Early Universe Dynamos from Neutrino Oscillations Induced by Torsion

TL;DR

This paper explores how neutrino oscillations induced by spacetime torsion could generate primordial magnetic fields, potentially seeding galactic magnetic fields and influencing early universe magnetism.

Contribution

It presents new models linking torsion and neutrino densities to cosmological magnetic seed fields, extending previous work on neutrino-induced magnetogenesis.

Findings

Torsion can generate seed magnetic fields of order 10^{-12} G at present day.

Relic magnetic fields of order 10^{39} G can originate from primordial nucleosynthesis conditions.

Weak fields torsion can slow magnetic field decay, supporting earlier theories.

Abstract

Earlier de Sabbata and Gasperini have shown that neutrinos oscillation which gives them a mass can be induced by torsion. More recently Enqvist et al have shown that it is possible to use massive neutrinos BBN magnetic fields to seed galactic magnetic fields. Thus based on these previous investigations we present several examples of how obtaining cosmological magnetic seed fields as galactic magnetic fields from massive neutrino densities and also from the torsion obtained by Nitsch as $T\approx{10^{-24}s^{-1}}$ at the present day which yields magnetic seed field of the order of $B_{seed}\approx{10^{-12}G}$. In the case we use torsion derived from massive neutrinos given by $T_{\nu}\approx{10^{-26}s^{-1}}$ one obtains in BBN time $t\approx{1s}$ with the primordial nucleosynthesis magnetic field given by $B_{BBN}\approx{10^{11}G}$ a relic magnetic field $B_{c}\approx{10^{39}G}$ which shows that the result obtained by Enqvist et al for the cosmological fields at the early universe. Galactic dynamo seed could be obtained from neutrinos at recombination. It is also shown that in the approximation of weak fields torsion can slow down the decay of magnetic fields which confirms previous results. At Planck era where the time is $t\sim{10^{-43}s}$ and $B_{Pl}\sim{10^{58}G}$ the use of formula with the strongest torsion $10^{-19}G$this yields $B_{seed}\sim{10^{-4}G}$ is a too strong field to warrant a galactic dynamo seed.