Retrograde versus Prograde Models of Accreting Black Holes

Retrograde versus Prograde Models of Accreting Black Holes

Hyper-accreting black holes

Hyper-accretion disks are short-lived, powerful sources of neutrinos and magnetized jets. Such disks are plausible sources of gamma-ray bursts. This review describes the disk structure, the neutrino conversion to electron-positron plasma around the disk, and the post-burst evolution.

Advection-Dominated Models of Luminous Accreting Black Holes

It has been found that a class of optically-thin two-temperature advection-dominated accretion solutions explains many observations of low-luminosity accreting black holes. Here it is shown that these models give a satisfactory description also of higher luminosity systems, provided the viscosity parameter is large. The models reproduce the spectra of black hole X-ray binaries in the Low State,...

Mergers of accreting stellar-mass black holes

We present post-Newtonian N -body simulations on mergers of accreting stellarmass black holes (BHs), where such general relativistic effects as the pericentre shift and gravitational wave emission are taken into consideration. To elucidate the key physics that regulates mergers of BHs, the dynamical friction and the mass accretion by ambient gas are incorporated. We consider a system composed o...

Spacetime constraints on accreting black holes

We study the spin dependence of accretion onto rotating Kerr black holes using analytic techniques. In its linear regime, angular momentum transport in MHD turbulent accretion flow involves the generation of radial magnetic field connecting plasma in a differentially rotating flow. We take a first principles approach, highlighting the constraint that limits the generation and amplification of r...