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Scientists Run First Full-GR Radiation-Transport Simulations of Luminous Black Hole Accretion

New radiation-transport algorithms running on exascale machines enabled a full general-relativistic treatment of luminous accretion.

Overview

  • Researchers from the Institute for Advanced Study and the Flatiron Institute published the work on December 3, 2025 in The Astrophysical Journal as the first paper in a planned series.
  • The models target stellar-mass black holes and captured radiation-dominated turbulent disks, powerful winds, and occasional jets.
  • Computed spectra from the simulations closely matched observations across systems such as ultraluminous X-ray sources and X-ray binaries.
  • The method employs an angle-dependent radiation algorithm in full general relativity, designed by Christopher White, implemented by Patrick Mullen in the AthenaK code, and built on Yan-Fei Jiang’s prior work.
  • Large-scale runs on the Frontier and Aurora supercomputers made the calculations possible, and the results support testing the idea that some JWST “little red dots” could be super-Eddington accretors.