Constraints on scalar and tensor spectra from Neff
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DOI: 10.1088/1475-7516/2019/06/007
Abstract: At the linear level, the gravitational wave (GW) spectrum predicted by inflation, and many of its alternatives, can have arbitrarily small amplitude and consequently an unconstrained tilt. However, at second order, tensor fluctuations are sourced… read more here.
Keywords: tensor; tensor spectra; spectrum; scalar spectrum ... See more keywords