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Journal Articles Physical Review D Year : 2022

Explicit spacetime-symmetry breaking and the dynamics of primordial fields

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Abstract

We study the effects of explicit spacetime-symmetry breaking on primordial tensor fluctuations using an effective-field theory for Lorentz/CPT violation. We find that the graviton is still massless, but that the propagation speed of tensor modes is modified, and we obtain a constraint on the coefficient determining the symmetry breaking on the order of 10-15 from the recent measurements of the speed of gravity. Due to the symmetry breaking, the de-Sitter phase is modified, and during this inflationary epoch, the power spectrum assumes a slow oscillation around the general-relativity limit; further, we find that the primordial tensor power spectrum retains its scale invariance, but that the amplitude is modified. We also find that the modes which become subhorizon during radiation domination acquire a phase shift proportional to the coefficient for Lorentz violation.

Dates and versions

insu-03874799 , version 1 (28-11-2022)

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Nils A. Nilsson. Explicit spacetime-symmetry breaking and the dynamics of primordial fields. Physical Review D, 2022, 106, ⟨10.1103/PhysRevD.106.104036⟩. ⟨insu-03874799⟩
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