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Ground State of a trapped Bose-Einstein Condensate in Two Dimensions; Beyond the Mean-field Approximation
Jens O. Andersen, Haarek Haugerud
We consider the ground state of a trapped Bose-Einstein condensate in two dimensions. In the mean-field approximation, the ground state density profile satisfies the Gross-Pitaevsk…
Three Loop Free Energy Using Screened Perturbation Theory
Jens O. Andersen
The conventional weak-coupling expansion for the pressure of a hot plasma shows no sign of convergence unless the the coupling constant is tiny. In this talk, I discuss screene…
Screened Perturbation Theory to Three Loops
Jens O. Andersen, Eric Braaten, Michael Strickland
The thermal physics of a massless scalar field with a phi^4 interaction is studied within screened perturbation theory (SPT). In this method the perturbative expansion is reorganiz…
The Massive Thermal Basketball Diagram
Jens O. Andersen, Eric Braaten, Michael Strickland
The "basketball diagram" is a three-loop vacuum diagram for a scalar field theory that cannot be expressed in terms of one-loop diagrams. We calculate this diagram for a massive sc…
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…