
  author = {Carlos Herdeiro and Shinji Hirano},
  journal= {arXiv preprint arXiv:1109.1468},
  year   = {2015}
}

Comments

13 pages, 4 figures; revised version accepted in JCAP