Vector Galileon and inflationary magnetogenesis

Understand

Cosmological inflation provides the initial conditions for the structure formation.

• However, the origin of large-scale magnetic fields cannot be addressed in this framework.
• The key issue for this long-standing problem is the conformal invariance of the electromagnetic (EM) field in 4-D.
• While many approaches have been proposed in the literature for breaking conformal invariance of the EM action, here, we provide a completely new way of looking at the modifications to the EM action and generation of primordial magnetic fields during inflation.