Zobrazeno 1 - 10
of 214
pro vyhledávání: '"Gerber, Urs"'
Autor:
Edwards, James P., Gerber, Urs, Schubert, Christian, Trejo, Maria Anabel, Tsiftsi, Thomai, Weber, Axel
In recent years efficient algorithms have been developed for the numerical computation of relativistic single-particle path integrals in quantum field theory. Here, we adapt this "worldline Monte Carlo" approach to the standard problem of the numeric
Externí odkaz:
http://arxiv.org/abs/1903.00536
Autor:
Bietenholz, Wolfgang, de Forcrand, Philippe, Gerber, Urs, Mejía-Díaz, Héctor, Sandoval, Ilya O.
Publikováno v:
Phys. Rev. D 98, 114501 (2018)
The 2d O(3) model is widely used as a toy model for ferromagnetism and for Quantum Chromodynamics. With the latter it shares --- among other basic aspects --- the property that the continuum functional integral splits into topological sectors. Topolo
Externí odkaz:
http://arxiv.org/abs/1808.08129
Quantum simulations would be highly desirable in order to investigate the finite density physics of QCD. $(1+1)$-d $\mathbb{C}P(N-1)$ quantum field theories are toy models that share many important features of QCD: they are asymptotically free, have
Externí odkaz:
http://arxiv.org/abs/1803.04767
Autor:
Mejía-Díaz, Héctor, Bietenholz, Wolfgang, Cichy, Krzysztof, de Forcrand, Philippe, Dromard, Arthur, Gerber, Urs, Sandoval, Ilya O.
We study the impact of the Gradient Flow on the topology in various models of lattice field theory. The topological susceptibility $\chi_{\rm t}$ is measured directly, and by the slab method, which is based on the topological content of sub-volumes (
Externí odkaz:
http://arxiv.org/abs/1712.01395
Autor:
Sandoval, Ilya O., Bietenholz, Wolfgang, de Forcrand, Philippe, Gerber, Urs, Mejía-Díaz, Héctor
The 2d Heisenberg model --- or 2d O(3) model --- is popular in condensed matter physics, and in particle physics as a toy model for QCD. Along with other analogies, it shares with 4d Yang-Mills theories, and with QCD, the property that the configurat
Externí odkaz:
http://arxiv.org/abs/1709.06180
Publikováno v:
Phys. Rev. E 97, 042114 (2018)
We introduce two new integral transforms of the quantum mechanical transition kernel that represent physical information about the path integral. These transforms can be interpreted as probability distributions on particle trajectories measuring resp
Externí odkaz:
http://arxiv.org/abs/1709.04984
We study the ground state energy and the critical screening parameter of the Yukawa potential in non-relativistic quantum mechanics. After a short review of the existing literature on these quantities, we apply fifth-order perturbation theory to the
Externí odkaz:
http://arxiv.org/abs/1706.09979
Autor:
Bietenholz, Wolfgang, Gerber, Urs
Publikováno v:
Rev. Cub. Fis. 33 (2016) 156-168
The 2016 Physics Nobel Prize honors a variety of discoveries related to topological phases and phase transitions. Here we sketch two exciting facets: the groundbreaking works by John Kosterlitz and David Thouless on phase transitions of infinite orde
Externí odkaz:
http://arxiv.org/abs/1612.06132
Recently the simulation of quantum field theories using man-made physical systems has become realistic. In this publication we present numerical results which support the use of quantum simulation experiments to study quantum field theories at non-ze
Externí odkaz:
http://arxiv.org/abs/1610.08826
In simulations of a model with topological sectors, algorithms which proceed in small update steps tend to get stuck in one sector, especially on fine lattices. This distorts the numerical results; in particular it is not straightforward to measure t
Externí odkaz:
http://arxiv.org/abs/1610.00685