22 citations
6 papers
Bounds for the -chromatic number of some families of graphs
Mekkia Kouider, Manouchehr Zaker
In this paper we obtain some upper bounds for -chromatic number of -free graphs, graphs with given minimum clique partition and bipartite graphs. These bounds are in t…
QPOs and firehose instabilities in neutron star magnetospheres in accreting systems
Vahid Rezania, John C. Samson
We show that the interaction of an accretion disk with the magnetosphere of a neutron star can excite resonant shear Alfven waves with Hz-kHz frequencies in a region of enhanced de…
A symmetric treatment of damped harmonic oscillator in extended phase space
S. Nasiri, H. Safari
Extended phase space (EPS) formulation of quantum statistical mechanics treats the ordinary phase space coordinates on the same footing and thereby permits the definite the canonic…
Photon Channelling in Foams
Michael Schmiedeberg, MirFaez Miri, Holger Stark
Experiments by Gittings, Bandyopadhyay, and Durian [Europhys. Lett.\ \textbf{65}, 414 (2004)] demonstrate that light possesses a higher probability to propagate in the liquid phase…
Quasi-periodic oscillations: Resonant shear Alfv`en waves in neutron star magnetospheres
Vahid Rezania, John C. Samson
In this paper we propose a new model for quasi-periodic oscillations (QPOs) based on oscillating magnetohydrodynamic modes in neutron star magnetospheres. We argue that the interac…
Comments on the Quantum Vacuum and the Light Acceleration
Nosratollah Jafari, Ahmad Shariati
The recent observations on the far quasars absorption lines spectra and comparison of these lines with laboratory ones provide a framework for explantation of these observations by…