Small-scale tests of inflation

Laura Iacconi, Matteo Fasiello, Hooshyar Assadullahi, David Wands

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We investigate small-scale signatures of the inflationary particle content. We consider the case of a light spin-2 particle sourcing primordial gravitational waves by employing an effective field theory description. Upon allowing time-dependent sound speeds for the helicity modes, this setup delivers a blue tensor spectrum detectable, for example, by upcoming laser interferometers. Our focus is on the tensor non-Gaussianities that ensue from this field configuration. After characterising the bispectrum amplitude and shape-function at CMB scales, we move on to smaller scales where anisotropies induced in the tensor power spectrum by long-short modes coupling become the key handle on (squeezed) primordial non-Gaussianities. We identify the parameter space generating percent level anisotropies at scales soon to be probed by SKA and LISA.
Original languageEnglish
Article number005
Number of pages25
JournalJournal of Cosmology and Astroparticle Physics
Issue number12
Publication statusPublished - 3 Dec 2020


  • cosmology
  • inflation
  • gravitational waves
  • RCUK
  • STFC
  • ST/S000550/1
  • ST/R505018/1


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