Particle theory

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Revisiting parton evolution and the large-x limit

(2005)

Authors:

Yu L Dokshitzer, G Marchesini, GP Salam
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Transport coefficients of strongly coupled gauge theories: insights from string theory

(2005)
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Parton Distributions: Summary Report

(2005)

Authors:

M Dittmar, S Forte, A Glazov, S Moch, S Alekhin, G Altarelli, J Andersen, RD Ball, J Blumlein, H Bottcher, T Carli, M Ciafaloni, D Colferai, A Cooper-Sarkar, G Corcella, L Del Debbio, G Dissertori, J Feltesse, A Guffanti, C Gwenlan, J Huston, G Ingelman, M Klein, JI Latorre, T Lastovicka, G Lastovicka-Medin, L Magnea, A Piccione, J Pumplin, V Ravindran, B Reisert, J Rojo, A Sabio Vera, GP Salam, F Siegert, A Stasto, H Stenzel, C Targett-Adams, RS Thorne, A Tricoli, JAM Vermaseren, A Vogt
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The pressure of the SU(N) lattice gauge theory at large N

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 628:1-2 (2005) 113-124

Authors:

B Bringoltz, M Teper

Abstract:

We calculate bulk thermodynamic properties, such as the pressure, energy density, and entropy, in SU(4) and SU(8) lattice gauge theories, for the range of temperatures T≤2.0Tc and T≤1.6Tc, respectively. We find that the N=4,8 results are very close to each other, and to what one finds in SU(3), and are far from the asymptotic free-gas value. We conclude that any explanation of the high-T pressure (or entropy) deficit must be such as to survive the N→∞ limit. We give some examples of this constraint in action and comment on what this implies for the relevance of gravity duals. © 2005 Elsevier B.V. All rights reserved.
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Measuring the cosmological density perturbation

NUCL PHYS B-PROC SUP 148 (2005) 1-6

Abstract:

Precision measurements of anisotropies in the cosmic microwave background and of the clustering of largescale structure have supposedly confirmed that the primordial density perturbation has a (nearly) scale-invariant spectrum. However this conclusion is based on assumptions about the world model and the nature of the dark matter. Physical models of inflation suggest that the spectrum may not in fact be scale-free, which would imply rather different cosmological parameters on the basis of the same observational data.
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