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   Anchordoqui, Luis A.; Antoniadis, Ignatios; Lüst, Dieter (March 2024, The European Physical Journal C)

   Abstract We propose a new dark matter contender within the context of the so-called “dark dimension”, an innovative 5-dimensional construct that has a compact space with characteristic length-scale in the micron range. The new dark matter candidate is the radion, a bulk scalar field whose quintessence-like potential drives an inflationary phase described by a 5-dimensional de Sitter (or approximate) solution of Einstein equations. We show that the radion could be ultralight and thereby serve as a fuzzy dark matter candidate. We advocate a simple cosmological production mechanism bringing into play unstable Kaluza–Klein graviton towers which are fueled by the decay of the inflaton. 

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2. The Dark Arctic

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   Bennett, Mia M (January 2024, Current History)

   The snow-white Arctic is darkening physically and economically. Climate change is turning frozen seas into open water and blackening snow and ice as soot spreads and algae propagates. At the same time, the region’s shadow economy is expanding. Illicit activities like human trafficking and fishing have long thrived in northern peripheries beyond state reach, while Russia’s transition to capitalism in the 1990s institutionalized the black market. The invasion of Ukraine further tightened ties between Russian Arctic resource development and criminal underworlds. With the Kremlin continuing northern extraction to fund the war and circumpolar diplomacy fracturing, the entire region is at risk of environmental and geopolitical degradation. 

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3. The dark universe: Primordial black hole ⇋ dark graviton gas connection

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4. Atomic dark matter, interacting dark radiation, and the Hubble tension

   https://doi.org/10.1007/JHEP07(2025)084  

   Buen-Abad, Manuel A; Chacko, Zackaria; Flood, Ina; Kilic, Can; Marques-Tavares, Gustavo; Youn, Taewook (July 2025, Journal of High Energy Physics)

   A<sc>bstract</sc> We present a new class of interacting dark sector models that can address the Hubble tension. Interacting dark radiation (DR) has previously been put forward as a solution to the problem, but this proposal is disfavored by the high-ℓcosmic microwave background (CMB) data. We modify this basic framework by introducing a subcomponent of dark matter (DM) that interacts strongly with the DR, so that together they constitute a tightly coupled fluid at early times. We show that if this subcomponent decouples from the interacting DR during the CMB epoch, theℓmodes of the CMB that entered the horizon before decoupling are impacted differently from those that entered after, allowing a solution to the problem. We present a model that realizes this framework, which we dub “New Atomic Dark Matter”, or nuADaM, in which the interacting dark matter (iDM) subcomponent is composed of dark atoms, and dark “neutrinos” with long-range interactions contribute to the DR, hence the name of the model. This iDM subcomponent is acoustic at early times but decouples from the DR following dark recombination. In contrast to conventional atomic dark matter (ADM) models, the dark photon is part of a richer DR sector, which ensures that it continues to be self-interacting even after recombination. We show that this model admits a significantly larger value ofH₀than ΛCDM when fit to CMB and BAO data, while maintaining a comparable goodness of fit. Once the SHOES data set is included, it provides a significantly better fit than ΛCDM. 

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5. The Earth as a transducer for dark-photon dark-matter detection

   Fedderke, Michael A.; Graham, Peter; Jackson Kimball, Derek F.; Kalia, Saarik (May 2021, ArXivorg)

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