Photon and dilepton production in supersymmetric Yang-Mills plasma

By S. Caron-Huot, P. Kovtun, Guy D. Moore, A. Starinets, Laurence G. Yaffe. 2006

235 citations recorded by the source corpus.

By weakly gauging one of the U(1) subgroups of the R-symmetry group, = 4 super-Yang-Mills theory can be coupled to electromagnetism, thus allowing a computation of photon production and related phenomena in a QCD-like non-Abelian plasma at both weak and strong coupling. We compute photon and dilepton emission rates from finite temperature = 4 supersymmetric Yang-Mills plasma both perturbatively at weak coupling to leading order, and non-perturbatively at strong coupling using the AdS/CFT duality conjecture. Comparison of the photo-emission spectra for = 4 plasma at weak coupling, = 4 plasma at strong coupling, and QCD at weak coupling reveals several systematic trends which we discuss. We also evaluate the electric conductivity of = 4 plasma in the strong coupling limit, and to leading-log order at weak coupling. Current-current spectral functions in the strongly coupled theory exhibit hydrodynamic peaks at small frequency, but otherwise show no structure which could be interpreted as well-defined thermal resonances in the high-temperature phase.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/1b854930b33afda172beaa46fbb0184607b50c62

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Citations in the corpus

Gauge/String Duality, Hot QCD and Heavy Ion Collisions (2011, background): “The NfNc scaling of the spectral function reflects the number of electrically charged degrees of freedom in the plasma; in the case of two R-symmetry currents, NfNc would be replaced by N 2 c [623].”
Light quark energy loss in strongly coupled N=4 supersymmetric Yang-Mills plasma (2008, background): “When both theories are weakly coupled, appropriate comparisons of a variety of observables show rather good agreement [9, 10, 11].”
Improved Holographic QCD (2010, background): “Most of the transport properties mentioned above have been successfully computed in N = 4 SYM and a lot of debate is still waged as to how they can be applied to QCD in the appropriate temperature range, [11],[50],[51].”
Holographic Hydrodynamics with a Chemical Potential (2009, background): “alized potential A˜ µ. Further, in order to interpret the result as the ‘electrical’ conductivity of the plasma, we imagine coupling the CFT current to an external or auxiliary vector ﬁeld, following [20, 39]. This auxiliary vector gauges the corresponding global U(1) symmetry in the CFT with a (sma”
Thermodynamics and instabilities of a strongly coupled anisotropic plasma (2011, background): “ been calculated both in the absence [182,183,184] (see [185] for a review) and in the presence of anisotropy [186,187,188,189]. Corresponding studies at strong coupling in the isotropic case include [190,191,192,193], and we are currently extending these calculations to the anisotropic case. Acknow”
Holographic spectral functions and diffusion constants for fundamental matter (2007, methodology): “3 A simple example: spectral function of R currents in N = 4 SYM Correlators of R-currents in strongly coupled N = 4 SU(Nc) supersymetric Yang-Mills (SYM) theory at large Nc were previously studied by means of the AdS/CFT correspondence both at zero [31, 32] and finite temperature [16, 33, 29, 30, 1”
Quantum critical transport, duality, and M-theory (2007, methodology): “In strongly coupled N=4 SYM in D=3+1, hydrodynamic to collisionless crossover functions K (ω, k) were computed in [55].”
Comparing the drag force on heavy quarks in N = 4 super-Yang-Mills theory and QCD (2006, background): “But it was not claimed in [6] that one can carry one of these last two relations directly to the strong coupling regime, nor indeed was it made clear how to implement the underlying ideas (matching of mD or m∞) in the strongly coupled regime.”
Thermalization with a chemical potential from AdS spaces (2012, background): “which was ﬁrstly computed in [10] within the supergravity limit, while its string theory corrections were obtained in [11, 12]. The ﬁrst computation of photoemission rates in this context was done in [13] and their corresponding leading order string theory corrections were obtained in [14]. The way ”
Holographic operator mixing and quasinormal modes on the brane (2009, background): “where i, j = T, L and the transverse and the longitudinal projectors are defined in the standard way (see [15] for example) For k = (ω, q, 0, 0) this leads to the only non-vanishing components”
Thermal transport and drag force in improved holographic QCD (2009, background): “Most of the transport properties mentioned above have been successfully computed in N = 4 SYM and a lot of debate is still waged as to how they can be applied to QCD in the appropriate temperature range, [33–35].”
Generalized holographic quantum criticality at finite density (2011, unknown): “d, and one may check that it indeed coincides in ve dimensions, p+ q= 4, with the linear scaling of the DC conductivity with temperature obtained in various works using either correlator calculations [50], probe branes [40] or hydrodynamic gradient expansions [51, 52]. The third one, in the boosted ”