A model for pseudo-scalar dark matter is built from a broken dark U(1)_X gauge symmetry without dark fermions, yielding a stable pseudo-NGB with suppressed direct detection and viable relic density via annihilations into SM particles or light scalars.
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N-body simulations of a massive binary black hole in Leo I find orbital hardening to 1 pc followed by stalling due to the final parsec problem, with merger unlikely in a Hubble time owing to low stellar and dark matter densities.
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Pseudo-scalar dark matter from a broken gauged symmetry
A model for pseudo-scalar dark matter is built from a broken dark U(1)_X gauge symmetry without dark fermions, yielding a stable pseudo-NGB with suppressed direct detection and viable relic density via annihilations into SM particles or light scalars.
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Dark Matter's influence on Evolution of MBHB in Dwarf Galaxies: A Case Study of Leo I dSph
N-body simulations of a massive binary black hole in Leo I find orbital hardening to 1 pc followed by stalling due to the final parsec problem, with merger unlikely in a Hubble time owing to low stellar and dark matter densities.