Inflation with antisymmetric tensor field: new candidates

Abstract

We study classes of inflation models driven by antisymmetric tensor field, with minimal and nonminimal couplings to gravity, that address known issues of such models considered in the past. First we show that with a different choice of the background structure of antisymmetric tensor field, inflation is supported even for the minimal model with quadratic potential contrary to past results. We also include the nonminimal coupling to gravity and analyse perturbations to the antisymmetric tensor as well as the tensor modes of perturbed metric. The two models differ in terms of the behaviour of tensor modes, where the speed of gravitational wave can be tuned to $c$ in the latter model. The power spectrum and spectral index receive slight scale dependence. Finally, we consider a quartic potential motivated by the graceful exit to reheating phase, which requires a nonminimal coupling to support inflation. The two tensor modes of perturbed metric are found to evolve differently in this model, and give rise to a highly scale-dependent power spectrum.

40 pages, 16 figures; erroneous calculations have been replaced in section V, references added; published version

References in corpus (19)

• Inflationary Universe with Anisotropic Hair
• Inflationary cosmology in modified gravity theories
• Vector Inflation
• Chiral Primordial Gravitational Waves from a Lifshitz Point
• The Nature of Primordial Fluctuations from Anisotropic Inflation
• Planck 2018 results. IX. Constraints on primordial non-Gaussianity
• Anisotropic Power-law Inflation
• Multiple field inflation
• Inflation from N-Forms and its stability
• More hilltop inflation models
• Kerr/CFT Correspondence in the Low Energy Limit of Heterotic String Theory
• Inflation with a quartic potential in the framework of Einstein-Gauss-Bonnet gravity
• dS Vacua and the Swampland
• End of multi-field inflation and the perturbation spectrum
• The cosmology of the nonsymmetric theory of gravitation
• Relaxing inflation models with non-minimal coupling: A general study
• Observational constraints on assisted k-inflation
• Dynamics of inflation with mutually orthogonal vector fields in a closed universe
• Dark matter and dark energy in combinatorial quantum gravity