PhysRevD.64.023509.pdf (50.17 kB)
Steep inflation: ending braneworld inflation by gravitational particle production
journal contribution
posted on 2023-06-08, 07:45 authored by Edmund J Copeland, Andrew R Liddle, James E LidseyWe 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.
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- Published
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- Published version
Journal
Physical Review DISSN
1550-2368External DOI
Issue
2Volume
D64Page range
0235091-5Pages
5.0Department 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
2012-02-06First Open Access (FOA) Date
2016-03-22First Compliant Deposit (FCD) Date
2016-11-17Usage metrics
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