Searching for Fossil Fields in the Gravity Sector. (arXiv:1906.07204v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Dimastrogiovanni_E/0/1/0/all/0/1">Emanuela Dimastrogiovanni</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fasiello_M/0/1/0/all/0/1">Matteo Fasiello</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tasinato_G/0/1/0/all/0/1">Gianmassimo Tasinato</a>
Evidence for the presence of extra fields during inflation may be found in
the anisotropies of the scalar and tensor spectra across a vast range of
scales. Indeed, beyond the single-field slow-roll paradigm, a long tensor mode
can modulate the power spectrum inducing a sizable quadrupolar anisotropy. We
investigate how this dynamics plays out for the tensor two-point correlator.
The resulting quadrupole stores information on squeezed tensor
non-Gaussianities, specifically those sourced by the extra field content and
responsible for the breaking of so-called consistency relations. We underscore
the potential of anisotropies as a probe of new physics: testable at CMB scales
through the detection of B-modes, they are accessible at smaller scales via
interferometers and pulsar timing arrays.
Evidence for the presence of extra fields during inflation may be found in
the anisotropies of the scalar and tensor spectra across a vast range of
scales. Indeed, beyond the single-field slow-roll paradigm, a long tensor mode
can modulate the power spectrum inducing a sizable quadrupolar anisotropy. We
investigate how this dynamics plays out for the tensor two-point correlator.
The resulting quadrupole stores information on squeezed tensor
non-Gaussianities, specifically those sourced by the extra field content and
responsible for the breaking of so-called consistency relations. We underscore
the potential of anisotropies as a probe of new physics: testable at CMB scales
through the detection of B-modes, they are accessible at smaller scales via
interferometers and pulsar timing arrays.
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