Gravitational waves from p-form inflation
Mar, 20099 pages
Published in:
- JCAP 05 (2009) 004
e-Print:
- 0903.2769 [astro-ph.CO]
Report number:
- WU-AP-297-09
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Abstract: (arXiv)
Recently it was shown that an inflationary background can be realized by any -form field non-minimally coupled to gravity. In this paper, we study gravitational waves generated during p-form inflation. Even though the background evolution is identical to that in conventional scalar field inflation, the behavior of gravitational waves is different in p-form inflation. In particular, we find that the propagation speed of gravitational waves differs from unity in 2- and 3-form inflationary models. We point out that the squared speed becomes negative in the large field models. The small field models are free from pathologies and the correction to the spectrum of gravitational waves turns out to be very small.Note:
- 9 pages
- 98.80.Cq
- gravitational radiation: spectra
- field theory: scalar
- inflation
- differential forms
- gravitational radiation: velocity
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