# Preprints

 2017-04-2619:14 [FZJ-2017-03272] Preprint et al LFP beta amplitude is predictive of mesoscopic spatio-temporal phase patterns 2017-03-1712:08 [FZJ-2017-02203] Preprint Helias, M. Distributions of covariances as a window into the operational regime of neuronal networks 2017-01-1612:46 [FZJ-2017-00451] Preprint et al Renormalization of the three-boson system with short-range interactions revisited We consider renormalization of the three-body scattering problem in low-energy effective field theory of self-interacting scalar particles by applying time-ordered perturbation theory to the manifestly Lorentz-invariant formulation. The obtained leading-order equation is perturbatively renormalizable and non-perturbatively finite and does not require a three-body counter term in contrast to its non-relativistic approximation.. OpenAccess: PDF PDF (PDFA); 2016-11-2912:56 [FZJ-2016-06938] Preprint Brown, P. J. Temperature evolution of magnetic structure of HoFeO$_3$ by single crystal neutron diffraction We have investigated the temperature evolution of the magnetic structures of HoFeO$_3$ by single crystal neutron diffraction. The three different magnetic structures found as a function of temperature for \hfo\ are described by the magnetic groups Pb$2_1$, Pbn$2_1$ and Pbn$2_1$ and are stable in the temperature ranges $\approx$ 600-55~K, 55-37~K and 35$>T>2$~K respectively. [...] OpenAccess: PDF PDF (PDFA); External link: Fulltext 2016-11-2309:28 [FZJ-2016-06590] Preprint et al Photon asymmetry measurements of $\overrightarrow{\gamma} \mathrm{p} \rightarrow \pi^{0} \mathrm{p}$ for E$_{\gamma}$=320$-$650 MeV High statistics measurements of the photon asymmetry $\mathrm{\Sigma}$ for the $\overrightarrow{\gamma}$p$\rightarrow\pi^{0}$p reaction have been made in the center of mass energy range W=1214-1450 MeV. The data were measured with the MAMI A2 real photon beam and Crystal Ball/TAPS detector systems in Mainz, Germany. [...] OpenAccess: PDF PDF (PDFA); 2016-11-2309:27 [FZJ-2016-06589] Preprint et al Measurement of the omega -> pi^0 e^+e^- and eta -> e^+e^-g Dalitz decays with the A2 setup at MAMI The Dalitz decays eta -> e^+e^-g and omega -> pi^0 e^+e^- have been measured in the g p -> eta p and g p -> omega p reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of the electromagnetic transition form factor of eta, Lambda^{-2}_eta=(1.97+/-0.13_tot) GeV^{-2}, is in good agreement with previous measurements of the eta -> e^+e^-g and eta -> mu^+mu^-g decays. [...] OpenAccess: PDF PDF (PDFA); 2016-10-2007:52 [FZJ-2016-05483] Preprint/Report Schumann, D. Assessment of the acceptance of energy systems transformation [STE Preprint 20/2016] 2016-10-1818:09 [FZJ-2016-05452] Preprint et al High-Performance Computing in Neuroscience for Data-Driven Discovery, Integration, and Dissemination. 2016-01-2214:24 [FZJ-2016-00929] Preprint/Report et al Massive photons: an infrared regularization scheme for lattice QCD+QED [MIT-CTP/4691, JLAB-THY-15-2112, NT@WM-15-12] The commonly adopted approach for including electromagnetic interactions in lattice QCD simulations relies on using finite volume as the infrared regularization for QED. The long-range nature of the electromagnetic interaction, however, implies that physical quantities are susceptible to power-law finite volume corrections, which must be removed by performing costly simulations at multiple lattice volumes, followed by an extrapolation to the infinite volume limit. [...] OpenAccess: PDF PDF (PDFA); 2016-01-2212:06 [FZJ-2016-00916] Preprint Lähde, T. Quantum Monte Carlo Calculations for Carbon Nanotubes We show how lattice Quantum Monte Carlo can be applied to the electronic properties of carbon nanotubes in the presence of strong electron-electron correlations. We employ the path-integral formalism and use methods developed within the lattice QCD community for our numerical work. [...] OpenAccess: PDF PDF (PDFA);