title: Active galactic nuclei shed light on axionlike particles.
abstract: We demonstrate that the scatter in the luminosity relations of astrophysical objects can be used to search for axionlike particles. This analysis is applied to observations of active galactic nuclei, where we find evidence highly suggestive of the existence of a very light axionlike particle.
authors.affiliation: Theory Group, Deutsches Elektronen-Synchrotron DESY, D-22603 Hamburg, Germany.
authors.forename: Clare
authors.initials: C
authors.lastname: Burrage
authors.forename: Anne-Christine
authors.initials: AC
authors.lastname: Davis
authors.forename: Douglas J
authors.initials: DJ
authors.lastname: Shaw