http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Teleparallel Energy-momentum Distribution of Locally Rotationally Symmetric Spacetimes
M. Jamil Amir,Tahir Nazir 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.9
In this paper, we explore the energy-momentum distribution of locally rotationally symmetric(LRS) spacetimes in the context of the teleparallel theory of gravity by considering the three metrics,I, II and III, representing the whole class of LRS sapcetimes. In this regard, we use the teleparallelversions of the Einstein, Landau-Lifshitz, Bergmann-Thomson, and M¨oller prescriptions. Theresults show that the momentum density components for the Einstein, Bergmann-Thomson, andM¨oller prescriptions turn out to be same in all cases of the metrics I, II and III, but are differentfrom those of the Landau- Lifshitz prescription, while the energy components remain the same forthese three prescriptions only in all possible cases of the metrics I and II. We mention here thatthe M¨oller energy-momentum distribution is independent of the coupling constant ; that is, theseresults are valid for any teleparallel models.
Jeans-Alfvén instability in quantum dusty magnetoplasmas
Jamil, M.,Rasheed, A.,Amir, M.,Abbas, G.,Jung, Young-Dae Cambridge University Press 2017 Journal of plasma physics Vol.83 No.-
<P>The Jeans instability is examined in quantum dusty magnetoplasmas due to low-frequency magnetosonic perturbations. The fluid model consisting of the momentum balance equation for quantum plasmas, Poisson’s equation for the gravitational potential and Maxwell’s equations for electromagnetic magnetosonic perturbations is solved. The numerical analysis elaborates the significant contribution of magnetic field, electron number density and variable dust mass to the Jeans instability.</P>