Inertia of Heat in Advective Accretion Disks around Kerr Black Holes

Accretion Disks around Kerr Black Holes: Vertical Equilibrium Revisited

We re-derive the equation for vertical hydrodynamical equilibrium of stationary thin and slim accretion disks in the Kerr spacetime. All the previous derivations have been unsatisfactory, yielding unphysical singularities. Our equation is non-singular, more general, and simpler than those previously derived. Subject headings: accretion, accretion disks — black hole physics — hydrodynamics — rel...

Sporadically Torqued Accretion Disks Around Black Holes

The assumption that black hole accretion disks possess an untorqued inner boundary, the so-called zero torque boundary condition, has been employed by models of black hole disks for many years. However, recent theoretical and observational work suggests that magnetic forces may appreciably torque the inner disk. This raises the question of the effect that a time-changing magnetic torque may hav...

Nucleosynthesis in Advective Accretion Disks around Galactic and Extra-galactic Black Holes

Many of the observational evidences for black hole rely on the fact that the incoming gas has the potential to become as hot as its virial temperature Tvirial ∼ 10 13 K (Rees, 1984). This flow is usually cooled down through bremsstrahlung and Comptonization effects and hard and soft states are produced depending on the degree by which this cooling takes place (Chakrabarti & Titarchuk, 1995). Th...

Computation of Mass-outflow Rates from Advective Accretion Disks around Black Holes

Physics Fundamentals of Luminous Accretion Disks around Black Holes

These lectures provide an overview of the theory of accretion disks with application to bright sources containing black holes. I focus on the fundamental physics of these flows, stressing modern developments and outstanding questions wherever possible. After a review of standard Shakura-Sunyaev based models and their problems and uncertainties, I describe the basic principles that determine the...