Gravitational waves from primordial magnetic fields via photon-graviton conversion

Tomohiro Fujita, Kohei Kamada, Yuichiro Nakai

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


We explore a novel process in the early Universe in which thermalized photons are converted into gravitons in the presence of strong primordial magnetic fields. It is found that the frequency of generated gravitational waves (GWs) is typically of the order of GHz, and their amplitude can be up to ωGWh2∼10-10. If detected with future developments of the technology to explore this frequency region, the produced stochastic GW background enables us to know when and how strong the primordial magnetic fields are generated. From the peak frequency of the GWs, we can also probe the number of relativistic degrees of freedom at that time.

Original languageEnglish
Article number103501
JournalPhysical Review D
Issue number10
Publication statusPublished - 2020 Nov 2
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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