Probing the longest dark matter lifetimes with the Line Emission Mapper

Krnjaic, Gordan; Pinetti, Elena

doi:10.1103/physrevd.109.095027

Phys. Rev. D

2024

DOI: 10.1103/physrevd.109.095027

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Probing the longest dark matter lifetimes with the Line Emission Mapper

Gordan Krnjaic,

Elena Pinetti

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Glimmers from the axiverse

Gendler,

Marsh,

McAllister

et al. 2024

J. Cosmol. Astropart. Phys.

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We study axion-photon couplings in compactifications of type IIB string theory. We find that these couplings are systematically suppressed compared to the inverse axion periodicity, as a result of two effects. First, couplings to the QED theta angle are suppressed for axion mass eigenstates that are light compared to the mass scale set by stringy instantons on the cycle supporting QED. Second, in compactifications with many axions the intersection matrix is sparse, making kinetic mixing weak. We study the resulting phenomenology in an ensemble of 200,000 toy models constructed from the Kreuzer-Skarke database up to the maximum Hodge number h1,1 = 491. We examine freeze-in production and decay of thermal axions, birefringence of the cosmic microwave background, X-ray spectrum oscillations, and constraints on the QCD axion from supernovae. We conclude that compactifications in this corner of the landscape involve many invisible axions, as well as a handful that may be detectable via photon couplings.

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Glimmers from the axiverse

Gendler,

Marsh,

McAllister

et al. 2024

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

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Probing the longest dark matter lifetimes with the Line Emission Mapper

Cited by 1 publication

References 23 publications

Glimmers from the axiverse

Glimmers from the axiverse

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