Astroparticle Physics

Axion clouds around pulsars

by Samuel Witte (University of Oxford)

Europe/Berlin
seminar room 3 (bldg. 1b)

seminar room 3

bldg. 1b

Description
In this talk I will discuss a series of recent papers which focus on the production of and observable implications arising from high-density clouds of axions surrounding pulsars. I will try to convince you that the appearance of these clouds is a rather generic phenomenon that is expected to arise for axions across a broad range of parameter space, with typical densities near the neutron star surface easily exceeding the local dark matter density by more than 15 orders of magnitude. I will then discuss how these axion clouds naturally source radio emission, and how exceptionally high-density clouds can back-react on the electrodynamics governing the production of radiation in the magnetosphere itself. This is a young, but promising, field which offers immense complementarity with more traditional searches for axions in the laboratory