Anisotropically Inflating Universes

Details Anisotropically Inflating Universes Anisotropically Inflating Universes

2005-11-23

arxiv.org/abs/gr-qc/0511127v3

Phys.Rev. D73 (2006) 023007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages, further discussion and references added

Scientific paper

10.1103/PhysRevD.73.023007

We show that in theories of gravity that add quadratic curvature invariants to the Einstein-Hilbert action there exist expanding vacuum cosmologies with positive cosmological constant which do not approach the de Sitter universe. Exact solutions are found which inflate anisotropically. This behaviour is driven by the Ricci curvature invariant and has no counterpart in the general relativistic limit. These examples show that the cosmic no-hair theorem does not hold in these higher-order extensions of general relativity and raises new questions about the ubiquity of inflation in the very early universe and the thermodynamics of gravitational fields.

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