Inflationary magnetogenesis without the strong coupling problem

By R. Z. Ferreira, R. K. Jain, M. Sloth. 2013

143 citations recorded by the source corpus.

The simplest gauge invariant models of inflationary magnetogenesis are known to suffer from the problems of either large backreaction or strong coupling, which make it difficult to self-consistently achieve cosmic magnetic fields from inflation with a field strength larger than 10{sup −32}G today on the Mpc scale. Such a strength is insufficient to act as seed for the galactic dynamo effect, which requires a magnetic field larger than 10{sup −20}G. In this paper we analyze simple extensions of the minimal model, which avoid both the strong coupling and back reaction problems, in order to generate sufficiently large magnetic fields on the Mpc scale today. First we study the possibility that the coupling function which breaks the conformal invariance of electromagnetism is non-monotonic with sharp features. Subsequently, we consider the effect of lowering the energy scale of inflation jointly with a scenario of prolonged reheating where the universe is dominated by a stiff fluid for a short period after inflation. In the latter case, a systematic study shows upper bounds for the magnetic field strength today on the Mpc scale of 10{sup −13}G for low scale inflation and 10{sup −25}G for high scale inflation, thus improving on the previous result bymore » 7-19 orders of magnitude. These results are consistent with the strong coupling and backreaction constraints.« less

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/dcc0898d0dd1e2e1b5b69647926b5602016c7576

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. C. Caprini
2. L. Sorbo
3. Marco Peloso
4. R. Durrer
5. G. Servant
6. E. Pajer
7. R. Namba
8. C. Unal

In Instrumentation

1. C. Caprini
2. L. Sorbo

Citations in the corpus

• Adding helicity to inflationary magnetogenesis (2014, background): “Stronger magnetic fields can be obtained by choosing n < −2 and assuming an infrared cutoff associated to the beginning of magnetogenesis during inflation [9, 11].”