Inflation from Charged Scalar and Primordial Magnetic Fields?
Razieh Emami, Hassan Firouzjahi, M. Sadegh Movahed
TL;DR
This paper proposes an inflation model with a charged scalar field coupled to a U(1) gauge field, exploring the generation of primordial magnetic fields through a dynamic gauge kinetic coupling.
Contribution
It introduces a novel inflationary framework where a complex scalar field interacts with a gauge field, leading to magnetic field generation via a time-dependent gauge coupling.
Findings
Primordial magnetic fields can be generated during inflation.
The model breaks conformal invariance dynamically.
A time-dependent gauge kinetic coupling enhances magnetic field production.
Abstract
A model of inflation is presented where the inflaton field is a complex scalar field coupled to a U(1) gauge field. Due to the axial symmetry of the potential, the inflation is driven by the radial direction while the angular field is gauged by U(1). Due to the coupling of the inflaton to the gauge field, a time dependent mass term for the gauge field is generated dynamically and conformal invariance is broken. We study whether a significant amount of primordial magnetic fields can be generated during inflation by allowing a time-dependent U(1) gauge kinetic coupling.
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