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11 papers · 1 filter
estimates for overdetermined Radon transforms
Luca Brandolini, Allan Greenleaf, Giancarlo Travaglini
We prove several variations on the results of Ricci and Travaglini concerning bounds for convolution with all rotations of a measure supported by a fixed convex curve in the plane.…
Variational ansatz for gaussian + Yang-Mills two matrix model compared with Monte-Carlo simulations in 't Hooft limit
G. S. Krishnaswami
In recent work, we have developed a variational principle for large N multi-matrix models based on the extremization of non-commutative entropy. Here, we test the simplest variatio…
Clumpy Flows in Protoplanetary and Planetary Nebulae
A. Y. Poludnenko, A. Frank, S. Mitran
Many astrophysical flows occur in inhomogeneous media. We briefly discuss some general properties of the adiabatic and radiative inhomogeneous systems and discuss the relevance of…
Limitations of the Hamiltonian Treatment for Collisionless Astrophysical Accretion Flows
Vladimir I. Pariev, Eric G. Blackman
In the Hamiltonian treatment of purely mechanical systems, the canonical and actual momentum of a particle are the same. In contrast, for a plasma of charged particles and electrom…
Dynamo-Driven Outflows in Pre-Planetary Nebulae
Eric G. Blackman
The plethora of asymmetric planetary nebulae and the curiously high momenta of pre-planetary nebula outflows suggest that rotational energy is extracted from the engines. Magneto-r…
Electromagnetic Mechanism for the Origin of Knots in Parsec Scale Jets
V. I. Pariev, Ya. N. Istomin, A. R. Beresnyak
We consider the propagation and stability of the helical electromagnetic perturbations in a relativistic force-free Pointing flux dominated jet (magnetic helix). Perturbations are…