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51 papers · 1 filter
Coherence properties of the stochastic oscillator
Martti Havukainen, Stig Stenholm
An oscillator with stochastic frequency is discussed as a model for evaluating the quantum coherence properties of a physical system. It is found that the choice of jump statistics…
Decay in Two Higgs Doublet Models
Katri Huitu, Cai-Dian Lü, Paul Singer +1
In the Standard Model, the box-diagram mediated decay is predicted to occur with an extremely small branching ratio of below , thus providing a safe tes…
Running of Soft Parameters in Extra Space-Time Dimensions
Tatsuo Kobayashi, Jisuke Kubo, Myriam Mondragon +1
The evolution of the parameters including those in the soft supersymmetry-breaking (SSB) sector is studied in the minimal supersymmetric standard model (MSSM) with a certain set of…
Quantum Field Theory on Noncommutative Space-Times and the Persistence of Ultraviolet Divergences
M. Chaichian, A. Demichev, P. Presnajder
We study properties of a scalar quantum field theory on two-dimensional noncommutative space-times. Contrary to the common belief that noncommutativity of space-time would be a key…
Transition times in the Landau-Zener model
N. V. Vitanov
This paper presents analytic formulas for various transition times in the Landau-Zener model. Considerable differences are found between the transition times in the diabatic and ad…
Nonlinear level crossing models
N. V. Vitanov, K. -A. Suominen
We examine the effect of nonlinearity at a level crossing on the probability for nonadiabatic transitions . By using the Dykhne-Davis-Pechukas formula, we derive simple analytic…