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pro vyhledávání: '"Hansen, P. W."'
The method of complex Langevin simulations is a tool that can be used to tackle the complex-action problem encountered, for instance, in finite-density lattice quantum chromodynamics or real-time lattice field theories. The method is based on a stoch
Externí odkaz:
http://arxiv.org/abs/2410.13423
Autor:
Hansen, Michael W., Sexty, Dénes
We study complex Langevin simulations of a toy model as well as QCD, supplemented with a dynamical stabilization (DS) term, which was proposed to regularize the complexified process at lower temperatures. We compare the results to reweghting from zer
Externí odkaz:
http://arxiv.org/abs/2405.20709
Autor:
Valencia, Cuauhtemoc Nuñez, Lomholdt, William Bang, Larsen, Matthew Helmi Leth, Hansen, Thomas W., Schiøtz, Jakob
Publikováno v:
Nanoscale 16, 5750 (2024)
We develop a combined theoretical and experimental method for estimating the amount of heating that occurs in metallic nanoparticles that are being imaged in an electron microscope. We model the thermal transport between the nanoparticle and the supp
Externí odkaz:
http://arxiv.org/abs/2309.16239
Autor:
Larsen, Matthew Helmi Leth, Lomholdt, William Bang, Valencia, Cuauhtemoc Nuñez, Hansen, Thomas W., Schiøtz, Jakob
Publikováno v:
Ultramicroscopy 253, (2023) 113803
Motivated by the need for low electron dose transmission electron microscopy imaging, we report the optimal frame dose (i.e. $e^-/A^{2}$) range for object detection and segmentation tasks with neural networks. The MSD-net architecture shows promising
Externí odkaz:
http://arxiv.org/abs/2302.12629
Autor:
Hansen, Michael W., Sexty, Dénes
Lattice simulations of non-zero density QCD introduce the so-called sign problem (complex or negative probabilities), which invalidates importance sampling methods. To circumvent this, we use the Complex Langevin Equation (CLE), to measure the bounda
Externí odkaz:
http://arxiv.org/abs/2212.12029
Autor:
Tutueanu, Ana-Elena, Kamminga, Machteld E., Tejsner, Tim B., Jacobsen, Henrik, Hansen, Henriette W., Lacatusu, Monica-Elisabeta, Baas, Jacob, Eliasen, Kira L., Grivel, Jean-Claude, Sassa, Yasmine, Christensen, Niels Bech, Steffens, Paul, Boehm, Martin, Piovano, Andrea, Lefmann, Kim, Rømer, Astrid T.
We present triple-axis neutron scattering studies of low-energy magnetic fluctuations in strongly underdoped La$_{2-x}$Sr$_{x}$CuO$_{4}$ with $x=0.05$, $0.06$ and $0.07$, providing quantitative evidence for a direct competition between these fluctuat
Externí odkaz:
http://arxiv.org/abs/2211.01733
Autor:
Larsen, Matthew Helmi Leth, Dahl, Frederik, Hansen, Lars P., Barton, Bastian, Kisielowski, Christian, Helveg, Stig, Winther, Ole, Hansen, Thomas W., Schiøtz, Jakob
Publikováno v:
Ultramicroscopy 243, 113641 (2023)
Reconstruction of the exit wave function is an important route to interpreting high-resolution transmission electron microscopy (HRTEM) images. Here we demonstrate that convolutional neural networks can be used to reconstruct the exit wave from a sho
Externí odkaz:
http://arxiv.org/abs/2112.14308
In complex Langevin simulations, the insufficient decay of the probability density near infinity leads to boundary terms that spoil the formal argument for correctness. We present a formulation of this term that is cheaply measurable in lattice model
Externí odkaz:
http://arxiv.org/abs/2112.02924
This work employs the spectral reconstruction approach of Ref. [1] to determine an inclusive rate in the $1+1$ dimensional O(3) non-linear $\sigma$-model, analogous to the QCD part of ${e}^+{e}^- \rightarrow \rm {hadrons}$. The Euclidean two-point co
Externí odkaz:
http://arxiv.org/abs/2111.12774
Autor:
Webb, James L., Troise, Luca, Hansen, Nikolaj W., Frellsen, Louise F., Osterkamp, Christian, Jelezko, Fedor, Jankuhn, Steffen, Meijer, Jan, Berg-Sørensen, Kirstine, Perrier, Jean-François, Huck, Alexander, Andersen, Ulrik Lund
The ability to measure the passage of electrical current with high spatial and temporal resolution is vital for applications ranging from inspection of microscopic electronic circuits to biosensing. