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DESY Zeuthen

As seen in: Physical Review B
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Articles

$\ensuremath{\eta}\ensuremath{\rightarrow}{\ensuremath{\gamma}}^{*}{\ensuremath{\gamma}}^{*}$ transition form factor and the hadronic light-by-light $\ensuremath{\eta}$-pole contribution to the muon $g\ensuremath{-}2$ from lattice QCD

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By Computation-Based Science, DESY Zeuthen, Rheinische Friedrich-Wilhelms-Universität Bonn, Institut für Kernphysik
| Physical Review B
Constantia Alexandrou1,2, Simone Bacchio2, Sebastian Burri3, Jacob Finkenrath2, Andrew Gasbarro3, Kyriakos Hadjiyiannakou1,2, Karl Jansen4, Gurtej Kanwar3, Bartosz Kostrzewa5, Konstantin Ottnad6, Marcus Petschlies7,8, Ferenc Pittler2, Carsten Urbach7,8, and Urs Wenger3 (Extended Twisted Mass Collaboration) 1Department of Physics, University of Cyprus, Nicosia, Cyprus 2Computation-based Science and Technology Research Center, The Cyprus Institute, Nicosia, Cyprus 3Albert Einstein Center,...
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Exploring the $CP$-violating Dashen phase in the Schwinger model with tensor networks

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By Lena Funcke, Karl Jansen, DESY Zeuthen, Stefan Kühn
| Physical Review B
Abstract We numerically study the phase structure of the two-flavor Schwinger model with matrix product states, focusing on the (1+1)-dimensional analog of the CP-violating Dashen phase in QCD. We simulate the two-flavor Schwinger model around the point where the positive mass of one fermion flavor corresponds to the negative mass of the other fermion flavor, which is a sign-problem afflicted regime for conventional Monte Carlo techniques.
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Remnants of the nonrelativistic Casimir effect on the lattice

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By Kei Suzuki, Katsumasa Nakayama, DESY Zeuthen
| Physical Review B
Abstract The Casimir effect is a fundamental quantum phenomenon induced by the zero-point energy for a quantum field. It is well known for relativistic fields with a linear dispersion relation, while its existence or absence for nonrelativistic fields with a quadratic dispersion is an unsettled question. Here, we investigate the Casimir effects for various dispersion relations on the lattice.
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