504 citations · 5.2k across the 62 of their papers we have counts for
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astro-ph.HE2012★ 89 cited
The Shakura-Sunyaev Viscosity Prescription with Variable alpha(r)
Robert F. Penna, Aleksander Sadowski, Akshay K. Kulkarni +1
Almost all hydrodynamic accretion disk models parametrize viscosity with the dimensionless parameter alpha. There is no detailed model for alpha, so it is usually taken to be a con…
astro-ph.HE2012★ 504 cited
GRMHD Simulations of Magnetized Advection Dominated Accretion on a Non-Spinning Black Hole: Role of Outflows
Ramesh Narayan, Aleksander Sadowski, Robert F. Penna +1
We present results from two long-duration GRMHD simulations of advection-dominated accretion around a non-spinning black hole. The first simulation was designed to avoid significan…