Thermal photon production in a strongly coupled anisotropic plasma

被引:37
作者
Patino, Leonardo [1 ]
Trancanelli, Diego [2 ,3 ]
机构
[1] Univ Nacl Autonoma Mexico, Dept Fis, Fac Ciencias, Mexico City 04510, DF, Mexico
[2] Univ Sao Paulo, Inst Fis, BR-05314970 Sao Paulo, Brazil
[3] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
关键词
Gauge-gravity correspondence; Holography and quark-gluon plasmas; QUARK-GLUON PLASMA;
D O I
10.1007/JHEP02(2013)154
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
Photons produced in heavy ion collisions escape from the surrounding medium virtually unperturbed by it, thus representing an excellent probe of the conditions at the emission point. Using the gauge/gravity duality, we calculate the rate of photon production in an anisotropic, strongly coupled N = 4 plasma with N-f << N-c quark flavors. We consider arbitrary orientations of the photon momentum with respect to the anisotropic direction, as well as arbitrary values of the anisotropy. We present results for the correlation functions of two electromagnetic currents and for the electric conductivity. These quantities can be larger or smaller than the isotropic ones, depending on the direction of propagation and polarization of the photons. The total production rate is however always larger than the isotropic one, independently of the frequency, direction of propagation, and value of the anisotropy.
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页数:27
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