Conveners
Application beyond QCD: Parallel 7C
- Doug Toussaint
Application beyond QCD: Parallel 8G
- Eigo Shintani (Mainz University)
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Dr Benjamin Svetitsky (Tel Aviv University)26/06/2014, 14:15Applications Beyond QCDTalkWe have carried out a Schrodinger-functional calculation for the Abelian gauge theory with Nf=2 four-component fermions in three dimensions. We find no fixed point in the beta function, meaning that the theory is confining rather than conformal.Go to contribution page
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Mr Daniel Körner (FSU Jena)26/06/2014, 14:35Applications Beyond QCDTalkWe study the non-perturbative renormalization group flow of the nonlinear O(N) sigma model in two and three space-time dimensions using a scheme that combines an effective local Hybrid Monte Carlo update routine, blockspin transformations and a Monte Carlo demon method. In two dimensions our results verify perturbative renormalizability. In three dimensions, we determine the flow...Go to contribution page
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Dr Maksim Ulybyshev (Regensburg University)26/06/2014, 14:55Applications Beyond QCDTalkTight-binding model of Graphene with vacancies in crystal structure was studied within the framework of Hybrid Monte Carlo simulations. Antiferromagnetic ordering is observed in the vicinity of the vacant sites. Mass gap is extracted from the calculations of the two-point Euclidean Green function. It is demonstrated that even a relatively small concentration of vacancies can lead to opening a...Go to contribution page
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Mr Alexander Nikolaev (Far Eastern Federal University)26/06/2014, 15:15Applications Beyond QCDTalkTight-binding model of the AA-stacked bilayer graphene with screened electron-electron interactions has been studied using the Hybrid Monte Carlo simulations on the original double-layer hexagonal lattice. Instantaneous screened Coulomb potential is taken into account using Hubbard-Stratonovich transformation. G-type antiferromagnetic ordering has been studied and the phase transition with...Go to contribution page
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Dr Dominik Smith (TU Darmstadt)26/06/2014, 15:35Applications Beyond QCDTalkWe report on the status of our ongoing Hybrid-Monte-Carlo simulations of the tight-binding model for the electronic properties of graphene, using a realistic potential for the two-body interactions. Our short-range interactions thereby include the partial screening due to electrons in higher energy states from ab initio calculations based on the constrained random phase approximation...Go to contribution page
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Dr Oleg Pavlovskiy (Moscow State University)26/06/2014, 15:55Applications Beyond QCDTalkNew formulation of path integrals for relativistic quantum systems will discussed. Influence of the relativistic effects on the properties of quantum systems will be studied by means of the Monte Carlo method. A generalization of this approach to the case the path integral quantization of the Born-Infeld field theory will also discussed.Go to contribution page
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Mr Semen Valgushev (Institute for Theoretical and Experimental Physics)26/06/2014, 16:15Applications Beyond QCDTalkThe results of numerical simulation of graphene effective field theory in external magnetic field are presented. The numerical simulation is performed using noncompact (3+1)-dimensional Abelian lattice gauge fields and (2+1)-dimensional staggered lattice fermions. The dependences of fermion condensate and conductivity on the dielectric permittivity of the substrate for different values of...Go to contribution page
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Ms Emilie Huffman (Duke University)27/06/2014, 14:15Applications Beyond QCDTalkWe present a solution to the sign problem in a class of particle-hole symmetric Hamiltonian lattice fermion models on bipartite lattices using the idea of fermion bags. The solution remains valid when the particle hole symmetry is broken through a staggered chemical potential term. This solution allows, for the first time, simulations of some massless four-fermion models with minimal...Go to contribution page
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Dr Mateusz Koren (IFT UAM-CSIC Madrid)27/06/2014, 14:35Applications Beyond QCDTalkWe analyze 2+1 dimensional Yang-Mills theory regularized on a lattice with twisted boundary conditions in the spatial directions. In previous work it was shown that the observables in the non-zero electric flux sectors obey the so-called x-scaling, i.e. depend only on the variable x~NL/b and the magnetic flux, given by the parameters of the twist (L being the length of the spatial torus and b...Go to contribution page
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Dr Axel Maas (University of Jena)27/06/2014, 14:55Applications Beyond QCDTalkThe Higgs sector of the standard model, the Higgs and the W/Z bosons, is a quite peculiar theory. Because of the Higgs effect, in some cases the observable particles, i.e. gauge-invariant bound states, have the same mass as the elementary particles. This is what makes perturbation theory in the electroweak sector possible. Under which condition this holds true is not only important for...Go to contribution page
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Dr Pavel Buividovich (Regensburg University)27/06/2014, 15:15Applications Beyond QCDTalkWe study interacting Dirac fermions with chiral imbalance (modelled by a chiral chemical potential) in the mean-field approximation and find that the chiral imbalance is strongly enhanced due to spontaneous chiral symmetry breaking. We then consider the Chiral Magnetic Effect (CME) in the linear response approximation and find that in a phase with broken chiral symmetry the CME current is...Go to contribution page
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Ms Jana Günther (Bergische Universität Wuppertal)27/06/2014, 15:35Applications Beyond QCDTalkSince the discovery of the Higgs particle at the LHC it is possible to investigate the equation of state for the electro weak transition in the SU(2)-Higgs-model at physical parameters. We will present a line of constant physics and preliminary results on the equation of state for small Nt values. The data was obtained by simulation with a combined heatbath and overrelaxation algorithm.Go to contribution page