Magnetic dynamo caused by axions in neutron stars by Filippo Anzuini et al. on Monday 21 November

The coupling between axions and photons modifies Maxwell's equations,

introducing a dynamo term in the magnetic induction equation. In neutron stars,

for critical values of the axion decay constant and axion mass, the magnetic

dynamo mechanism increases the total magnetic energy of the star. We show that

this generates substantial internal heating due to enhanced dissipation of

crustal electric currents. These mechanisms would lead magnetized neutron stars

to increase their magnetic energy and thermal luminosity by several orders of

magnitude, in contrast to observations of thermally-emitting neutron stars. To

prevent the activation of the dynamo, bounds on the allowed axion parameter

space can be derived.

arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.10863v1