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Cosmological collider non-Gaussianity from multiple scalars and $R^2$ gravity
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abstract
Cosmological collider signals of primordial non-Gaussianity arise at tree level when an extra scalar has Hubble mass during inflation. We critically review the formalism finding that a large class of inflationary theories, based on Planck-scale physics, predict a scalar bi-spectrum around the gravitational floor level. This mild signal arises for example in $R^2$ gravity, in the regime where its gravitational scalar has Hubble-scale mass. Signals much above the gravitational floor arise in theories where scalars undergo multiple turns during inflation, thanks to sub-Planckian physics.
Forward citations
Cited by 2 Pith papers
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The Exact and Approximate Tales of Boost-Breaking Cosmological Correlators
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Large deviations for halos and voids: beyond perturbative non-gaussianities
Excursion-set halo and void abundances are derived for exponential-tailed non-Gaussian fluctuations, giving new first-passage-time formulas and a void-size-function series.
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