期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 11, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP11(2012)042
关键词
Cosmology of Theories beyond the SM; Nonperturbative Effects
资金
- National Science Foundation [PHY-0969020]
- Texas Cosmology Center
- College of Natural Sciences
- Department of Astronomy at the University of Texas at Austin
- McDonald Observatory
- Direct For Mathematical & Physical Scien
- Division Of Physics [0969020, GRANTS:13786665] Funding Source: National Science Foundation
We consider the effects of fields with suddenly changing mass on the inflationary power spectra. In this context, when a field x becomes light, it will be excited. This process contributes to the tensor power spectrum. We compute these effects in a gauge-invariant manner, where we use a novel analytical method for evaluating the corrections to the tensor spectrum due to chi excitations. In the case of a scalar field, we show that the net impact on the tensors is small as long as the perturbative expansion is valid. Thus, in these scenarios, measurement of tensor modes is still in one-to-one correspondence with the Hubble scale.
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