Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Mikheev, Aleksandr"'
Autor:
Mikheev, Aleksandr N., Noel, Viktoria, Siovitz, Ido, Strobel, Helmut, Oberthaler, Markus K., Berges, Jürgen
Symmetries play a pivotal role in our understanding of the properties of quantum many-body systems. While there are theorems and a well-established toolbox for systems in thermal equilibrium, much less is known about the role of symmetries and their
Externí odkaz:
http://arxiv.org/abs/2407.17913
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
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
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
Publikováno v:
Phys. Rev. D 105, 116025 (2022)
We use the Hamiltonian formulation of kinetic theory to perform a stability analysis of non-thermal fixed points in a non-Abelian plasma. We construct a perturbative expansion of the Fokker-Planck collision kernel in an adiabatic approximation and sh
Externí odkaz:
http://arxiv.org/abs/2203.02299
Autor:
Makarov, Ilya, Savchenko, Andrey, Korovko, Arseny, Sherstyuk, Leonid, Severin, Nikita, Mikheev, Aleksandr, Babaev, Dmitrii
Many tasks in graph machine learning, such as link prediction and node classification, are typically solved by using representation learning, in which each node or edge in the network is encoded via an embedding. Though there exists a lot of network
Externí odkaz:
http://arxiv.org/abs/2108.08754
Publikováno v:
International Journal of Modern Physics A VOL. 34, NO. 29 (2019)
In this article we give an overview of the concept of universal dynamics near non-thermal fixed points in isolated quantum many-body systems. We outline a non-perturbative kinetic theory derived within a Schwinger-Keldysh closed-time path-integral ap
Externí odkaz:
http://arxiv.org/abs/1810.08143
Publikováno v:
Phys. Rev. A 99, 063622 (2019)
Non-thermal fixed points in the evolution of a quantum many-body system quenched far out of equilibrium manifest themselves in a scaling evolution of correlations in space and time. We develop a low-energy effective theory of non-thermal fixed points
Externí odkaz:
http://arxiv.org/abs/1807.10228
Publikováno v:
Phys. Rev. Lett. 122, 170404 (2019)
Non-equilibrium conditions give rise to classes of universally evolving configurations of quantum-many body systems at non-thermal fixed points. While the fixed point and thus full scaling in space and time is generically reached at very long evoluti
Externí odkaz:
http://arxiv.org/abs/1807.07514