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题名: Photoproduction and conductivity in dense holographic QCD
作者: Bu, YY
刊名: PHYSICAL REVIEW D
出版日期: 2012
卷号: 86, 期号:2, 页码:26003
关键词: QUARK-GLUON PLASMA ;  ADS/CFT
学科分类: Physics
通讯作者: Bu, YY (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
部门归属: [Bu, Yan Yan] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China; [Bu, Yan Yan] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany
英文摘要: We explore the photoemission rate and conductivity in dense QCD by taking the AdS/CFT methods. Specifically, we take three QCD gravity dual models to do comparative studies: D4/D6 model, noncritical Sakai-Sugimoto model and soft-wall AdS/QCD model. We turn on the time component of flavor U(1) gauge field in the bulk side to model the baryon density in QCD. For all three models, we numerically solve the U(1) fluctuation equation to plot the spectral function and photoemission rate for lightlike momenta as well as the AC conductivity. We find that the results for the former two models are very similar to previous studies while the last one show some differences. The conductivity in the soft-wall model seems to be similar to that of holographic superconductor constructed from five-dimensional bulk gravity, i.e. the pseudogap structure. This should be owing to that the infrared (IR) soft-wall (an effective cutoff near the IR of the geometry) produces a mass gap in the dual field theory, which has imprinting in the conductivity as a pseudogap formation. However, the DC conductivity in our computations is finite while it should be a delta peak in holographic superconductor models. Our results show the importance of dilaton running in affecting physical quantities.
资助者: MPS-CAS
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000305894600002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15061
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Bu, YY. Photoproduction and conductivity in dense holographic QCD[J]. PHYSICAL REVIEW D,2012,86(2):26003.
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