Scale-invariant power spectra from a Weyl-invariant scalar-tensor theory
arXiv:1508.04188 · doi:10.1140/epjc/s10052-016-3924-0
Abstract
We obtain scale-invariant scalar and tensor power spectra from a Weyl-invariant scalar-tensor theory in de Sitter spacetime. This implies that the Weyl-invariance guarantees to implement the scale-invariance of power spectrum in de Sitter spacetime. We establish a deep connection between the Weyl-invariance of the action and scale-invariance of power spectrum in de Sitter spacetime.
19 pages, no figures, version to appear in EPJC. arXiv admin note: text overlap with arXiv:1407.0441
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