Second-order tensor vacuum fluctuations in pure de Sitter generate a nearly scale-invariant scalar power spectrum, offering a route to inflation without an inflaton scalar field.
Spectrum of relict gravitational ra- diation and the early state of the universe,
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Inflation without an Inflaton
Second-order tensor vacuum fluctuations in pure de Sitter generate a nearly scale-invariant scalar power spectrum, offering a route to inflation without an inflaton scalar field.