| Journal: | Brazilian journal of physics |
| Database: | PERIÓDICA |
| System number: | 000390402 |
| ISSN: | 0103-9733 |
| Authors: | Shah, M.G1 Hossen, M.R1 Mamum, A.A1 |
| Institutions: | 1Jahangirnagar University, Department of Physics, Savar, Dhaka. Bangladesh |
| Year: | 2015 |
| Season: | Abr |
| Volumen: | 45 |
| Number: | 2 |
| Pages: | 219-224 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, analítico |
| English abstract | The problem of nonlinear positron-acoustic shock waves (PASWs) in an unmagnetized, collisionless, dense plasma system (containing non-relativistic cold positrons, both non-relativistic and ultra-relativistic degenerate electron and hot positron fluids and positively charged static ions) is addressed. The combined effects of the nonrelativistic and ultra-relativistic degenerate electron and hot positron fluids are organized in the study of the PASWs. By using the reductive perturbation method, modified Burgers equation is derived and numerically analyzed. For the nonrelativistic limits in like manner for the ultra-relativistic limits, it is seen that the shock wave characteristics are modified significantly. The effects of kinematic viscosity, degenerate pressure, nonplanar geometries, and plasma particle number densities on the properties of PASWs are numerically analyzed. As time goes, PASWs propagating in cylindrical and spherical geometry are deformed. The fundamental features and the underlying physics of PASWs, which are concerned to some astrophysical compact objects (viz. neutron stars, white dwarfs, etc.), are concisely mentioned |
| Disciplines: | Física y astronomía |
| Keyword: | Física de materia condensada, Ondas de choque, Ondas acústicas positrónicas, Geometría no planar, Presión degenerada, Efecto relativista, Objetos compactos |
| Keyword: | Physics and astronomy, Condensed matter physics, Shock waves, Positron-acoustic waves, Nonplanar geometry, Degenerate pressure, Relativistic effect, Compact objects |
| Full text: | Texto completo (Ver PDF) |
