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Gravitational waves from density perturbations

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In this talk, I review second order generation of gravitational waves from first order density perturbations. The second order gravitational waves could provide us valuable information on density perturbations at very small scales where we do not have any direct way to measure density perturbations. We first discuss the second order tensor perturbations during inflation and how they evolve in the radiation dominated era after inflation. We carefully examine the gauge dependence of the tensor perturbations at second order. We also consider generation of second order tensor perturbations in matter dominated era either in early universe after reheating and in the late time universe.

This talk is part of the Wednesday HEP-GR Colloquium series.

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