期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 3, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2011/03/003
关键词
alternatives to inflation; cosmological perturbation theory; cosmic singularity; physics of the early universe
资金
- Department of Physics at Arizona State University
- NSERC at McGill University
- Canada Research Chairs program
- National Natural Science Foundation of China [10975142, 10821063, 11033005]
- 973 program [1J2007CB81540002]
- Chinese Academy of Sciences [KJCX3-SYW-N2]
Massless scalar fields originating in a quantum vacuum state acquire a scale-invariant spectrum of fluctuations in a matter-dominated contracting universe. We show that these isocurvature fluctuations transfer to a scale-invariant spectrum of curvature fluctuations during a non-singular bounce phase. This provides a mechanism for enhancing the primordial adiabatic fluctuations and suppressing the ratio of tensor to scalar perturbations. Moreover, this mechanism leads to new sources of non-Gaussianity of curvature perturbations.
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