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Vector modes generated by primordial density fluctuations

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arxiv 0709.1619 v2 pith:WX6ZE45A submitted 2007-09-11 astro-ph gr-qc

Vector modes generated by primordial density fluctuations

classification astro-ph gr-qc
keywords modesdensityvectorduringeffectfluctuationsgeneratedproduced
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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While vector modes are usually ignored in cosmology since they are not produced during inflation they are inevitably produced from the interaction of density fluctuations of differing wavelengths. This effect may be calculated via a second-order perturbative expansion. We investigate this effect during the radiation era. We discuss the generation mechanism by investigating two scalar modes interacting, and we calculate the power of vector modes generated by a power-law spectrum of density perturbations on all scales.

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