Tensor to scalar ratio in nonminimal {phi}{sup 4} inflation
Journal Article
·
· Physical Review. D, Particles Fields
- Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487 (United States)
- Bartol Research Institute, Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States)
We reconsider nonminimal {lambda}{phi}{sup 4} chaotic inflation which includes the gravitational coupling term {xi}R{phi}{sup 2}, where {phi} denotes a gauge singlet inflaton field and R is the Ricci scalar. For {xi}>>1, we require, following recent discussions, that the energy scale {lambda}{sup 1/4}m{sub P}/{radical}({xi}) for inflation should not exceed the effective UV cutoff scale m{sub P}/{xi}, where m{sub P} denotes the reduced Planck scale. The predictions for the tensor-to-scalar ratio r and the scalar spectral index n{sub s} are found to lie within the Wilkinson Microwave Anisotropy Probe 1-{sigma} bounds for 10{sup -12} < or approx. {lambda} < or approx. 10{sup -4} and 10{sup -3} < or approx. {xi} < or approx. 10{sup 2}. In contrast, the corresponding predictions of minimal {lambda}{phi}{sup 4} chaotic inflation lie outside the Wilkinson Microwave Anisotropy Probe 2-{sigma} bounds. We also find that r > or approx. 0.002, provided the scalar spectral index n{sub s{>=}}0.96. In estimating the lower bound on r, we take into account possible modifications due to quantum corrections of the tree level inflationary potential.
- OSTI ID:
- 21420909
- Journal Information:
- Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 4 Vol. 82; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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