504 citations · 2.7k across the 41 of their papers we have counts for
5 papers · 1 filter
A new equilibrium torus solution and GRMHD initial conditions
Robert F. Penna, Akshay Kulkarni, Ramesh Narayan
General relativistic magnetohydrodynamic (GRMHD) simulations are providing influential models for black hole spin measurements, gamma ray bursts, and supermassive black hole feedba…
Mapping our Universe in 3D with MITEoR
Haoxuan Zheng, Max Tegmark, Victor Buza +33
Mapping our universe in 3D by imaging the redshifted 21 cm line from neutral hydrogen has the potential to overtake the cosmic microwave background as our most powerful cosmologica…
Are entangled particles connected by wormholes? Support for the ER=EPR conjecture from entropy inequalities
Hrant Gharibyan, Robert F. Penna
If spacetime is built out of quantum bits, does the shape of space depend on how the bits are entangled? The ER=EPR conjecture relates the entanglement entropy of a collection of b…
General Relativistic Magnetohydrodynamic Simulations of Blandford-Znajek Jets and the Membrane Paradigm
Robert F. Penna, Ramesh Narayan, Aleksander Sadowski
Recently it has been observed that the scaling of jet power with black hole spin in galactic X-ray binaries is consistent with the predictions of the Blandford-Znajek (BZ) jet mode…
Energy, momentum and mass outflows and feedback from thick accretion discs around rotating black holes
A. Sadowski, R. Narayan, R. Penna +1
Using long-duration general relativistic magnetohydrodynamic simulations of radiatively inefficient accretion discs, the energy, momentum and mass outflow rates from such systems a…