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2016

A Unified Universe

Codello, Alessandro, Jain, Rajeev Kumar

Understand

We present a unified evolution of the universe from very early times until the present epoch by including both the leading local correction $R^2$ and the leading non-local term $R\frac{1}{\square^2}R$ to the classical gravitational action.

We find that the inflationary phase driven by $R^2$ term gracefully exits in a transitory regime characterized by coherent oscillations of the Hubble parameter.
The universe then naturally enters into a radiation dominated epoch followed by a matter dominated era.
At sufficiently late times after radiation-matter equality, the non-local term starts to dominate inducing an accelerated expansion of the universe at the present epoch.

Built on

A. A. Starobinsky, Phys. Lett. B91
1980
Earlier work this paper cites.
A. H. Guth, Phys. Rev. D23
1981
Earlier work this paper cites.
V. F. Mukhanov and G. V. Chibisov, JETP Lett. 33
1981
Earlier work this paper cites.
A. A. Starobinsky, Sov. Astron. Lett. 9
1983
Earlier work this paper cites.
J. F. Donoghue, Phys.Rev. D50
1994
Earlier work this paper cites.
A. G. Riess et al. (Supernova Search Team), Astron. J. 116
1998
Earlier work this paper cites.
S. Perlmutter et al. (Supernova Cosmology Project), Astrophys. J. 517
1999
Earlier work this paper cites.
P. J. E. Peebles and B. Ratra, Rev. Mod. Phys. 75
2003
Earlier work this paper cites.
C. Burgess, Living Rev.Rel. 7
2004
Earlier work this paper cites.
D. Espriu, T. Multamaki, and E. C. Vagenas, Phys. Lett. B628
2005
Earlier work this paper cites.
S. Deser and R. P. Woodard, Phys. Rev. Lett. 99
Original
2007
Earlier work this paper cites.
S. Nojiri and S. D. Odintsov, Phys. Lett. B659
Original
2008
Earlier work this paper cites.