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Theory of the weakly interacting Bose gas

- J. Andersen
- Physics
- 7 May 2003

This article reviews recent advances in the theory of the three-dimensional dilute homogeneous Bose gas at zero and finite temperature. Effective-field-theory methods are used to formulate a… Expand

Low dimensional Bose gases

- U. Khawaja, J. Andersen, N. Proukakis, H. Stoof
- Physics
- 6 February 2002

We present an improved many-body T-matrix theory for partially Bose-Einstein condensed atomic gases by treating the phase fluctuations exactly. The resulting mean-field theory is valid in arbitrary… Expand

Three-loop HTL QCD thermodynamics

- J. Andersen, Lars E. Leganger, M. Strickland, Nan Su
- Physics
- 13 March 2011

The hard-thermal-loop perturbation theory (HTLpt) framework is used to calculate the thermodynamic functions of a quark-gluon plasma to three-loop order. This is the highest order accessible by… Expand

Hard thermal loop resummation of the free energy of a hot gluon plasma

- J. Andersen, E. Braaten, M. Strickland
- Physics
- 11 February 1999

We calculate the free energy of a hot gluon plasma to leading order in hard-thermal-loop perturbation theory. Effects associated with screening, gluon quasiparticles, and Landau damping are resummed… Expand

The chiral transition in a magnetic background: finite density effects and the functional renormalization group

- J. Andersen, A. Tranberg
- Physics
- 16 April 2012

A bstractWe compute the phase diagram of the quark-meson model at finite temperature, finite baryon chemical potential μB = 3 μ and constant external magnetic field B, using the functional… Expand

HTL Perturbation Theory to Two Loops

- J. Andersen, E. Braaten, Emmanuel Petitgirard, M. Strickland
- Physics
- 9 May 2002

We calculate the pressure for pure-glue QCD at high temperature to two-loop order using hard-thermal-loop (HTL) perturbation theory. At this order, all the ultraviolet divergences can be absorbed… Expand

Four-loop screened perturbation theory

- J. Andersen, Lars T. Kyllingstad
- Physics
- 29 May 2008

We study the thermodynamics of massless {phi}{sup 4}-theory using screened perturbation theory. In this method, the perturbative expansion is reorganized by adding and subtracting a thermal mass term… Expand

Pressure to order g8log g of massless ϕ4 theory at weak coupling

- J. Andersen, Lars T. Kyllingstad, Lars E. Leganger
- Physics
- 26 March 2009

We calculate the pressure of massless 4-theory to order g8log (g) at weak coupling. The contributions to the pressure arise from the hard momentum scale of order T and the soft momentum scale of… Expand

Thermodynamics of the O(N) nonlinear sigma model in 1+1 dimensions

- J. Andersen, D. Boer, Harmen J. Warringa
- Physics
- 9 September 2003

The thermodynamics of the O(N) nonlinear sigma model in 1+1 dimensions is studied. We calculate the pressure to next-to-leading order in the 1/N expansion and show that at this order, only the… Expand

Phase fluctuations in atomic Bose gases.

- J. Andersen, U. Al Khawaja, H. Stoof
- Physics, Medicine
- Physical review letters
- 7 September 2001

We improve on the Popov theory for partially Bose-Einstein condensed atomic gases by treating the phase fluctuations exactly. As a result, the theory becomes valid in arbitrary dimensions and is able… Expand

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