L. H. C. Borges, A. G. Dias, A. F. Ferrari, J. R. Nascimento, A. Yu. Petrov
Light pseudoscalars, or axions like particles (ALPs), are much studied due to their potential relevance to the fields of particle physics, astrophysics and cosmology. The most relevant coupling of ALPs from the viewpoint of current experimental searches is to the photon: in this work, we study the generation of this coupling as an effect of quantum corrections, originated from the presence of a fermion field which feels an underlying Lorentz violating background. We show that this mechanism involves the calculation of a triangle graph, which is finite but ambiguous, so it might represent an interesting connection between a theoretical puzzle and an active field of experimental research. Most interestingly, we show that the axion-photon interaction generated by this mechanism turns out to be Lorentz invariant, thus mimicking the standard ALPs coupling to photon that is considered in the experiments. We comment on what kind of bounds in Lorentz violating parameters might be obtained from this connection. Finally, we argue that a similar mechanism can also generate Lorentz invariant coupling involving scalar particles and the photon, thus playing a possible role in the phenomenology of Higgs bosons.
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http://arxiv.org/abs/1304.5484
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