DBI with Primordial Magnetic Field in the Sky

Abstract

In this paper, we study the generation of a large scale magnetic field with amplitude of order $\mu$G in an inflationary model which has been introduced in hep-th/0310221. This inflationary model based on existence of a speed limit for inflaton field. Generating a mass for inflaton at scale above the ${\varphi }_{IR}$, breaks the conformal triviality of the Maxwell equation and causes to originate a magnetic field during the inflation. The amplitude strongly depends on the details of reheating stage and also depends on the e-foldings parameter N. We find the amplitude of the primordial magnetic field at decoupling time in this inflationary background using late time behavior of the theory.

12 pages, no figure, typos corrected

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• Coherence and oscillations of cosmic neutrinos
• Generic estimates for magnetic fields generated during inflation including Dirac-Born-Infeld theories
• Inflation from Charged Scalar and Primordial Magnetic Fields?
• Large-scale magnetic fields from inflation due to Chern-Simons-like effective interaction
• The interrelation between the generation of large-scale electric fields and that of large-scale magnetic fields during inflation
• IR Inflation from Multiple Branes
• Property of the spectrum of large-scale magnetic fields from inflation
• Gauge field back-reaction in Born Infeld cosmologies
• A Quintessentially Geometric Model
• Large-scale magnetic fields from inflation due to a $CPT$-even Chern-Simons-like term with Kalb-Ramond and scalar fields
• Two-loop QED Corrections to Bhabha Scattering
• Non-relativistic Matrix Inflation