Non-Gaussianity as a Particle Detector
arXiv:1607.03735 · doi:10.1007/JHEP12(2016)040
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 symmetry of the inflationary background. We derive explicit shape functions for the scalar and tensor bispectra that can serve as templates for future observational searches.
55 pages, 10 figures
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Cited by in corpus (13)
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- On the Inflationary Perturbations of Massive Higher-Spin Fields
- Detecting higher spin fields through statistical anisotropy in the CMB and galaxy power spectra
- Scale-Dependent Galaxy Bias from Massive Particles with Spin during Inflation
- A Bound on Massive Higher Spin Particles
- On the inflationary massive field with a curved field manifold
- On the Effective Field Theory for Quasi-Single Field Inflation
- Cosmological Shapes of Higher-Spin Gravity
- Possible Signatures of Inflationary Particle Content: Spin-2 Fields
- Large gauge transformation, Soft theorem, and Infrared divergence in inflationary spacetime
- Heavy Fields and Gravity
- Constraining graviton non-Gaussianity through the CMB bispectra
- Schwinger-Keldysh mechanism in extended quasi single field inflation