Footprint of Two-Form Field: Statistical Anisotropy in Primordial Gravitational Waves

Abstract

We study the observational signatures of two-form field in the inflationary cosmology. In our setup a two-form field is kinetically coupled to a spectator scalar field and generates sizable gravitational waves and smaller curvature perturbation. We find that the sourced gravitational waves have a distinct signature: they are always statistically anisotropic and their spherical moments are non-zero for hexadecapole and tetrahexacontapole, while the quadrupole moment vanishes. Since their amplitude can reach $\mathcal{O}(10^{-3})$ in the tensor-to-scalar ratio, we expect this novel prediction will be tested in the next generation of the CMB experiments.

19 pages, 2 figures. We apply our method developed in arXiv:1801.02778 to a new type of field

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Cited by in corpus (23)

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• Generation of Primordial Black Holes and Gravitational Waves from Dilaton-Gauge Field Dynamics
• Arbitrarily coupled $p-$forms in cosmological backgrounds
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