排序方式: 共有5条查询结果,搜索用时 31 毫秒
1
1.
We re-formulate the 3+1 GRMHD equations for the Schwarzschild black hole in a Veselago medium. Linear perturbation in rotating
(non-magnetized and magnetized) plasma is introduced and their Fourier analysis is considered. We discuss wave properties
with the help of wave vector, refractive index and change in refractive index in the form of graphs. It is concluded that
some waves move away from the event horizon in this unusual medium. We conclude that for the rotating non-magnetized plasma,
our results confirm the presence of Veselago medium while the rotating magnetized plasma does not provide any evidence for
this medium. 相似文献
2.
3.
This paper investigates wave properties of hot plasma in a Veselago medium. For the Schwarzschild black hole, the 3+1 GRMHD
equations are re-formulated which are linearly perturbed and then Fourier analyzed for rotating (non-magnetized and magnetized)
plasmas. The graphs of wave vector, refractive index and change in refractive are used to discuss the wave properties. The
results obtained confirm the presence of Veselago medium for both rotating (non-magnetized and magnetized) plasmas. This work
generalized the isothermal plasma waves in the Veselago medium to hot plasma case. 相似文献
4.
In this paper, we study wave properties of isothermal plasma for the Schwarzschild de-Sitter black hole in a Veselago medium.
We use ADM 3+1 formalism to formulate general relativistic magnetohydrodynamical (GRMHD) equations for the Schwarzschild de-Sitter
spacetime in Rindler coordinates. Further, Fourier analysis of the linearly perturbed GRMHD equations for the rotating (non-magnetized
and magnetized) background is taken whose determinant leads to a dispersion relation. We investigate wave properties by using
graphical representation of the wave vector, the refractive index, change in refractive index, phase and group velocities.
Also, the modes of wave dispersion are explored. The results indicate the existence of the Veselago medium. 相似文献
5.
This study records length-weight relationships(LWRs)for eleven commercially important marine catfi sh species of the family Ariidae(sea catfi shes)and Plotosidae(eel catfi shes)from the northern Arabian Sea coast of Pakistan.The specimens were sampled from December 2014 to November 2015,using bottom trawls with various mesh sizes by commercial vessels.The species were Nemapteryx caelatus,Sciades sona,Arius gagora,Batrachocephalus mino,Netuma thalassina,N.bilineata,Osteogeneiosus militaris,Plicofollis dussumieri,P.tenuispinis,Plotosus limbatus,and P.lineatus.Of the eleven species,two species A.gagora and N.bilineata were recorded for the fi rst time and LWRs for four species A.gagora,N.bilineata,S.sona,and B.mino still have no data in the Fish Base database.In addition,new maximum length for each of the three species N.bilineata,O.militaris and B.m ino was also found. 相似文献
1