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NIC Symposium 2018 NIC Symposium 2018 22 – 23 February 2018 Forschungszentrum Jülich, Germany Programme Bus Schedule Poster Abstracts Participants Programme Thursday, 22 February 2018 8:30 Transfer from Jülich 9:00 Registration 9:30 Welcome Address by S. M. Schmidt, Member of the Board of Directors, Forschungszentrum Jülich 9:45 Th. Lippert, Forschungszentrum Jülich Supercomputer Evolution at JSC 10:30 Coffee 11:00 T. Korzec, Bergische Universität Wuppertal How Strong are the Strong Interactions? 11:45 C. Urbach, Universität Bonn Hadron-Hadron Interactions from Lattice QCD 12:30 Group Photograph 12:45 Lunch 14:00 L. Pastewka, Universität Freiburg Structure and Mechanical Properties of Cu|Au and Cu|Ni Nanolaminates 14:45 Ch. Scheurer, Technische Universität München Computational Modelling of Solid State Battery Materials 15:30 Coffee 16:00 T. D. Kühne, Universität Paderborn Linear-Scaling Self-Consistent Field Theory Based Molecular Dynamics: Application to C60-Buckyballs Colliding with Graphite 16:45 H.-P. Hsu, Max-Planck-Institut für Polymerforschung, Mainz Effect of Entanglements on Non-Equilibrium Polymer Dynamics 17:30 Poster Session and Reception 19:00 Transfer to Jülich Friday, 23 February 2018 8:30 Transfer from Jülich 9:00 M. Breit, Universität Frankfurt Numerical and High Performance Computing Methods for Multiscale Computational Neuroscience 9:45 M. B. Poulsen, Niels Bohr Institute, University of Copenhagen Southern Ocean Eddy Compensation Examined with a High-Resolution Ocean Model 10:30 Coffee 11:00 J. P. Mellado, Max-Planck-Institut für Meteorologie, Hamburg The Challenge of Small-Scale Turbulence in Planetary Boundary Layers 11:45 F. K. Röpke, Universität Heidelberg Towards Multidimensional Hydrodynamic Simulations of Stars 12:30 Lunch 14:00 C. Burstedde, Universität Bonn Scalable Algorithms for Adaptive Mesh Refinement: Extension to General Element Types and Application to Fluid Dynamics 14:45 A. Fiolitakis, Deutsches Zentrum für Luft- und Raumfahrt, Stuttgart Numerical Investigation of Reacting Flows in Gas Turbine Model Combustors 15:30 Coffee 16:00 S. Trebst, Universität Köln Exact Results for the Many-Electron Problem: Competing Orders in a Nearly Antiferromagnetic Metal 16:45 Th. Voigtmann, Deutsches Zentrum für Luft- und Raumfahrt, Köln Active Brownian Particle Dynamics at High Densities 17:30 End of NIC Symposium 17:45 Transfers to Jülich and to Düren Train Station Bus Schedule Bus is free of charge for participants. Date Departure Meeting Point Destination Time 22 February 08:30 Bus stop „Neues Rathaus“ (in front of Forschungszentrum Jülich, "Stadtverwaltung") Auditorium 19:00 Forschungszentrum Jülich, Auditorium Jülich City, Bus stop „Neues Rathaus“ 23 February 08:30 Bus stop „Neues Rathaus“ (in front of Forschungszentrum Jülich, "Stadtverwaltung") Auditorium 17:45 Forschungszentrum Jülich, Auditorium Jülich City, Bus stop „Neues Rathaus“ Düren Train Station Hotel Kaiserhof Stadthotel Bus Stop "Neues Rathaus" Hotel am Hexenturm Train/Tram Station Rurtalbahn (RTB) "Jülich Bahnhof" Poster Abstracts The number in brackets in front of the title is the number of the movable wall where to place the poster for the poster session. Elementary Particle Physics [E 1] Dynamical Charm Effects on the QCD Static Potential S. Cali, F. Knechtli, T. Korzec, H. Panagopoulos, R. Sommer We evaluate, in the continuum limit, the effects of a dynamical charm quark on the static potential. The size of these effects is calculated through a comparison between quenched QCD and QCD (푁푓 = 2), with two heavy degenerate quarks of mass 푀 = 푀푐, where 푀푐 is the mass of a charm quark. As applications, we also determine the charm loop effects on other related observables that can be extracted from the force between two static color sources, like the strong coupling in the 훼푞푞-scheme and its Renormalization Group 훽푞푞-function. [E 2] Calculating the Proton Radius Using Lattice QCD J. Green, N. Hasan, S. Meinel, M. Engelhardt, S. Krieg, J. Negele, A. Pochinsky, S. Syritsyn The proton charge radius can be measured in experiments, either from the electron-proton scattering cross section or from hydrogen spectroscopy. However, a recent very precise measurement based on spectroscopy of muonic hydrogen is in significant disagreement with earlier results using both methods; this is known as the proton radius puzzle. If confirmed, this would be evidence for a violation of lepton universality, a well-tested principle in particle physics. A first-principles calculation of the proton radius based on lattice quantum chromodynamics could help to understand this puzzle. Typically, this is done by first computing the electric form factor at several values of the momentum transfer, and then performing a fit to determine the charge radius from the slope at zero momentum transfer. We present new methods for directly computing the radius and compare them with an approach based on fitting, in a calculation using one lattice ensemble with the