Constraining ALP-photon coupling using galaxy clusters

Martin Schlederer (II. Institut für theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany) ; Günter Sigl (II. Institut für theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany)

We study photon-ALP conversion by resonance effects in the magnetized plasma of galaxy clusters and compare the predicted distortion of the cosmic microwave background spectrum in the direction of such objects to measurements of the thermal Sunyaev-Zeldovich effect. Using galaxy cluster models based on current knowledge, we obtain upper limits on the photon-ALP coupling constant g of ≲ 𝒪(10−11 GeV−1). The constraints apply to the mass range of 2 · 10−14 eV ≲ mALP ≲ 3 · 10−12 eV in which resonant photon-ALP conversions can occur. These limits are slightly stronger than current limits, and furthermore provide an independent constraint. We find that a next generation PRISM-like experiment would allow limits down to g ≈ 𝒪 (10−14 GeV−1), two orders of magnitude stronger than the currently strongest limits in this mass range.

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      "title": "Constraining ALP-photon coupling using galaxy clusters"
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      "value": "We study photon-ALP conversion by resonance effects in the magnetized plasma of galaxy clusters and compare the predicted distortion of the cosmic microwave background spectrum in the direction of such objects to measurements of the thermal Sunyaev-Zeldovich effect. Using galaxy cluster models based on current knowledge, we obtain upper limits on the photon-ALP coupling constant g of \u00e2\u0089\u00b2\u00c2 \u00f0\u009d\u0092\u00aa(10\u00e2\u0088\u009211 GeV\u00e2\u0088\u00921). The constraints apply to the mass range of 2\u00c2 \u00c2\u00b7\u00c2 10\u00e2\u0088\u009214 eV \u00e2\u0089\u00b2\u00c2 mALP\u00c2 \u00e2\u0089\u00b2\u00c2 3\u00c2 \u00c2\u00b7\u00c2 10\u00e2\u0088\u009212 eV in which resonant photon-ALP conversions can occur. These limits are slightly stronger than current limits, and furthermore provide an independent constraint. We find that a next generation PRISM-like experiment would allow limits down to g\u00c2 \u00e2\u0089\u0088\u00c2 \u00f0\u009d\u0092\u00aa\u00c2 (10\u00e2\u0088\u009214 GeV\u00e2\u0088\u00921), two orders of magnitude stronger than the currently strongest limits in this mass range."
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Published on:
21 January 2016
Publisher:
Institute of Physics Publishing/SISSA
Published in:
Journal of Cosmology and Astroparticle Physics (2016)
Issue 01
DOI:
https://doi.org/10.1088/1475-7516/2016/01/038
arXiv:
1507.02855
Copyrights:
No information available
Licence:
CC-BY-3.0

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