Hasil untuk "hep-ph"

Akash Roy, Mithun Sharma, Anand V. Kulkarni et al.

George W. Marek, Harmeet Malhi

Brian Weiner, Chris Forsmark, Vikas Khular et al.

Xiaohan Ying, Lasha Gogokhia, Arun B. Jesudian et al.

Meghan R. Mansour, Thomas D. Meram, Steven A. Kessler et al.

D.H. Sinn, D. Kang, E. Guallar et al.

Daniel D. Penrice, Puru Rattan, Douglas A. Simonetto

G.N. Duronio, X. Liang, P. Hebbar et al.

S. Palchaudhuri, A. Parsikia, J.D. Lewis et al.

Jost Künzli von Fimelsberg

B. Casu*, G. Torri, M. Legramandi et al.

N. Minamoto, K. Kurata, I. Kaizuka et al.

Kovalenko Al, Kazakov Vi, Slita Av et al.

D. Jonathan Sebastian, Herbert Waldmann

B. Gripaios, J. G. Milhano

A variational analysis of the pure SU(N) gauge theory in 3 + 1 dimensions at finite temperature is performed, extending the work of Kogan et al. [JHEP 0212 (2002) 017, hep-ph/0208053]. A de-confining phase transition is found at a temperature of 470 MeV, somewhat higher than lattice estimates [hep-th/9812187]. This value is however rather sensitive, for reasons which are discussed. A more robust quantity is the ratio of the transition temperature to the lightest glueball mass in the model. This is 0.18, in agreement with the lattice estimate for SU(3) to two significant figures. Ways of further improving the calculation are discussed.  2003 Published by Elsevier Science B.V. PACS: 12.38.Aw; 12.38.Lg

P. Jizba

With non-equilibrium applications in mind we present in this paper a self-contained calculation of the hydrostatic pressure of the O(N)\lambda \phi^4 theory at finite temperature. By combining the Keldysh-Schwinger closed-time path formalism with thermal Dyson-Schwinger equations we compute in the large N limit the hydrostatic pressure in a fully resumed form. We also calculate the high-temperature expansion for the pressure (in D=4) using the Mellin transform technique. The result obtained extends the results found by Drummond et al. [hep-ph/9708426] and Amelino-Camelia and Pi [hep-ph/9211211]. The latter are reproduced in the limits m_r(0)\to 0, T \to \infty and T \to \infty, respectively. Important issues of renormalizibility of composite operators at finite temperature are addressed and the improved energy-momentum tensor is constructed. The utility of the hydrostatic pressure in the non-equilibrium quantum systems is discussed.

S. Hannestad, J. Madsen

M. Bruns, B. Dietzschold, L. Schneider et al.