Greybody factors for Proca fields in Schwarzschild spacetime are computed via decoupled master equations, revealing a low-mass regime in even-parity vector mode where transmission exceeds the massless case and lower transmission than massive scalars in the even-parity scalar mode.
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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.
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Greybody factors of Proca fields in Schwarzschild spacetime: A supplemental analysis based on decoupled master equations related to the Frolov-Krtou\v{s}-Kubiz\v{n}\'ak-Santos separation
Greybody factors for Proca fields in Schwarzschild spacetime are computed via decoupled master equations, revealing a low-mass regime in even-parity vector mode where transmission exceeds the massless case and lower transmission than massive scalars in the even-parity scalar mode.
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INTEGRAL, eROSITA and Voyager Constraints on Light Bosonic Dark Matter: ALPs, Dark Photons, Scalars, $B-L$ and $L_{i}-L_{j}$ Vectors
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.