Red dwarf mass-radius data from eclipsing binaries combined with dark-photon-inclusive evolution simulations produce competitive constraints on light dark photons.
Constraining the Axion-Photon Coupling with Massive Stars
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abstract
We point out that stars in the mass window ~ 8-12 Msun can serve as sensitive probes of the axion-photon interaction, g_{A\gamma\gamma}. Specifically, for these stars axion energy losses from the helium-burning core would shorten and eventually eliminate the blue loop phase of the evolution. This would contradict observational data, since the blue loops are required, e.g., to account for the existence of Cepheid stars. Using the MESA stellar evolution code, modified to include the extra cooling, we conservatively find g_{A\gamma\gamma} <~ 0.8 * 10^{-10} GeV^{-1}, which compares favorably with the existing bounds.
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ALP-assisted first-order phase transitions can explain observed intergalactic magnetic fields and produce detectable gravitational waves, linking cosmology with particle physics searches.
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Dark Photons from Red Dwarfs
Red dwarf mass-radius data from eclipsing binaries combined with dark-photon-inclusive evolution simulations produce competitive constraints on light dark photons.
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Primordial Magnetogenesis and Gravitational Waves from ALP-assisted Phase Transition
ALP-assisted first-order phase transitions can explain observed intergalactic magnetic fields and produce detectable gravitational waves, linking cosmology with particle physics searches.