On String Theory Expectations for Photon Couplings to Axion-Like Particles. (arXiv:1909.05257v1 [hep-th])

<a href="http://arxiv.org/find/hep-th/1/au:+Halverson_J/0/1/0/all/0/1">James Halverson</a>, <a href="http://arxiv.org/find/hep-th/1/au:+Long_C/0/1/0/all/0/1">Cody Long</a>, <a href="http://arxiv.org/find/hep-th/1/au:+Nelson_B/0/1/0/all/0/1">Brent Nelson</a>, <a href="http://arxiv.org/find/hep-th/1/au:+Salinas_G/0/1/0/all/0/1">Gustavo Salinas</a>

ALP-photon couplings are modeled in large ensembles of string vacua and

random matrix theories. In all cases, the effective coupling increases

polynomially in the number of ALPs, of which hundreds or thousands are expected

in the string ensembles, many of which are ultralight. The expected value of

the couplings $g_{agammagamma}simeq 10^{-12}text{GeV}^{-1} –

10^{-10}text{GeV}^{-1}$ provide viable targets for future x-ray telescopes and

axion helioscopes, and in some cases are already in tension with existing data.

ALP-photon couplings are modeled in large ensembles of string vacua and

random matrix theories. In all cases, the effective coupling increases

polynomially in the number of ALPs, of which hundreds or thousands are expected

in the string ensembles, many of which are ultralight. The expected value of

the couplings $g_{agammagamma}simeq 10^{-12}text{GeV}^{-1} –

10^{-10}text{GeV}^{-1}$ provide viable targets for future x-ray telescopes and

axion helioscopes, and in some cases are already in tension with existing data.

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