Abstract
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 ≲ \U0001d4aa(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 ≈ \U0001d4aa (10−14 GeV−1), two orders of magnitude stronger than the currently strongest limits in this mass range.
Highlights
In this chapter, we derive an expression for the conversion probability from photons to Axion-like particles (ALPs) and compare the corresponding temperature change with observations of the thermal Sunyaev-Zeldovich effect
We compared the temperature change due to the thermal Sunyaev-Zeldovich (tSZ)-effect of the CMB photons reaching us from galaxy clusters with the temperature change due to resonant photon-ALP conversion
Photon-ALP conversion is most effective at resonance where it leads to the strongest limits on the coupling constant
Summary
We derive an expression for the conversion probability from photons to ALPs and compare the corresponding temperature change with observations of the thermal Sunyaev-Zeldovich effect. Using suitable models for the profile of galaxy clusters, we determine upper limits for the coupling constant between photons and ALPs
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