2016
DOI: 10.1007/jhep12(2016)040
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Non-Gaussianity as a particle detector

Abstract: Abstract:We study the imprints of massive particles with spin on cosmological correlators. Using the framework of the effective field theory of inflation, we classify the couplings of these particles to the Goldstone boson of broken time translations and the graviton. We show that it is possible to generate observable non-Gaussianity within the regime of validity of the effective theory, as long as the masses of the particles are close to the Hubble scale and their interactions break the approximate conformal … Show more

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Cited by 229 publications
(379 citation statements)
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References 73 publications
(199 reference statements)
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“…(See also refs. [22][23][24][25].) Our study provides the conditions for the absence of such an imprint made after the Hubble crossing time of the comoving scale of our interest during inflation.…”
Section: Jhep10(2017)127mentioning
confidence: 82%
“…(See also refs. [22][23][24][25].) Our study provides the conditions for the absence of such an imprint made after the Hubble crossing time of the comoving scale of our interest during inflation.…”
Section: Jhep10(2017)127mentioning
confidence: 82%
“…The above minimal case geometrically means that the inflaton trajectory is strictly straight in the field space landscape, and realistically we expect some level of bending of the trajectory that naturally introduces direct couplings between the inflaton and heavy fields [2,3,7,29]. There can also be other types of direct couplings that may not be easily visualized geometrically [3].…”
Section: E Implications For Inflation Modelsmentioning
confidence: 99%
“…Because heavy fields do not respect any slow-roll conditions, their self-interactions are potential sources of large non-linearities [2,3,29]. This introduces diagrams such as B in Fig.…”
Section: E Implications For Inflation Modelsmentioning
confidence: 99%
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