Millicharged relics reveal massless dark photons

Berlin, Asher; Dror, Jeff A.; Gan, Xucheng; Ruderman, Joshua T.

doi:10.1007/jhep05(2023)046

Cited by 11 publications

(1 citation statement)

References 82 publications

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“…In a similar vein, one might consider a recoupling to a radiation bath via a long-range interaction. For instance, if the dark sector consists of a massive particle χ coupled to a light dark photon A ′ that kinetically mixes with the Standard Model (SM) photon γ, resonant transitions between γ and A ′ are possible [101]. In this case, the SM and dark sectors are kept in equilibrium at early times before eventually decoupling.…”

Section: Classes Of Recoupling Scenariosmentioning

confidence: 99%

Kinetic recoupling of dark matter

Lehmann,

Morrison,

Profumo

et al. 2024

J. Cosmol. Astropart. Phys.

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We study the possibility that dark matter re-enters kinetic equilibrium with a radiation bath after kinetic decoupling, a scenario we dub kinetic recoupling. This naturally occurs, for instance, with certain types of resonantly-enhanced interactions, or as the result of a phase transition. While late kinetic decoupling damps structure on small scales below a cutoff, kinetic recoupling produces more complex changes in the power spectrum that depend on the nature and extent of the recoupling period. We explore the features that kinetic recoupling imprints upon the matter power spectrum, and discuss how such features can be traced to dark matter microphysics with future observations.

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Section: Classes Of Recoupling Scenariosmentioning

confidence: 99%

Kinetic recoupling of dark matter

Lehmann,

Morrison,

Profumo

et al. 2024

J. Cosmol. Astropart. Phys.

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CMB spectral distortions from an axion-dark photon-photon interaction

Hook,

Marques-Tavares,

Ristow

2024

J. High Energ. Phys.

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The presence of a plethora of light spin 0 and spin 1 fields is motivated in a number of BSM scenarios, such as the axiverse. The study of the interactions of such light bosonic fields with the Standard Model has focused mostly on interactions involving only one such field, such as the axion (ϕ) coupling to photons, $$\phi F\widetilde{F}$$, or the kinetic mixing between photon and the dark photon, FFD. In this work, we continue the exploration of interactions involving two light BSM fields and the standard model, focusing on the mixed axion-photon-dark-photon interaction $$\phi F{\widetilde{F}}_{D}$$. If either the axion or dark photon are dark matter, we show that this interaction leads to conversion of the CMB photons into a dark sector particle, leading to a distortion in the CMB spectrum. We present the details of these unique distortion signatures and the resulting constraints on the $$\phi F{\widetilde{F}}_{D}$$ coupling. In particular, we find that for a wide range of masses, the constraints from these effect are stronger than on the more widely studied axion-photon coupling.

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Signals of millicharged dark matter in light-shining-through-wall experiments

Berlin,

D’Agnolo,

Ellis

et al. 2023

J. High Energ. Phys.

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We discuss a novel detection technique for millicharged dark matter that makes use of existing light-shining-through-wall (LSW) experiments searching for massive dark photons. Since millicharged particles interact with both the visible and dark sectors, a small background of such particles enables the search for visible signals even in the limit of a massless dark photon. Furthermore, for sufficiently large couplings, a small dark matter subcomponent consisting of millicharged particles can have a terrestrial abundance that is significantly enhanced with respect to its galactic abundance. We leverage this fact to show that in certain parts of parameter space, future runs of the LSW Dark SRF experiment can be used to set the strongest limits on millicharged relics.

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Millicharged relics reveal massless dark photons

Cited by 11 publications

References 82 publications

Kinetic recoupling of dark matter

Kinetic recoupling of dark matter

CMB spectral distortions from an axion-dark photon-photon interaction

Signals of millicharged dark matter in light-shining-through-wall experiments

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