Gravitational waves from p-form inflation

Abstract

Recently it was shown that an inflationary background can be realized by any $p$-form field non-minimally coupled to gravity. In this paper, we study gravitational waves generated during p-form inflation. Even though the background evolution is identical to that in conventional scalar field inflation, the behavior of gravitational waves is different in p-form inflation. In particular, we find that the propagation speed of gravitational waves differs from unity in 2- and 3-form inflationary models. We point out that the squared speed becomes negative in the large field models. The small field models are free from pathologies and the correction to the spectrum of gravitational waves turns out to be very small.

9 pages

References in corpus (11)

• Vector Inflation
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• Inflationary cosmology and the late-time accelerated expansion of the universe in non-minimal Yang-Mills-$F(R)$ gravity and non-minimal vector-$F(R)$ gravity
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• Non-minimally coupled vector curvaton
• Gravitational waves in vector inflation
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• Inflation from N-Forms and its stability
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• Three-form cosmology
• Cosmological perturbations from vector inflation
• Non-gaussianity from the trispectrum and vector field perturbations
• Non-gaussianity at tree and one-loop levels from vector field perturbations
• Interacting 3-form dark energy models: distinguishing interactions and avoiding the Little Sibling of the Big Rip
• Stable solutions of inflation driven by vector fields
• Stability of the 3-form field during inflation
• Inflation in a two 3-form fields scenario
• Three-form inflation and non-Gaussianity
• Anisotropic inflation with coupled $\mathbf{p}$-forms
• Perfect fluid in Lagrangian formulation due to generalized three-form field
• Perturbations and non-Gaussianities in three-form inflationary magnetogenesis
• The Slow-Roll and Rapid-Roll Conditions in the Space-like Vector Field Scenario
• Gravitational waves from inflation with antisymmetric tensor field
• The Unified First law in "Cosmic Triad" Vector Field Scenario
• Hamiltonian formalism and constraint analysis of three-form matter models coupled with general relativity
• Beyond general relativity: gravitational waves in non-minimally coupled theories