quark masses set to their physical values. [E 3] Axion Mass from Lattice QCD J. N. Guenther We determine the topological susceptibility and the thermodynamical equation of state for temperatures relevant for the axion production in the early Universe. We use lattice QCD with dynamical fermions. We point out several difficulties in these calculations and address them by introducing novel techniques. Assuming the standard QCD axion scenario and no topological defects we obtain a lower bound on the axion mass. [E 4] Investigation of Theories beyond the Standard Model S. Ali, G. Bergner, H. Gerber, P. Giudice, I. Montvay, G. Münster, S. Piemonte, P. Scior The fundamental constituents of matter and the forces between them are splendidly described by the Standard Model of elementary particle physics. Despite its great success, it will be superseded by more comprehensive theories that are able to include phenomena, which are not covered by the Standard Model. Among the attempts in this direction are supersymmetry and Technicolor models. We report about our non-perturbative investigations of the characteristic properties of such models by numerical simulations on high-performance computers. [E 5] The Nature of the QCD Thermal Transition as a Function of Quark Flavours and Masses F. Cuteri, O. Philipsen, A. Sciarra The fundamental theory of the strong interactions is Quantum Chromodynamics (QCD). At high temperatures it predicts a transition from a gas of hadrons (the known nucleons as well as various mesons) to a quark gluon plasma, where the boundaries around the constituents of hadronic matter are lost. The order of this transition depends crucially on the number of dynamical quark flavours and their mass. Understanding this dependence completely is important to constrain the limit of massless quarks as well as the theory at finite baryon number, both of which cannot be simulated directly. [E 6] The Leading Order Hadronic Contribution to the Anomalous Magnetic Moment of the Muon B. Toth The anomalous magnetic moment of the muon is one of the most precisely measured physical quantities. Comparing its experimental value to the theoretical prediction of the Standard Model (SM) provides a stringent test of SM, and a possible disagreement can indicate new physics. The dominant source of uncertainty in the recent theoretical determinations is the hadronic loop corrections arising from the hadronic vacuum polarization (HVP). Due to the large coupling constant of the strong interaction at low energies, the HVP contribution is only accessible by non-perturbative methods. Here we apply lattice QCD to address these hadronic contributions non-perturbatively. Our calculations include all contributions from the u, d, s, and c quarks, directly at the physical values of their masses, in their quark-connected and quark-disconnected configurations. We find that our value for the leading order hadronic contribution to the anomalous magnetic moment of the muon, within its combined error of 2.7%, is compatible with the current experimental results. [E 7] Nucleon Sigma Terms, Corrections to Dashen's Theorem and the Light Quark Mass Ratio from Lattice QCD L. Varnhorst We present a QCD calculation of the u, d, and s scalar quark contents of nucleons based on 47 lattice ensembles with 푁푓 = 2 + 1 dynamical sea quarks, 5 lattice spacings down to 0.054 fm, lattice sizes up to 6 fm, and pion masses down to 120 MeV. Using the Feynman- Hellmann theorem, we obtain 푓푢푑, 푁 = 0.0405(40)(35) and 푓푠, N = 0.113(45)(40), which translates into 휎휋, N = 38(3)(3) MeV, 휎푠, N = 105(41)(37) MeV for the sigma terms, where the first errors are statistical and the second errors are systematic. Using isospin relations, we also compute the individual up and down quark contents of the proton and neutron. Based on the 푁푓 = 2 + 1 QCD simulations to which QED effects have been added in a partially quenched setup we determine the corrections to Dashen’s theorem and the individual up and down quark masses. For the parameter which quantifies violations to Dashen’s theorem, we obtain 휀 = 0.73(2)(5)(17), where the third error is an estimate of the QED quenching error. For the light quark masses we obtain, 푚푢 = 2.27(6)(5)(4) MeV and 푚푑 = 4.67(6)(5)(4) MeV in the modified minimal subtraction scheme at 2 GeV and the isospin breaking ratios 푚 푢 = 0.485(11)(8)(14), 푅 = 38.2(1.1)(0.8)(1.4), and 푄 = 23.4(0.4)(0.3)(0.4). Our results ⁄푚푑 exclude the 푚푢 = 0 solution to the strong CP problem by more than 24 standard deviations. [E 8] Extended Investigation of the 12 Flavor Beta Function Z. Fodor, K. Holland, J. Kuti, S. Mondal , D. Nogradi, C. H. Wong We report on continued studies of the non-perturbative beta function in SU(3) gauge theory with 12 fundamental massless flavors, a model which remains controversial as to the existence of an infrared fixed point. We extend our previous work (Phys. Rev. D94 (2016) no.9, 091501) to stronger gauge couplings and test conformality for this model.
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