2020/08/31 by Laura Iacconi, Matteo Fasiello, Hooshyar Assadullahi +1
Physics and Astronomy · #Amplitude #Bispectrum #Cosmic microwave background #Cosmological perturbation theory #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Field (mathematics) #Galaxies: Formation, Evolution, Phenomena #Gravitational wave #Inflation (cosmology) #Parameter space #Spectral density #Tensor (intrinsic definition) #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1088/1475-7516/2020/12/005
published as JCAP 12 (2020) 005 · 24 pages, 15 figures. Version accepted for publication
openalex created_date 2020/08/07 · openalex publication_date 2020/12/03 · arxiv created 2020/12/07 · arxiv updated 2020/12/08 · openalex updated_date 2026/08/05
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.