Cosmological Magnetogenesis From Extra-dimensional Gauss Bonnet Gravity

Understand

Generation of primordial magnetic fields during inflation typically requires the breaking of conformal invariance of the Electromagnetic action.

• In this paper this has been achieved naturally in a higher dimensional cosmological model with a Gauss-Bonnet term in the action.
• The evolution of the scale factor of the extra dimension (whose dynamics is influenced by the Gauss-Bonnet term) acts as the cause for the breaking of conformal invariance.
• Different cases have been investigated, each of which is characterized by the number of higher dimensions, the value of the Gauss-Bonnet parameter, and the cosmological constant.