52 citations · 114 across the 6 of their papers we have counts for
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Four-loop screened perturbation theory
Jens O. Andersen, Lars Kyllingstad
We study the thermodynamics of massless phi-fourth theory using screened perturbation theory. In this method, the perturbative expansion is reorganized by adding and subtracting a…
Linear sigma model at finite density in the 1/N expansion to next-to-leading order
Jens O. Andersen, Tomas Brauner
We study relativistic Bose-Einstein condensation at finite density and temperature using the linear sigma model in the one-particle-irreducible 1/N-expansion. We derive the effecti…
Relativistic Bose gases at finite density
Jens O. Andersen
We consider a massive relativistic Bose gas with complex scalars at finite density. At zero temperature, we calculate the pressure, charge density and the speed of sound in the…
Thermal Field Theory in Equilibrium
Jens O. Andersen
In this talk, I review recent developments in equilibrium thermal field theory. Screened perturbation theory and hard-thermal-loop perturbation theory are discussed. A self-consist…
On Effective Field Theories at Finite Temperature
J. O. Andersen
Chapter one is devoted to a study of fermions and bosons in two spatial dimensions in external electromagnetic fields. The effectve action is calculated by integrating out the matt…
The Free Energy in Scalar Electrodynamics at High Temperature
J. O. Andersen
Massless scalar electrodynamics is studied at high temperature and zero chemical potential. I derive the free energy to order , and by effective field theory meth…