Cosmological Magnetic Fields from Inflation and Backreaction

Details Cosmological Magnetic Fields from Inflation and Backreaction Cosmological Magnetic Fields from Inflation and Backreaction

2009-08-24

arxiv.org/abs/0908.3509v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

14 pages, 1 figure, references added

Scientific paper

We study the backreaction problem in a mechanism of magnetogenesis from inflation. In usual analysis, it has been assumed that the backreaction due to electromagnetic fields spoils inflation once it becomes important. However, there exists no justification for this assumption. Hence, we analyze magnetogenesis from inflation by taking into account the backreaction. On the contrary to the naive expectation, we show that inflation still continues even after the backreaction begins to work. Nevertheless, it turns out that creation of primordial magnetic fields is significantly suppressed due to the backreaction.

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