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A scenario for inflationary magnetogenesis without strong coupling problem

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A scenario for inflationary magnetogenesis without strong coupling problem. / Tasinato, Gianmassimo.

In: Journal of Cosmology and Astroparticle Physics, Vol. 2015, No. 3, 040, 23.03.2015.

Research output: Contribution to journalArticlepeer-review

Harvard

Tasinato, G 2015, 'A scenario for inflationary magnetogenesis without strong coupling problem', Journal of Cosmology and Astroparticle Physics, vol. 2015, no. 3, 040. https://doi.org/10.1088/1475-7516/2015/03/040

APA

Tasinato, G. (2015). A scenario for inflationary magnetogenesis without strong coupling problem. Journal of Cosmology and Astroparticle Physics, 2015(3), [040]. https://doi.org/10.1088/1475-7516/2015/03/040

Vancouver

Tasinato G. A scenario for inflationary magnetogenesis without strong coupling problem. Journal of Cosmology and Astroparticle Physics. 2015 Mar 23;2015(3). 040. https://doi.org/10.1088/1475-7516/2015/03/040

Author

Tasinato, Gianmassimo. / A scenario for inflationary magnetogenesis without strong coupling problem. In: Journal of Cosmology and Astroparticle Physics. 2015 ; Vol. 2015, No. 3.

Bibtex

@article{cb63c1623ce24d8d9579ba56917766fc,
title = "A scenario for inflationary magnetogenesis without strong coupling problem",
abstract = "Cosmological magnetic fields pervade the entire universe, from small to large scales. Since they apparently extend into the intergalactic medium, it is tantalizing to believe that they have a primordial origin, possibly being produced during inflation. However, finding consistent scenarios for inflationary magnetogenesis is a challenging theoretical problem. The requirements to avoid an excessive production of electromagnetic energy, and to avoid entering a strong coupling regime characterized by large values for the electromagnetic coupling constant, typically allow one to generate only a tiny amplitude of magnetic field during inflation. We propose a scenario for building gauge-invariant models of inflationary magnetogenesis potentially free from these issues. The idea is to derivatively couple a dynamical scalar, not necessarily the inflaton, to fermionic and electromagnetic fields during the inflationary era. Such couplings give additional freedom to control the time-dependence of the electromagnetic coupling constant during inflation. This fact allows us to find conditions to avoid the strong coupling problems that affect many of the existing models of magnetogenesis. We do not need to rely on a particular inflationary set-up for developing our scenario, that might be applied to different realizations of inflation. On the other hand, specific requirements have to be imposed on the dynamics of the scalar derivatively coupled to fermions and electromagnetism, that we are able to satisfy in an explicit realization of our proposal.",
keywords = "Inflation, Primordial magnetic fields, RCUK, STFC, ST/H005498/1",
author = "Gianmassimo Tasinato",
year = "2015",
month = mar,
day = "23",
doi = "10.1088/1475-7516/2015/03/040",
language = "English",
volume = "2015",
journal = "Journal of Cosmology and Astroparticle Physics",
issn = "1475-7516",
publisher = "IOP Publishing",
number = "3",

}

RIS

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T1 - A scenario for inflationary magnetogenesis without strong coupling problem

AU - Tasinato, Gianmassimo

PY - 2015/3/23

Y1 - 2015/3/23

N2 - Cosmological magnetic fields pervade the entire universe, from small to large scales. Since they apparently extend into the intergalactic medium, it is tantalizing to believe that they have a primordial origin, possibly being produced during inflation. However, finding consistent scenarios for inflationary magnetogenesis is a challenging theoretical problem. The requirements to avoid an excessive production of electromagnetic energy, and to avoid entering a strong coupling regime characterized by large values for the electromagnetic coupling constant, typically allow one to generate only a tiny amplitude of magnetic field during inflation. We propose a scenario for building gauge-invariant models of inflationary magnetogenesis potentially free from these issues. The idea is to derivatively couple a dynamical scalar, not necessarily the inflaton, to fermionic and electromagnetic fields during the inflationary era. Such couplings give additional freedom to control the time-dependence of the electromagnetic coupling constant during inflation. This fact allows us to find conditions to avoid the strong coupling problems that affect many of the existing models of magnetogenesis. We do not need to rely on a particular inflationary set-up for developing our scenario, that might be applied to different realizations of inflation. On the other hand, specific requirements have to be imposed on the dynamics of the scalar derivatively coupled to fermions and electromagnetism, that we are able to satisfy in an explicit realization of our proposal.

AB - Cosmological magnetic fields pervade the entire universe, from small to large scales. Since they apparently extend into the intergalactic medium, it is tantalizing to believe that they have a primordial origin, possibly being produced during inflation. However, finding consistent scenarios for inflationary magnetogenesis is a challenging theoretical problem. The requirements to avoid an excessive production of electromagnetic energy, and to avoid entering a strong coupling regime characterized by large values for the electromagnetic coupling constant, typically allow one to generate only a tiny amplitude of magnetic field during inflation. We propose a scenario for building gauge-invariant models of inflationary magnetogenesis potentially free from these issues. The idea is to derivatively couple a dynamical scalar, not necessarily the inflaton, to fermionic and electromagnetic fields during the inflationary era. Such couplings give additional freedom to control the time-dependence of the electromagnetic coupling constant during inflation. This fact allows us to find conditions to avoid the strong coupling problems that affect many of the existing models of magnetogenesis. We do not need to rely on a particular inflationary set-up for developing our scenario, that might be applied to different realizations of inflation. On the other hand, specific requirements have to be imposed on the dynamics of the scalar derivatively coupled to fermions and electromagnetism, that we are able to satisfy in an explicit realization of our proposal.

KW - Inflation

KW - Primordial magnetic fields

KW - RCUK

KW - STFC

KW - ST/H005498/1

UR - http://www.scopus.com/inward/record.url?scp=84928659331&partnerID=8YFLogxK

U2 - 10.1088/1475-7516/2015/03/040

DO - 10.1088/1475-7516/2015/03/040

M3 - Article

AN - SCOPUS:84928659331

VL - 2015

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 3

M1 - 040

ER -

ID: 7760237