54 citations · 467 across the 45 of their papers we have counts for
4 papers · 1 filter
Casimir energy in finite expanding universes: a prelude
Sandro Silva e Costa, Reuven Opher
We present the Green's functions that are the solutions of the massive Klein-Gordon equation for a scalar field with non-minimal coupling to gravitation for several static and expa…
Global Alfven Wave Heating of the Magnetosphere of Young Stars
A. G. Elfimov, R. M. O. Galvao, V. Jatenco-Pereira +1
Excitation of a Global Alfven wave (GAW) is proposed as a viable mechanism to explain plasma heating in the magnetosphere of young stars. The wave and basic plasma parameters are c…
Casimir energy in multiply connected static hyperbolic Universes
D. Muller, H. V. Fagundes, R. Opher
We generalize a previously obtained result, for the case of a few other static hyperbolic universes with manifolds of nontrivial topology as spatial sections.
On the thickness of a mildly relativistic collisional shock wave
Jose A. S. Lima, Alejandra Kandus, Reuven Opher
We consider an imperfect relativistic fluid which develops a shock wave and discuss its structure and thickness, taking into account the effects of viscosity and heat conduction in…