標題: Holographic photon production with magnetic field in anisotropic plasmas
作者: Wu, Shang-Yu
Yang, Di-Lun
物理研究所
Institute of Physics
關鍵字: Quark-Gluon Plasma;Holography and quark-gluon plasmas
公開日期: 1-八月-2013
摘要: We investigate the thermal photon production from constant magnetic field in a strongly coupled and anisotropic plasma via the gauge/gravity duality. The dual geometry with pressure anisotropy is generated from the axion-dilaton gravity action introduced by Mateos and Trancancelli and the magnetic field is coupled to fundamental matters(quarks) through the D3/D7 embeddings. We find that the photon spectra with different quark mass are enhanced at large frequency when the photons are emitted parallel to the anisotropic direction with larger pressure or perpendicular to the magnetic field. However, in the opposite conditions for the emitted directions, the spectra approximately saturate isotropic results in the absence of magnetic field. On the other hand, a resonance emerges at moderate frequency for the photon spectrum with heavy quarks when the photons move perpendicular to the magnetic field. The resonance is more robust when the photons are polarized along the magnetic field. On the contrary, in the presence of pressure anisotropy, the resonance will be suppressed. There exist competing effects of magnetic field and pressure anisotropy on meson melting in the strongly coupled super Yang-Mills plasma, while we argue that the suppression led by anisotropy may not be applied to the quark gluon plasma.
URI: http://dx.doi.org/10.1007/JHEP08(2013)032
http://hdl.handle.net/11536/22800
ISSN: 1029-8479
DOI: 10.1007/JHEP08(2013)032
期刊: JOURNAL OF HIGH ENERGY PHYSICS
Volume: 
Issue: 8
結束頁: 
顯示於類別:期刊論文


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  1. 000324113700032.pdf