On natural inflation
Journal Article
·
· Physical Review. D, Particles Fields
- Michigan Center for Theoretical Physics, Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 (United States)
We reexamine the model of natural inflation, in which the inflaton potential is flat due to shift symmetries. The original version of the model, where the inflaton is a pseudo-Nambu-Goldstone boson with potential of the form V({phi})={lambda}{sup 4}[1{+-}cos({phi}/f)], is studied in light of recent data. We find that the model is alive and well. Successful inflation as well as data from the Wilkinson Microwave Anisotropy Probe require f>0.6m{sub Pl} (where m{sub Pl}=1.22x10{sup 19} GeV) and {lambda}{approx}m{sub GUT} (where m{sub GUT}{approx}10{sup 16} GeV), scales which can be accommodated in particle physics models. The detectability of tensor modes from natural inflation in upcoming microwave background experiments is discussed. We find that natural inflation predicts a tensor/scalar ratio within reach of future observations.
- OSTI ID:
- 20705446
- Journal Information:
- Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 8 Vol. 70; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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