A slim accretion disk is an optically thick, moderately geometrically thick flow at a high accretion rate. Its inflow time can be shorter than its photon-diffusion time, so radial advection carries trapped radiation inward.
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.

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  1. Radiatively inefficient accretion flow
  2. Black-hole accretion
  3. Astrophysical black hole
  4. Astrophysics
  5. Branch of physics
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