4.4 Article

Non-Gaussianity as a particle detector

Journal

JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 12, Pages -

Publisher

SPRINGER
DOI: 10.1007/JHEP12(2016)040

Keywords

Cosmology of Theories beyond the SM; Effective field theories; Models of Quantum Gravity; Space-Time Symmetries

Funding

  1. EPSRC
  2. Cambridge Overseas Trust
  3. Starting Grant of the European Research Council (ERC) [279617]
  4. STFC [ST/L000636/1] Funding Source: UKRI
  5. Engineering and Physical Sciences Research Council [1352267] Funding Source: researchfish
  6. Science and Technology Facilities Council [ST/L000636/1] Funding Source: researchfish

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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.

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