Open AccessMagnetogenesis in Natural Inflation Model
Author(s) -
Mehran Kamarpour,
O. O. Sobol
Publication year - 2018
Publication title -
ukrainian journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.213
H-Index - 17
eISSN - 2071-0194
pISSN - 2071-0186
DOI - 10.15407/ujpe63.8.673
Subject(s) - inflaton , inflation (cosmology) , physics , coupling (piping) , back reaction , spectral density , conformal symmetry , magnetic field , conformal map , quantum electrodynamics , planck , theoretical physics , classical mechanics , quantum mechanics , computer science , mathematics , geometry , mechanical engineering , engineering , telecommunications
We study the process of inflationary magnetogenesis in the natural single-field inflation model, whose parameters are chosen in accordance with the recent observations by the Planck collaboration [1]. The conformal invariance of the Maxwell action is broken by a kinetic coupling with the inflaton field by means of the coupling function as a power of the scale factor, I(ф) ∝ aa, and a < 0 is used in order to avoid the strong coupling problem. For such a, the electric component of the energy density dominates over the magnetic one and, for a <- −2.2, it causes a strong back-reaction, which can spoil inflation and terminate the enhancement of the magnetic field. It is found that the magnetic fields generated without back-reaction problem cannot exceed ∼10−20G at the present epoch, and their spectrum has a blue tilt.