Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-09-19
Phys. Rev. D 84, 125027 (2011)
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 5 figures; v2: published version, title changed in accordance with PRD editor's suggestion, minor clarifications and
Scientific paper
10.1103/PhysRevD.84.125027
The electric permittivity and magnetic permeability for the quark-gluon plasma (QGP) is calculated within the hard-thermal-loop (HTL) perturbation theory. The refractive indices in the magnetizable and non-magnetizable plasmas are calculated. In a magnetizable plasma, there is a frequency pole $\omega_{mp}$ in the magnetic permeability and the refractive index. The refractive index becomes negative in the range $\omega\in[k,\omega_{mp}]$, where $k$ is the wave number, but no propagating modes are found. In a non-magnetizable plasma, the magnetic permeability and the refractive index are always positive. This marks the main distinction of a weakly coupled plasma from a strongly coupled one, where the negative refraction is shown to exist in a holographic theory.
Liu Juan
Luo M. J.
Wang Qiangguo
Xu Hao-jie
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