Gravitational waves generated by second order effects during inflation
arXiv:gr-qc/0612108 · doi:10.1088/1475-7516/2007/04/003
Abstract
The generation of gravitational waves during inflation due to the non-linear coupling of scalar and tensor modes is discussed. Two methods describing gravitational wave perturbations are used and compared: a covariant and local approach, as well as a metric-based analysis based on the Bardeen formalism. An application to slow-roll inflation is also described.
15 pages. v2 has minor changes to match published version
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