257 citations · 1.7k across the 29 of their papers we have counts for
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A Turbulent Model of Gamma-Ray Burst Variability
Ramesh Narayan, Pawan Kumar
A popular paradigm to explain the rapid temporal variability observed in gamma-ray burst (GRB) lightcurves is the internal shock model. We propose an alternative model in which the…
Three-Dimensional Simulations of Magnetized Thin Accretion Disks around Black Holes: Stress in the Plunging Region
Rebecca Shafee, Jonathan C. McKinney, Ramesh Narayan +3
We describe three-dimensional general relativistic magnetohydrodynamic simulations of a geometrically thin accretion disk around a non-spinning black hole. The disk has a thickness…
Properties of Gamma-Ray Burst Progenitor Stars
Pawan Kumar, Ramesh Narayan, Jarrett L. Johnson
We determine some basic properties of stars that produce spectacular gamma-ray bursts at the end of their life. We assume that accretion of the outer portion of the stellar core by…
Mass Fall-back and Accretion in the Central Engine of Gamma-Ray Bursts
Pawan Kumar, Ramesh Narayan, Jarrett L. Johnson
We calculate the rate of in-fall of stellar matter on an accretion disk during the collapse of a rapidly rotating massive star, and estimate the luminosity of the relativistic jet…
Embedded Oscillating Starless Cores
Avery E. Broderick, Ramesh Narayan, Eric Keto +1
In a previous paper we demonstrated that non-radial hydrodynamic oscillations of a thermally-supported (Bonnor-Ebert) sphere embedded in a low-density, high-temperature medium pers…
Are Aryabhata's and Galilean Relativity Equivalent?
R. H. Narayan
This paper considers the question of whether Aryabhata's direct and indirect references to relativity of motion are equivalent to Galilean Relativity. Examining verses fom differen…