  The theory of highly super-Eddington black hole accretion was developed in
the 1980s in Warsaw by Paczynski and his collaborators in terms of "Polish
doughnuts", i.e. low viscosity, rotating accretion flows that are optically
thick, radiation pressure supported, cooled by advection, and radiatively very
inefficient. Polish doughnuts resemble fat tori with two narrow funnels along
rotation axis. The funnels collimate radiation into beams with highly
super-Eddington luminosities. "Slim disks" introduced later by Abramowicz,
Lasota and collaborators, have only moderately super-Eddington accretion rates,
rather disk-like shapes, and almost thermal spectra.
