Author:
Dimastrogiovanni Ema,Fasiello Matteo,Pinol Lucas
Abstract
Abstract
Primordial non-Gaussianities of the scalar(tensor)-tensor-tensor type supporting a
non-trivial squeezed component are known to induce anisotropies in the stochastic gravitational
wave background. We derive the explicit form of such anisotropies by making use, for the first
time in this context, of the in-in formalism for cosmological correlation functions. After
illustrating the general method and using it for the minimal single-field slow-roll case, we apply
it to multi-field models, providing both a tree-level and a one-loop example. First, we make
contact with previous results on anisotropies due to the presence of an extra spin-2 field during
inflation. Secondly, we calculate the 1-loop scalar-tensor-tensor three-point function in the
context of so-called supersolid inflation. The corresponding gravitational wave anisotropy is
induced atop a gravitational signal that may be sufficiently large for detection.
Subject
Astronomy and Astrophysics
Cited by
11 articles.
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