On a Light Spinless Particle Coupled to Photons

Abstract

A pseudoscalar or scalar particle $\varphi$ that couples to two photons but not to leptons, quarks and nucleons would have effects in most of the experiments searching for axions, since these are based on the $a\gamma \gamma$ coupling. We examine the laboratory, astrophysical and cosmological constraints on $\varphi$ and study whether it may constitute a substantial part of the dark matter. We also generalize the $\varphi$ interactions to possess $SU(2)\times U(1)$ gauge invariance, and analyze the phenomenological implications.

LaTex, 20p., 6 figures. Changes in sections 4, 5 and figure 2, our bounds are now more stringent. To be published in Physical Review D

References in corpus (1)

• Determination of pseudo-Goldstone boson-photon coupling by the differential time delay of pulsar signals

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