Cosmological perturbations from an inhomogeneous phase transition

Details Cosmological perturbations from an inhomogeneous phase transition Cosmological perturbations from an inhomogeneous phase transition

2009-02-25

arxiv.org/abs/0902.4283v3

Class.Quant.Grav.26:145011,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 3 figures, minor changes, accepted for publication in CQG

Scientific paper

10.1088/0264-9381/26/14/145011

A mechanism for generating metric perturbations in inflationary models is considered. Long-wavelength inhomogeneities of light scalar fields in a decoupled sector may give rise to superhorizon fluctuations of couplings and masses in the low-energy effective action. Cosmological phase transitions may then occur that are not simultaneous in space, but occur with time lags in different Hubble patches that arise from the long-wavelength inhomogeneities. Here an interesting model in which cosmological perturbations may be created at the electroweak phase transition is considered. The results show that phase transitions may be a generic source of non-Gaussianity.

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