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pro vyhledávání: '"Gasenzer, Thomas"'
Wilson's renormalization-group approach to the weakly-interacting single-component Bose gas is discussed within the symmetry-broken, condensate phase. Extending upon the work by Bijlsma and Stoof [Phys. Rev. A 54, 5085 (1996), see http://doi.org/10.1
Externí odkaz:
http://arxiv.org/abs/2402.19239
Autor:
Siovitz, Ido, Heinen, Philipp, Rasch, Niklas, Lannig, Stefan, Deller, Yannick, Strobel, Helmut, Oberthaler, Markus, Gasenzer, Thomas
High-performance graphical processing units (GPU) are used for the repeated parallelised propagation of non-linear partial differential equations on large spatio-temporal grids. The main challenge results as a combination of the requirement of large
Externí odkaz:
http://arxiv.org/abs/2310.03636
Autor:
Lannig, Stefan, Prüfer, Maximilian, Deller, Yannick, Siovitz, Ido, Dreher, Jan, Gasenzer, Thomas, Strobel, Helmut, Oberthaler, Markus K.
Close to equilibrium, the underlying symmetries of a system determine its possible universal behavior. Far from equilibrium, however, different universal phenomena associated with the existence of multiple non-thermal fixed points can be realized for
Externí odkaz:
http://arxiv.org/abs/2306.16497
Closed quantum systems far from thermal equilibrium can show universal dynamics near attractor solutions, known as non-thermal fixed points, generically in the form of scaling behavior in space and time. A systematic classification and comprehensive
Externí odkaz:
http://arxiv.org/abs/2304.12464
Autor:
Siovitz, Ido, Lannig, Stefan, Deller, Yannick, Strobel, Helmut, Oberthaler, Markus K., Gasenzer, Thomas
Universal scaling dynamics of a many-body system far from equilibrium signals the proximity of the time-evolution to a non-thermal fixed point. We find universal dynamics connected with rogue-wave like events in the mutually coupled magnetic componen
Externí odkaz:
http://arxiv.org/abs/2304.09293
Autor:
Heinen, Philipp, Gasenzer, Thomas
Numerical simulations of the full quantum properties of interacting many-body systems by means of field-theoretic Monte-Carlo techniques are often limited due to a sign problem. Here we simulate properties of a dilute two-dimensional Bose gas in the
Externí odkaz:
http://arxiv.org/abs/2304.05699
We extend the theory of non-thermal fixed points to the case of anomalously slow universal scaling dynamics according to the sine-Gordon model. This entails the derivation of a kinetic equation for the momentum occupancy of the scalar field from a no
Externí odkaz:
http://arxiv.org/abs/2212.01163
We examine coarsening of field-excitation patterns of the sine-Gordon (SG) model, in two and three spatial dimensions, identifying it as universal dynamics near non-thermal fixed points. The SG model is relevant in many different contexts, from solit
Externí odkaz:
http://arxiv.org/abs/2212.01162
Autor:
Heinen, Philipp, Gasenzer, Thomas
Quantitative numerical analyses of interacting dilute Bose-Einstein condensates are most often based on semi-classical approximations. Since the complex-valued field-theoretic action of the Bose gas does not offer itself to the direct application of
Externí odkaz:
http://arxiv.org/abs/2204.10661
Publikováno v:
Phys. Rev. E 105, 045315 (2022)
Path integrals with complex actions are encountered for many physical systems ranging from spin- or mass-imbalanced atomic gases and graphene to quantum chromo-dynamics at finite density to the non-equilibrium evolution of quantum systems. Many compu
Externí odkaz:
http://arxiv.org/abs/2106.09367