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Steep inflation: ending braneworld inflation by gravitational particle production

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posted on 2023-06-08, 07:45 authored by Edmund J Copeland, Andrew R Liddle, James E Lidsey
We propose a scenario for inflation based upon the braneworld picture, in which high-energy corrections to the Friedmann equation permit inflation to take place with potentials ordinarily too steep to sustain it. Inflation ends when the braneworld corrections begin to lose their dominance. Reheating may naturally be brought about via gravitational particle production, rather than the usual inflaton decay mechanism; the reheat temperature may be low enough to satisfy the gravitino bound and the Universe becomes radiation dominated early enough for nucleosynthesis. We illustrate the idea by considering steep exponential potentials, and show they can give satisfactory density perturbations (both amplitude and slope) and reheat successfully. The scalar field may survive to the present epoch without violating observational bounds, and could be invoked in the quintessential inflation scenario of Peebles and Vilenkin.

History

Publication status

  • Published

File Version

  • Published version

Journal

Physical Review D

ISSN

1550-2368

Issue

2

Volume

D64

Page range

0235091-5

Pages

5.0

Department affiliated with

  • Physics and Astronomy Publications

Notes

Equal collaboration of three co-authors. Discovered and analyzed a new mechanism for early Universe inflation to take place in fundamental physics scenarios, subsequently widely used. Over 140 citations (SPIRES).

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

First Open Access (FOA) Date

2016-03-22

First Compliant Deposit (FCD) Date

2016-11-17

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