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- W1993497149 abstract "We consider a non-inflationary early Universe scenario in which relevant scalar perturbations get frozen out at some point, but then are defrosted and follow a long nearly Minkowskian evolution before the hot era. This intermediate stage leaves specific imprint on the CMB 3-point function, largely independent of details of microscopic physics. In particular, the CMB bispectrum undergoes oscillations in the multipole l space with roughly constant amplitude. The latter is in contrast to the oscillatory bispectrum enhanced in the flattened triangle limit, as predicted by inflation with non-Bunch--Davies vacuum. Given this and other peculiar features of the bispectrum, stringent constraints imposed by the Planck data may not apply. The CMB 3-point function is suppressed by the inverse duration squared of the Minkowskian evolution, but can be of observable size for relatively short intermediate Minkowskian stage." @default.
- W1993497149 created "2016-06-24" @default.
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- W1993497149 date "2014-04-15" @default.
- W1993497149 modified "2023-10-18" @default.
- W1993497149 title "Effect of intermediate Minkowskian evolution on CMB bispectrum" @default.
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- W1993497149 doi "https://doi.org/10.1088/1475-7516/2014/04/015" @default.
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