Scalar perturbations in conformal rolling scenario with intermediate stage

Details Scalar perturbations in conformal rolling scenario with intermediate stage Scalar perturbations in conformal rolling scenario with intermediate stage

2011-02-07

arxiv.org/abs/1102.1390v3

JCAP 1106:010,2011

Physics

High Energy Physics

High Energy Physics - Theory

35 pages, 1 figure. Journal version. Discussion of the range of relevant momentum scales and bounds on parameters added

Scientific paper

10.1088/1475-7516/2011/06/010

Scalar cosmological perturbations with nearly flat power spectrum may originate from perturbations of the phase of a scalar field conformally coupled to gravity and rolling down negative quartic potential. We consider a version of this scenario whose specific property is a long intermediate stage between the end of conformal rolling and horizon exit of the phase perturbations. Such a stage is natural, e.g., in cosmologies with ekpyrosis or genesis. Its existence results in small negative scalar tilt, statistical anisotropy of all even multipoles starting from quardupole of general structure (in contrast to the usually discussed single quadrupole of special type) and non-Gaussianity of a peculiar form.

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