Searching for Fossil Fields in the Gravity Sector
  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.
