Gauge-invariant cosmological fluctuations of uncoupled fluids

Physics – Nuclear Physics

Scientific paper

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Scientific paper

The gauge-invariant approach to cosmological perturbations introduced by Bardeen is extended to the case of multiple fluids which are uncoupled, except for gravitational interactions. The most general scalar, vector, and tensor fluctuations are considered. The resulting equations are applied to fluctuations involving axions and radiation and axions and baryons in the early universe.

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