Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Constraining models of inflationary magnetogenesis with NANOGrav data
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Pune University, India.ORCID iD: 0000-0002-2549-6861
Number of Authors: 12022 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 105, no 4, article id L041302Article in journal (Refereed) Published
Abstract [en]

Generation of magnetic field during inflation can explain its presence over a wide range of scales in the Universe. In [Sharma et al Phys. Rev. D 96, 083511 (2017)], we proposed a model to generate these fields during inflation. These fields have nonzero anisotropic stress which lead to the generation of a stochastic background of gravitational waves (GW) in the early universe. Here we show that for a scenario of magnetogenesis where reheating takes place around QCD epoch, this stochastic GW background lies in the 95% confidence region of the stochastic common spectrum process probed by NANOGrav collaboration. This is the case when the generated electromagnetic field (EM) energy density is 3%–10% of the background energy density at the end of reheating. For this case, the values of magnetic field strength B0∼(0.7–1.4)×10−11  G and its coherence length ∼3  kpc at the present epoch. These values are for the models in which EM fields are of nonhelical nature. For the helical nature of the fields, these values are B0∼(2.1–3.8)×10−10  G and its coherence length ∼90  kpc.

Place, publisher, year, edition, pages
2022. Vol. 105, no 4, article id L041302
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-203104DOI: 10.1103/PhysRevD.105.L041302ISI: 000761171300002Scopus ID: 2-s2.0-85126003720OAI: oai:DiVA.org:su-203104DiVA, id: diva2:1647114
Available from: 2022-03-25 Created: 2022-03-25 Last updated: 2022-03-25Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records

Sharma, Ramkishor

Search in DiVA

By author/editor
Sharma, Ramkishor
By organisation
Nordic Institute for Theoretical Physics (Nordita)
In the same journal
Physical Review D: covering particles, fields, gravitation, and cosmology
Astronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 18 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf