Zobrazeno 1 - 10
of 65
pro vyhledávání: '"Andersen, J. O."'
Publikováno v:
In European Journal of Pharmaceutical Sciences 1 September 2019 137
Publikováno v:
Phys.Rev.A68:043603,2003
We investigate the long-range phase coherence of homogeneous and trapped Bose gases as a function of the geometry of the trap, the temperature, and the mean-field interactions in the weakly interacting limit. We explicitly take into account the (quas
Externí odkaz:
http://arxiv.org/abs/cond-mat/0303483
We discuss some subtleties regarding the depletion of the condensate in homogeneous two and three-dimensional Bose at zero temperature. We find agreement with the results of Popov theory. Other results in the paper cond-mat/0202085 are not affected b
Externí odkaz:
http://arxiv.org/abs/cond-mat/0209120
Publikováno v:
Phys.Rev.A66:013615,2002
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 dimensions and able to describe the low-temperature
Externí odkaz:
http://arxiv.org/abs/cond-mat/0202085
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 to describe the low-temperature crossover between
Externí odkaz:
http://arxiv.org/abs/cond-mat/0109143
Autor:
Antonuccio, F., Andersen, J. O.
We perform a two-loop calculation in light-front phi^4 theory to determine the effective mass renormalization of the light-front Hamiltonian. The renormalization scheme adopted here is manifestly boost invariant, and yields results that are in perfec
Externí odkaz:
http://arxiv.org/abs/hep-th/9904140
Autor:
Andersen, J. O.
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 matter fields. In chapter two, I investigate the resummation program of Br
Externí odkaz:
http://arxiv.org/abs/hep-ph/9709331
Autor:
Andersen, J. O.
Massless scalar electrodynamics is studied at high temperature and zero chemical potential. I derive the free energy to order $\lambda^2$, $\lambda e^2$ and $e^4$ by effective field theory methods. The first step consists of the construction of an ef
Externí odkaz:
http://arxiv.org/abs/hep-ph/9709294
Autor:
Andersen, J. O.
Publikováno v:
Phys.Rev. D57 (1998) 5004-5009
We study massless $g^2\Phi^4$-theory at high temperature and with zero chemical potential. Using modern effective field theory methods,% recently developed by Braaten and Nieto, we derive the screening mass squared to order $g^5$. It is demonstrated
Externí odkaz:
http://arxiv.org/abs/hep-ph/9708276
We study the thermodynamic behaviour of an ideal gas of bosons trapped in a three-dimensional anisotropic harmonic oscillator potential. The condensate fraction as well as the specific heat is calculated using the Euler-Maclaurin approximation. For a
Externí odkaz:
http://arxiv.org/abs/cond-mat/9611061