منابع مشابه
QED second order corrections on the speed of light at low temperature
We want to study thermal corrections on the speed of light at low temperature considering temperature dependence of photon vacuum polarization tensor at two-loop level in the standard QED. It is found that the heat bath behaves as a dispersive medium for the propagation of light and reduces its speed proportional to the second order of temperature. Similarities and differences, in light ...
متن کاملThe Free Energy of High Temperature QED to Order e From Effective Field Theory
Massless quantum electrodynamics is studied at high temperature and zero chemical potential. We compute the Debye screening mass to order e and the free energy to order e by an effective field theory approach, recently developed by Braaten and Nieto. Our results are in agreement with calculations done in resummed perturbation theory. This method makes it possible to separate contributions to th...
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پس ازفروپاشی شوروی،رشد منابع نفت و گاز، آسیای میانه و قفقاز را در یک بازی ژئوپلتیکی انرژی قرار داده است. با در نظر گرفتن این منابع هیدروکربنی، این منطقه به یک میدانجنگ و رقابت تجاری برای بازی های ژئوپلتیکی قدرت های بزرگ جهانی تبدیل شده است. روسیه منطقه را به عنوان حیات خلوت خود تلقی نموده و علاقمند به حفظ حضورش می باشد تا همانند گذشته گاز طبیعی را به وسیله خط لوله مرکزی دریافت و به عنوان یک واس...
15 صفحه اولDensity dependence of the symmetry free energy of hot nuclei
S. K. Samaddar,1 J. N. De,1 X. Viñas,2 and M. Centelles2 1Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India 2Departament d’Estructura i Constituents de la Matèria and Institut de Ciències del Cosmos, Facultat de Fı́sica, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain (Received 15 April 2008; revised manuscript received 11 August 2008; published 19 Septemb...
متن کاملdetermination of maximal singularity free zones in the workspace of parallel manipulator
due to the limiting workspace of parallel manipulator and regarding to finding the trajectory planning of singularity free at workspace is difficult, so finding a best solution that can develop a technique to determine the singularity-free zones in the workspace of parallel manipulators is highly important. in this thesis a simple and new technique are presented to determine the maximal singula...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1994
ISSN: 0370-2693
DOI: 10.1016/0370-2693(94)90708-0