Non-metric chaotic inflation
Jul, 2011
7 pages
Published in:
- JCAP 05 (2012) 023
e-Print:
- 1107.3739 [astro-ph.CO]
Report number:
- HIP-2011-20-TH,
- ITP-UU-11-28,
- SPIN-11-21,
- TTK-11-25
View in:
Citations per year
Abstract: (arXiv)
We consider inflation within the context of what is arguably the simplest non-metric extension of Einstein gravity. There non-metricity is described by a single graviscalar field with a non-minimal kinetic coupling to the inflaton field , parameterized by a single parameter . We discuss the implications of non-metricity for chaotic inflation and find that it significantly alters the inflaton dynamics for field values , dramatically changing the qualitative behaviour in this regime. For potentials with a positive slope non-metricity imposes an upper bound on the possible number of e-folds. For chaotic inflation with a monomial potential, the spectral index and the tensor-to-scalar ratio receive small corrections dependent on the non-metricity parameter. We also argue that significant post-inflationary non-metricity may be generated.Note:
- 7 pages, 1 figure
- inflation: chaos
- power spectrum: scalar
- graviscalar
- gravitation
- power spectrum: tensor
- Palatini model
References(13)
Figures(2)