Evolution of hydromagnetic turbulence from the electroweak phase transition

Axel Brandenburg, Tina Kahniashvili, Sayan Mandal, Alberto Roper Pol, Alexander G. Tevzadze, Tanmay Vachaspati

Research output: Contribution to journalArticlepeer-review

71 Scopus citations


We present new simulations of decaying hydromagnetic turbulence for a relativistic equation of state relevant to the early Universe. We compare helical and nonhelical cases either with kinetically or magnetically dominated initial fields. Both kinetic and magnetic initial helicities lead to maximally helical magnetic fields after some time, but with different temporal decay laws. Both are relevant to the early Universe, although no mechanisms have yet been identified that produce magnetic helicity with strengths comparable to the big bang nucleosynthesis limit at scales comparable to the Hubble horizon at the electroweak phase transition. Nonhelical magnetically dominated fields could still produce picoGauss magnetic fields under most optimistic conditions. Only helical magnetic fields can potentially have nanoGauss strengths at scales up to 30 kpc today.

Original languageEnglish (US)
Article number123528
JournalPhysical Review D
Issue number12
StatePublished - Dec 15 2017

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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