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Relic cosmological vector fields and inflationary gravitational waves

Avery J. Tishue* and Robert R. Caldwell

  • Department of Physics and Astronomy, Dartmouth College, 6127 Wilder Laboratory, Hanover, New Hampshire 03755, USA

  • *avery.tishue.gr@dartmouth.edu
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Phys. Rev. D 104, 063531 – Published 16 September, 2021

DOI: https://doi.org/10.1103/PhysRevD.104.063531

Abstract

We show that relic vector fields can significantly impact a spectrum of primordial gravitational waves in the postinflationary era. We consider a triplet of U(1) fields in a homogeneous, isotropic configuration. The interaction between the gravitational waves and the vector fields, from the end of reheating to the present day, yields novel spectral features. The amplitude, tilt, shape, and net chirality of the gravitational wave spectrum are shown to depend on the abundance of the electric- and magneticlike vector fields. Our results show that even a modest abundance can have strong implications for efforts to detect the imprint of gravitational waves on the cosmic microwave background polarization. We find that a vector field comprising less than 2% of the energy density during the radiation-dominated era can have a greater than order unity effect on the predicted inflationary gravitational wave spectrum.

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Phys. Rev. D 104, 063531– Published 16 September, 2021
  • Received 4 June 2021
  • Accepted 15 August 2021
Article part of CHORUS
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