Dynamics of magnetoviscous warped discs around compact objects
arXiv:2601.22683 · doi:10.1103/mj63-ffjf
Abstract
Accretion discs that are tilted with respect to their compact hosts can warp out-of-plane through general relativistic frame-dragging. Warp influences disc dynamics in ways that have been studied extensively, especially as regards instabilities that might lead to rapid angular-momentum cancellation between neighboring rings of fluid and mass infall. We provide a review of warped-disc phenomena here, revisiting key hydrodynamical assumptions that impact calculations of the shear viscosity controlling instability thresholds. Relativistic effects at the level of gas-parcel orbits are included, as are external Lorentz forces applied by the compact primary's magnetic field. Semianalytic analysis reveals that intense magnetic fields can bring about new branches of warp modes and avoided crossings that significantly reduce the perpendicular viscosity at sub-Eddington accretion rates. Critical strengths required for misaligned torques to tear a thin disc may thus relax for systems like neutron star X-ray binaries or radio-loud active galactic nuclei.
24 pages, 12 figures, 1 table. PRD in press; minor changes to title to match journal style, and final typos corrected
References in corpus (67)
- General Relativistic Magnetohydrodynamic Simulations of Magnetically Choked Accretion Flows around Black Holes
- Magnetically Arrested Disk: An Energetically Efficient Accretion Flow
- Accretion disc viscosity: how big is alpha?
- The disc instability model for X-ray transients: evidence for truncation and irradiation
- Nine-hour X-ray quasi-periodic eruptions from a low-mass black hole galactic nucleus
- Confirmation and refutation of very luminous galaxies in the early universe
- On the diffusive propagation of warps in thin accretion discs
- A Helical Magnetic Field in the Jet of 3C 273
- Polarized x-rays constrain the disk-jet geometry in the black hole x-ray binary Cygnus X-1
- A radio transient with unusually slow periodic emission
- Global MHD simulations of stratified and turbulent protoplanetary discs. I. Model properties
- On the Bardeen-Petterson Effect in black hole accretion discs
- Tearing up the disc: how black holes accrete
- An exact analytic treatment of propagating mass accretion rate fluctuations in X-ray binaries
- Warp diffusion in accretion discs: a numerical investigation
- NICER and Fermi GBM Observations of the First Galactic Ultraluminous X-ray Pulsar Swift J0243.6+6124
- How Do Z and Atoll X-ray Binaries Differ?
- Disc Tearing and Bardeen-Petterson Alignment in GRMHD Simulations of Highly Tilted Thin Accretion Discs
- The Spin Distribution of Fast Spinning Neutron Stars in Low Mass X-Ray Binaries: Evidence for Two Sub-Populations
- Precessing jet nozzle connecting to a spinning black hole in M87
- Accreting millisecond pulsar SAX J1808.4-3658 during its 2002 outburst: evidence for a receding disc
- XMM-Newton detects a relativistically broadened iron line in the spectrum of the ms X-ray pulsar SAX J1808.4-3658
- Disc tearing: implications for black hole accretion and AGN variability
- A decade of timing an accretion-powered millisecond pulsar: The continuing spin down and orbital evolution of SAX J1808.4-3658
- Tearing up a misaligned accretion disc with a binary companion
- Broken discs: warp propagation in accretion discs
- Dynamics of warped accretion discs
- Determination of X-ray pulsar geometry with IXPE polarimetry
- A disk instability model for the quasi-periodic eruptions of GSN 069
- Magnetically Dominated Disks in Tidal Disruption Events and Quasi-Periodic Eruptions
- Insight-HXMT discovery of the highest energy CRSF from the first Galactic ultra-luminous X-ray pulsar Swift J0243.6+6124
- Orbit and intrinsic spin-up of the newly discovered transient X-ray pulsar Swift J0243.6+6124
- Local and global dynamics of warped astrophysical discs
- Super-Eddington accretion onto a magnetized neutron star
- Constraints on AGN accretion disc viscosity derived from continuum variability
- On the timing properties of SAX J1808.4-3658 during its 2015 outburst
- Mining the Aql X-1 long term X-ray light curve
- Super-Eddington accretion onto the Galactic ultraluminous X-ray pulsar Swift J0243.6+6124
- Instability of warped discs
- All at once: transient pulsations, spin down and a glitch from the Pulsating Ultraluminous X-ray Source M82 X-2
- Disc tearing: numerical investigation of warped disc instability
- Radiation Transport Two-Temperature GRMHD Simulations of Warped Accretion Disks
- Source to Accretion Disk Tilt
- The evolving jet spectrum of the neutron star X-ray binary Aql X-1 in transitional states during its 2016 outburst
- Recycled pulsars with multipolar magnetospheres from accretion-induced magnetic burial
- Matter ejections behind the highs and lows of the transitional millisecond pulsar PSR J1023+0038
- An accurate metric for the spacetime around neutron stars
- Evolutionary implications of a magnetar interpretation for GLEAM-X J162759.5-523504.3
- Models of Ultra-Luminous X-ray transient sources
- Simultaneous NICER and NuSTAR Observations of the Ultra-compact X-ray Binary 4U 1543-624
- On the equations of warped disc dynamics
- Accretion disc viscosity: a limit on the anisotropy
- The Chaotic Long-term X-ray Variability of 4U 1705--44
- A local model of warped magnetised accretion discs
- Polarization Observations of AGN Jets: Past and Future
- Relaxation by thermal conduction of a magnetically confined mountain on an accreting neutron star
- Modelling spin-up episodes in accreting millisecond X-ray pulsars
- Catalog of outbursts of neutron star LMXBs
- Primordial Black-Hole-Based Pathways to Little Red Dots
- Timing analysis of Swift J0243.6+6124 with NICER and Fermi/GBM during the decay phase of the 2017-2018 outburst
- Jet Tilt Instability from Stream-Disk Interactions in MAD Disks
- Turbulent protostellar discs
- General-relativistic magnetar magnetospheres in 3D with physics-informed neural networks
- Revealing the nature of long-period transients with space-based gravitational-wave interferometers
- Typical X-ray Outburst Light Curves of Aql X-1
- Impact of magnetic field gradients on the development of the MRI: Applications to binary neutron star mergers and proto-planetary disks
- A Detailed Spectral Study of Intermittent-Accreting Millisecond X-ray Pulsar Aql X-1 during Pulse-on and Pulse-off Stages