Disc tearing leads to low and high frequency quasi-periodic oscillations in a GRMHD simulation of a thin accretion disc

Black hole X-ray binaries (BHXRBs) display a wide range of variability phenomena, from long duration spectral state changes to short-term broadband and quasi-periodic oscillations (QPOs). A particularly puzzling aspect is the production QPOs, which -- if properly understood could be used as powerful diagnostic tool black accretion evolution. In this work we analyse high resolution three-dimensional general relativistic magnetohydrodynamic simulation geometrically thin disk tilted by $65^{\circ}$ with respect spin axis. We find that Lense-Thirring torque rapidly spinning 10 $M_\odot$ causes several sub-disks tear off within $\sim 10-20$ gravitational radii. Tearing occurs in cycles on timescales seconds. During each tearing cycle inner sub-disk precesses for 1-5 periods before it falls into hole. precession frequency 3\rm Hz$, consistent observed low-frequency QPOs. addition, QPO (HFQPO) centroid $\sim55$Hz power spectra mass-weighted radius disk. This signal caused radial epicyclic dense ring gas at radius, strongly suggests corresponding modulation lightcurve may thus explain some HFQPOs.