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Cosmological Constraints on Very Dark Photons
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abstract
We explore the cosmological consequences of kinetically mixed dark photons with a mass between 1 MeV and 10 GeV, and an effective electromagnetic fine structure constant as small as $10^{-38}$. We calculate the freeze-in abundance of these dark photons in the early Universe and explore the impact of late decays on BBN and the CMB. This leads to new constraints on the parameter space of mass $m_V$ vs kinetic mixing parameter $\kappa$.
Forward citations
Cited by 7 Pith papers
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Theoretical uncertainties in reconstructing model parameters with gravitational waves from supercooled phase transitions
In the conformal U(1)_X model, the daisy-resummed nucleation scheme shifts LISA-reconstructed gauge couplings by O(10%) relative to the NLO effective-field-theory result, an order of magnitude above the Fisher-matrix ...
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Dark Photons in the Early Universe: From Thermal Production to Cosmological Constraints
Dark photon thermal production is computed analytically, yielding a fixed 4πe/27 ≈ 0.14 resonance-to-inverse-decay ratio and new cosmological limits down to ε~10^-12 over 0.1–6 MeV.
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Vector dark matter with non-abelian kinetic mixing
A four-boson dark sector with one non-abelian kinetic-mixing operator can produce the observed dark-matter abundance by freeze-out, freeze-in, or 3-to-2 annihilations, with a dark-photon mediator almost degenerate wit...
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A critical look at low-scale cosmological phase transitions in the PTA era
Precision study of dark sector phase transitions finds PTA-favored parameters near EFT breakdown with disfavored GW signals after higher-order corrections.
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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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Bipartite Solution to the Lithium Problem
A sequential majoron-to-neutrinos decay followed by axion-like particle-to-photons decay can lower primordial lithium without exceeding deuterium limits.
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The Dark Photon
The paper surveys theoretical motivations, experimental searches, and bounds on the dark photon as a kinetically mixed gauge boson from a dark sector, covering both massive and massless cases along with related milli-...
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