A late-accelerating universe with no dark energy - and a finite-temperature big bang

Details A late-accelerating universe with no dark energy - and a finite-temperature big bang A late-accelerating universe with no dark energy - and a finite-temperature big bang

2005-08-28

arxiv.org/abs/gr-qc/0508116v2

JCAP 0511 (2005) 008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

revised title and minor improvements, additional references; to appear JCAP

Scientific paper

10.1088/1475-7516/2005/11/008

Brane-world models offer the possibility of explaining the late acceleration of the universe via infra-red modifications to General Relativity, rather than a dark energy field. However, one also expects ultra-violet modifications to General Relativity, when high-energy stringy effects in the early universe begin to grow. We generalize the DGP brane-world model via an ultra-violet modification, in the form of a Gauss-Bonnet term in the bulk action. The combination of infra-red and ultra-violet modifications produces an intriguing cosmology. The DGP feature of late-time acceleration without dark energy is preserved, but there is an entirely new feature - there is no hot big bang in the early universe. The universe starts with finite density and pressure, from a "sudden" curvature singularity.

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