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The Colored Glass Condensate and Extreme QCD  [PDF]
Edmond Iancu
Physics , 2000,
Abstract: The high energy limit of QCD is controlled by the small-$x$ part of a hadron wavefunction. I argue that this part is universal to all hadrons and is composed of a new form of matter: a Colored Glass Condensate. This matter is weakly interacting at very small $x$, but is non-perturbative because of the highly occupied boson states which compose the condensate. Such a matter might be studied in high energy lepton-hadron or hadron-hadron interactions.
Deep Inelastic Scattering in the Color Glass Formalism  [PDF]
Kazunori Itakura
Physics , 2003,
Abstract: I discuss dome phenomenological consequences of the Color Glass formalism for deep inelastic scattering.
Probing colored glass via $q\bar{q}$ photoproduction  [PDF]
F. Gelis,A. Peshier
Physics , 2001, DOI: 10.1016/S0375-9474(01)01264-7
Abstract: In this paper, we calculate the cross-section for the photoproduction of quark-antiquark pairs in the peripheral collision of ultra-relativistic nuclei, by treating the color field of the nuclei within the Color Glass Condensate model. We find that this cross-section is sensitive to the saturation scale $Q_s^2$ that characterizes the model. In particular, the transverse momentum spectrum of the produced pairs could be used to measure the properties of the color glass condensate.
Isotropization from Color Field Condensate in heavy ion collisions  [PDF]
Stefan Floerchinger,Christof Wetterich
Physics , 2013, DOI: 10.1007/JHEP03(2014)121
Abstract: The expanding fireball shortly after a heavy ion collision may be qualitatively described by a condensate of color fields or gluons which is analogous to Bose-Einstein-condensation for massive bosonic particles. This condensate is a transient non-equilibrium phenomenon and breaks Lorentz-boost symmetry. The dynamics of color field condensates involves collective excitations and is rather different from the perturbative scattering of gluons. In particular, it provides for an efficient mechanism to render the local pressure approximately isotropic after a short time of 0.2 fm/c. We suggest that an isotropic color field condensate may play a central role for a simple description of prethermalization and isotropization in the early stages of the collision.
Longitudinal Viscous Hydrodynamic Evolution for the Shattered Colour Glass Condensate  [PDF]
Akihiko Monnai,Tetsufumi Hirano
Physics , 2011, DOI: 10.1016/j.physletb.2011.08.049
Abstract: We investigate hydrodynamic evolution of the quark gluon plasma for the colour glass condensate type initial conditions. We solve full second-order viscous hydrodynamic equations in the longitudinal direction to find that non-boost invariant expansion leads to visible deformation on the initial rapidity distribution. The results indicate that hydrodynamic evolution with viscosity plays an important role in determining parameters for the initial distributions.
Electromagnetic currents induced by color fields  [PDF]
Naoto Tanji
Physics , 2015,
Abstract: The quark production in classical color fields is investigated with a focus on the induction of an electromagnetic current by produced quarks. We show that the color SU(2) and the SU(3) theories lead significantly different results for the electromagnetic current. In uniform SU(2) color fields, the net electromagnetic current is not generated, while in SU(3) color fields the net current is induced depending on the color direction of background fields. Also the numerical study of the quark production in inhomogeneous color fields is done. Motivated by gauge field configurations provided by the color glass condensate framework, we introduce an ensemble of randomly distributed color electric fluxtubes. The spectrum of photons emitted from the quarks by a classical process is shown.
Probing colored glass via $q\bar{q}$ photoproduction II: diffraction  [PDF]
F. Gelis,A. Peshier
Physics , 2001, DOI: 10.1016/S0375-9474(02)00752-2
Abstract: In this paper, we consider the diffractive photoproduction of quark-antiquark pairs in peripheral heavy ion collisions. The color field of the nuclei is treated within the Colored Glass Condensate model. The cross-section turns out to be very sensitive to the value of the saturation scale.
How Protons Shatter Colored Glass  [PDF]
Adrian Dumitru,Larry McLerran
Physics , 2001, DOI: 10.1016/S0375-9474(01)01301-X
Abstract: We consider the implications of the Color Glass Condensate for the central region of p+A collisions. We compute the k_t distribution of radiated gluons and their rapidity distribution dN/dy analytically, both in the perturbative regime and in the region between the two saturation momenta. We find an analytic expression for the number of produced gluons which is valid when the saturation momentum of the proton is much less than that of the nucleus. We discuss the scaling of the produced multiplicity with A. We show that the slope of the rapidity density dN/dy provides an experimental measure for the renormalization-group evolution of the color charge density of the Color Glass Condensate (CGC). We also argue that these results are easily generalized to collisions of nuclei of different A at central rapidity, or with the same A but at a rapidity far from the central region.
Simulation of Color Blindness and a Proposal for Using Google Glass as Color-correcting Tool  [PDF]
H. M. de Oliveira,J. Ranhel,R. B. A. Alves
Computer Science , 2015,
Abstract: The human visual color response is driven by specialized cells called cones, which exist in three types, viz. R, G, and B. Software is developed to simulate how color images are displayed for different types of color blindness. Specified the default color deficiency associated with a user, it generates a preview of the rainbow (in the visible range, from red to violet) and shows up, side by side with a colorful image provided as input, the display correspondent colorblind. The idea is to provide an image processing after image acquisition to enable a better perception ofcolors by the color blind. Examples of pseudo-correction are shown for the case of Protanopia (red blindness). The system is adapted into a screen of an i-pad or a cellphone in which the colorblind observe the camera, the image processed with color detail previously imperceptible by his naked eye. As prospecting, wearable computer glasses could be manufactured to provide a corrected image playback. The approach can also provide augmented reality for human vision by adding the UV or IR responses as a new feature of Google Glass.
Possible Color Octet Quark-Anti-Quark Condensate in the Instanton Model  [PDF]
Thomas Schaefer
Physics , 2001, DOI: 10.1103/PhysRevD.64.037501
Abstract: Inspired by a recent proposal for a Higgs description of QCD we study the possible formation of a color-octet/flavor-octet quark-anti-quark condensate in the instanton liquid model. For this purpose we calculate two-point correlation functions of color-singlet and octet quark-anti-quark operators. We find long range order in the standard $<\bar{\psi}\psi>$ channel, but not in the color-octet channel. We emphasize that similar calculations in lattice QCD can check whether or not a color-flavor locked Higgs phase is realized in QCD at zero temperature and baryon density.
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