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New Physics
Speed of Sound
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Equilateral nongaussianity and new physics on the horizon
Equilateral nongaussianity and new physics on the horizon,10.1088/14757516/2011/09/014,Journal of Cosmology and Astroparticle Physics,Daniel Baumann
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Equilateral nongaussianity and new physics on the horizon
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Daniel Baumann
,
Daniel Green
We examine the effective theory of singlefield inflation in the limit where the scalar perturbations propagate with a small speed of sound. In this case the nonlinearly realized timetranslation symmetry of the Lagrangian implies large interactions, giving rise to primordial nonGaussianities. When the nonGaussianities are measurable, these interactions will become strongly coupled unless
new physics
appears close to the Hubble scale. Due to its proximity to the Hubble scale, the
new physics
is not necessarily decoupled from inflationary observables and can potentially affect the predictions of the model. To understand the types of corrections that may arise, we construct weaklycoupled completions of the theory and study their observational signatures.
Journal:
Journal of Cosmology and Astroparticle Physics  JCAP
, vol. 9, no. 09, pp. 014014, 2011
DOI:
10.1088/14757516/2011/09/014
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