Estimating the amount of vorticity generated by cosmological perturbations in the early universe

Details Estimating the amount of vorticity generated by cosmological perturbations in the early universe Estimating the amount of vorticity generated by cosmological perturbations in the early universe

2010-08-28

arxiv.org/abs/1008.4866v2

Phys.Rev.D83:123512,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

9 pages, revtex4, 1 figure; v2: typos and minor error corrected, result unchanged

Scientific paper

10.1103/PhysRevD.83.123512

We estimate the amount of vorticity generated at second order in cosmological perturbation theory from the coupling between first order energy density and non-adiabatic pressure, or entropy, perturbations. Assuming power law input spectra for the source terms, and working in a radiation background, we calculate the wave number dependence of the vorticity power spectrum and its amplitude. We show that the vorticity generated by this mechanism is non-negligible on small scales, and hence should be taken into consideration in current and future CMB experiments.

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