Date: Thu, 29 May 08 00:00:25 GMT Subject: hep-lat daily 2 new + 2 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any complaints regarding submissions directly to submitter. ------------------------------------------------------------------------------ Point your www client at http://arXiv.org/ To unsubscribe, e-mail To: hep-lat@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Mon 26 May 08 20:00:02 GMT to Wed 28 May 08 20:00:01 GMT ------------------------------------------------------------------------------ \\ arXiv:0805.4235 Date: Wed, 28 May 2008 19:01:23 GMT (201kb) Title: Exact Lattice Supersymmetry at Large N Authors: Kazuhiro Nagata Categories: hep-lat Comments: 41 pages, 18 figures \\ Employing a novel type of non-commutative product in the Dirac-Kahler twisted superspace on a lattice, we formulate a field theoretically rigid framework of extended supersymmetry on a lattice. As a first example of this treatment, we calculate one-loop (in some cases any loops) quantum corrections for a twisted Wess-Zumino model with N \times N hermitian matrix superfields on a two dimensional lattice. The calculations are entirely given in a lattice superfield framework. We report that the mass and the coupling constant are exactly protected from the radiative corrections at non-zero lattice spacing as far as the planar diagrams are concerned, which implies the realization of exact lattice supersymmetry w.r.t. all the supercharges in the large-N limit. \\ ( http://arxiv.org/abs/0805.4235 , 201kb) ------------------------------------------------------------------------------ \\ arXiv:0805.4246 Date: Wed, 28 May 2008 01:46:04 GMT (761kb) Title: Buried treasure in the sand of the QCD vacuum Authors: P. J. Moran, D. B. Leinweber Categories: hep-lat Comments: 6 pages, 6 figures, presented at QCD Downunder II Report-no: ADP-08-03/T663 \\ The short-range structure of the 2+1 flavour QCD vacuum is studied through visualisations of the topological charge density. Of particular interest is a new Gaussian weighted smearing algorithm which is applied to the rough topological charge density to disclose underlying long range structure. The results provide support for the view of the QCD vacuum as a sandwich of sign-alternating sheets of charge, with a long-range structure hidden beneath. \\ ( http://arxiv.org/abs/0805.4246 , 761kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:0805.1303 (*cross-listing*) Date: Fri, 9 May 2008 08:28:24 GMT (262kb) Title: Chiral Condensate at Nonzero Chemical Potential in the Microscopic Limit of QCD Authors: J.C. Osborn, K. Splittorff, J.J.M. Verbaarschot Categories: hep-th hep-lat math-ph math.MP Comments: 29 pages, 5 figures \\ The chiral condensate in QCD at zero temperature does not depend on the quark chemical potential (up to one third the nucleon mass), whereas the spectral density of the Dirac operator shows a strong dependence on the chemical potential. The cancellations which makes this possible also occur on the microscopic scale, where they can be investigated by means of a random matrix model. We show that they can be understood in terms of orthogonality properties of orthogonal polynomials. In the strong nonhermiticity limit they are related to integrability properties of the spectral density. As a by-product we find exact analytical expressions for the partially quenched chiral condensate in the microscopic domain at nonzero chemical potential. \\ ( http://arxiv.org/abs/0805.1303 , 262kb) ------------------------------------------------------------------------------ \\ arXiv:0805.3804 (*cross-listing*) Date: Mon, 26 May 2008 16:31:26 GMT (325kb) Title: Nonperturbative contributions to the QCD pressure Authors: Klaus Lichtenegger, Daniel Zwanziger Categories: hep-ph hep-lat hep-th Comments: 14 pages, 13 figures, uses xcolor.sty \\ We summarize the most important arguments why a perturbative description of finite-temperature QCD is unlikely to be possible and review various well-established approaches to deal with this problem. Then, using a recently proposed method, we investigate nonperturbative contributions to the QCD pressure and other observables (like energy, anomaly and bulk viscosity) obtained by imposing a functional cutoff at the Gribov horizon. Finally, we discuss how such contributions fit into the picture of consecutive effective theories, as proposed by Braaten and Nieto, and give an outline of the next steps necessary to improve this type of calculation. \\ ( http://arxiv.org/abs/0805.3804 , 325kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:hep-th/0606195 (*cross-listing*) replaced with revised version Tue, 27 May 2008 15:03:15 GMT (151kb) Title: Holographic melting and related properties of mesons in a quark gluon plasma Authors: Kasper Peeters, Jacob Sonnenschein and Marija Zamaklar Categories: hep-th hep-lat hep-ph Comments: 25 pages, 23 figures; v2: emphasised dependence of interquark distance on velocity, added plot, added references; v3: error in section V corrected, conclusions unchanged Report-no: AEI-2006-042, TAUP-2826/06 Journal-ref: Phys.Rev. D74 (2006) 106008 \\ ( http://arxiv.org/abs/hep-th/0606195 , 151kb) ------------------------------------------------------------------------------ \\ arXiv:0803.4339 replaced with revised version Wed, 28 May 2008 15:43:41 GMT (44kb) Title: Twisted SUSY Invariant Formulation of Chern-Simons Gauge Theory on a Lattice Authors: Kazuhiro Nagata, Yong-Shi Wu Categories: hep-lat cond-mat.mes-hall cond-mat.str-el hep-th Comments: 22 pages, 4 figures; added references \\ ( http://arxiv.org/abs/0803.4339 , 44kb) ------------------------------------------------------------------------------ \\ arXiv:0804.4308 replaced with revised version Wed, 28 May 2008 05:49:17 GMT (28kb) Title: On the Volume Dependence of Spectral Weights for Unstable Particles in Lattice QCD Authors: Chuan Liu Categories: hep-lat Comments: 14 pages, no figures. Modified to focus on the discussion of spectral weights \\ ( http://arxiv.org/abs/0804.4308 , 28kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- For subscribe options to combined physics archives, e-mail To: physics@arXiv.org, Subject: subscribe ----------------------------------------------------------------------------- For help on viewing and making submissions, see http://arXiv.org/help/ For a list of archive mirror sites, see http://arXiv.org/servers.html ----------------------------------------------------------------------------- Third-party submissions cause excessive problems. Author self-submissions are exceedingly preferred. E-mail submissions have been discontinued in favor of better support for Web submissions. See http://arXiv.org/help/uploads