2021/09/07 by Emanuela Dimastrogiovanni, Ema Dimastrogiovanni, Matteo Fasiello +3 · 40 citations
Physics and Astronomy · #Anisotropy #Astrophysics #Black Holes and Theoretical Physics #Classical mechanics #Cosmic microwave background #Cosmological perturbation theory #Cosmology and Gravitation Theories #Gravitation #Gravitational wave #Gravitational wave background #Inflation (cosmology) #Physics #Pulsars and Gravitational Waves Research #Quantum mechanics #Scalar (mathematics) #Tensor (intrinsic definition) #Theoretical physics #Universe #astro-ph.CO #gr-qc #hep-ph #hep-th
paper · pdf · open access · doi:10.1088/1475-7516/2022/02/040
published in Journal of Cosmology and Astroparticle Physics 2022(02), 040 (Institute of Physics) · 47 pages, 16 figures
arxiv created 2021/09/07 · openalex created_date 2021/09/13 · openalex publication_date 2022/02/01 · arxiv updated 2022/03/09 · openalex updated_date 2026/08/05
In this work we analyse in detail the possibility of using small and intermediate-scale gravitational wave anisotropies to constrain the inflationary particle content. First, we develop a phenomenological approach focusing on anisotropies generated by primordial tensor-tensor-scalar and purely gravitational non-Gaussianities. We highlight the quantities that play a key role in determining the detectability of the signal. To amplify the power of anisotropies as a probe of early universe physics, we consider cross-correlations with CMB temperature anisotropies. We assess the size of the signal from inflationary interactions against so-called induced anisotropies. In order to arrive at realistic estimates, we obtain the projected constraints on the non-linear primordial parameter F\rm NL for several upcoming gravitational wave probes in the presence of the astrophysical gravitational wave background. We further illustrate our findings by considering a concrete inflationary realisation and use it to underscore a few subtleties in the phenomenological analysis.