Testing global-monopole gravity with shock-cone QPOs and mass estimates of Seyfert black holes — E8 Intelligence Research

We investigate the accretion dynamics produced by Bondi-Hoyle-Lyttleton (BHL) accretion onto a black hole with a global monopole by solving the general relativistic hydrodynamic (GRH) equations on a fixed global-monopole spacetime background. Using a controlled sequence of models, we reveal how the monopole parameters η and λ affect the shock-cone morphology formed around the black hole, the near-horizon density distribution, the variation of the mass-accretion rate, and the QPO-like timing signatures. The numerical results show that increasing the monopole deviation systematically transforms the narrow Schwarzschild-type shock cone into a broad bow-shock-like structure. During this process, the matter trapped inside the shock cone is redistributed over a wider angular region, and the accretion dynamics is strongly modified. The mass-accretion-rate evolution further reveals that strong monopole deviations enhance long-timescale variability, especially in the MOPO10 and MOPO12 models. T Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com