A no-go theorem shows that negative effective mass squared for the vector field in vector-tensor gravity always accompanies ghost or gradient instabilities, blocking spontaneous vectorization in stationary axisymmetric black holes.
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Dark Light, Dark Matter and the Misalignment Mechanism
Canonical reference. 83% of citing Pith papers cite this work as background.
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abstract
We explore the possibility that the dark matter is a condensate of a very light vector boson. Such a condensate could be produced during inflation, provided the vector mass arises via the Steuckelberg mechanism. We derive bounds on the kinetic mixing of the dark matter boson with the photon, and point out several potential signatures of this model.
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A novel waveguide haloscope concept using near-cutoff slow-wave response for sub-meV bosonic dark matter, projecting dark photon sensitivity of ε≈2.1×10^{-15} at 0.1 meV.
A covariant non-canonical kinetic term formulation for two U(1) models yields simple two-loop MSbar RGEs and reparametrization-invariant quantities linked to millicharges.
New upper limits on the dark photon kinetic mixing parameter ε are derived from geomagnetic data for masses between 1e-15 and 2e-13 eV, improving prior ground-based constraints.
Planck CMB data set upper limits on vector and axial-vector dark matter-electron couplings for masses 100 eV to 100 keV via energy injection from inelastic scattering and hydrogen absorption.
Post-inflationary axion-SU(2) vector dark matter production is recast as a quantum quench with a survival factor that induces an O(1) renormalization of the standard relic abundance.
Sequential freeze-in dark matter with a dark photon mediator of mass 0.01-10 GeV fixes the dark charge at 1.3e-12 and restricts mixing to 10^{-11} to ~10^{-8}, with SHiP excluding most of this range except near 10^{-11}.
Model-independent forecasts for the stochastic gravitational-wave background from ultralight dark matter decaying into gravitons and the sensitivity of current and future detectors to this signal.
This work sets new upper limits on decay lifetimes and couplings for axion-like particles, dark photons, scalars, and B-L or L_i-L_j vector bosons using 511 keV line, X-ray continuum, and cosmic-ray flux observations.
Systematic study of scalar and vector ULDM interactions on long-baseline neutrino oscillations finds order-of-magnitude weaker constraints for m_φ ≲ 10^{-17} eV due to stochastic effects, with combined T2K+NOvA data showing no alleviation of δ_CP discrepancy.
Incorporating timing information from time-dependent new physics signals can improve LHC search sensitivity by up to a factor of two compared to standard time-invariant analyses.
Resonant dilatonic coupling produces ultralight vector dark matter with relic mass scaling as m_γ' ∝ r_i^{-2} for subdominant spectators in radiation-dominated backgrounds.
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-charged fermion constraints.
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CMB Limits on the Absorption of Light Vector and Axial-Vector Dark Matter
Planck CMB data set upper limits on vector and axial-vector dark matter-electron couplings for masses 100 eV to 100 keV via energy injection from inelastic scattering and hydrogen absorption.