Electromagnetic waves propagating in the string axiverse

Abstract

It is widely believed that axions are ubiquitous in string theory and could be the dark matter. The peculiar features of the axion dark matter are coherent oscillations and a coupling to the electromagnetic field through the Chern-Simons term. In this paper, we study consequences of these two features of the axion with the mass in a range from $10^{-13}\mathrm{eV}$ to $10^3\mathrm{eV}$. First, we study the parametric resonance of electromagnetic waves induced by the coherent oscillation of the axion. As a result of the resonance, the amplitude of the electromagnetic waves is enhanced and the circularly polarized monochromatic waves will be generated. Second, we study the velocity of light in the background of the axion dark matter. In the presence of the Chern-Simons term, the dispersion relation is modified and the speed of light will oscillate in time. It turns out that the change of speed of light would be difficult to observe. We argue that the future radio wave observations of the resonance can give rise to a stronger constraint on the coupling constant and/or the density of the axion dark matter.

arXiv comment5 pages

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Cited by in corpus (13)

• On the Wondrous Stability of ALP Dark Matter
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• How to suppress exponential growth -- on the parametric resonance of photons in an axion background
• Constraining the gravitational coupling of axion dark matter at LIGO
• Gravitational waves and neutrino oscillations in Chern-Simons axion gravity
• Hidden Photon Dark Matter Interacting via Axion-like Particles
• Gravitational Waves and Possible Fast Radio Bursts from Axion Clumps
• Stability of Axion Dark Matter-Photon Conversion
• Challenging the Stability of Light Millicharged Dark Matter
• Time-domain properties of electromagnetic signals in a dynamical axion background
• Identifying $\alpha$-cluster configurations in ${}^{20}$Ne via ultracentral Ne+Ne Collisions
• Parity violation in photon quasinormal modes of black holes
• Parametric resonance in abelian and non-abelian gauge fields via space-time oscillations