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Gauss-Bonnet Inflation

Panagiota Kanti
(
- Ioannina U. and
- Athens U.
)
,
Radouane Gannouji
(
- Valparaiso U., Catolica
)
,
Naresh Dadhich
(
- Jamia Millia Islamia and
- IUCAA, Pune
)

Mar 5, 2015

5 pages

Published in:

Phys.Rev.D 92 (2015) 4, 041302

Published: Aug 24, 2015

e-Print:

1503.01579 [hep-th]

DOI:

10.1103/PhysRevD.92.041302

View in:

ADS Abstract Service

reference search156 citations

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Abstract: (APS)

We consider an Einstein-scalar-Gauss-Bonnet gravitational theory, and argue that at early times the Ricci scalar can be safely ignored. We then demonstrate that the pure scalar-Gauss-Bonnet theory, with a quadratic coupling function, naturally supports inflationary—de Sitter—solutions. During inflation, the scalar field decays exponentially and its effective potential remains always bounded. The theory also contains solutions where these de Sitter phases possess a natural exit mechanism and are replaced by linearly expanding—Milne—phases.

Note:

6 pages, Revtex, 3 figures, introduction updated, a section added, typos corrected, accepted as a Rapid Communications article in Physical Review D

98.80.Cq
04.50.Kd
98.80.-k
inflation
Gauss-Bonnet term
scalar: Ricci
field theory: scalar
Milne
de Sitter
effective potential

References(17)

Figures(4)

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