Work

Inflation with an antisymmetric tensor field

Year: 2018

Type: article

Abstract: We investigate the possibility of inflation with models of antisymmetric tensor field having minimal and nonminimal couplings to gravity. Although the minimal model does not support inflation, the nonminimal models, through the introduction of a nonminimal coupling to gravity, can give rise to stable de-Sitter solutions with a bound on the coupling parameters. The values of field and coupling parameters are sub-planckian. Slow roll analysis is performed and slow-roll parameters are defined which can give the required number of e-folds for sufficient inflation. Stability analysis has been performed for perturbations to antisymmetric field while keeping the metric unperturbed, and it is found that only the sub-horizon modes are free of ghost instability for de-Sitter space.

Source: The European Physical Journal C

DOI: 10.1140/epjc/s10052-018-6366-z

Authors: Sandeep Aashish, Abhilash Padhy, Sukanta Panda, Arun Rana

Institution: Indian Institute of Science Education and Research, Bhopal

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funders: Department of Science and Technology, Ministry of Science and Technology, India, Science and Engineering Research Board

Awards: G2564252731, G4330961266