Photon trapping occurs when the radiative diffusion time across an optically thick flow exceeds its inward advection time. The trapped radiation is carried inward, reducing the emergent radiative efficiency.
The photon-trapping radius is where the outward radiative diffusion time equals the inward inflow time. Radiation generated inside it is predominantly advected toward the accretor.

Ancestors (8)

  1. Slim accretion disk
  2. Radiatively inefficient accretion flow
  3. Black-hole accretion
  4. Astrophysical black hole
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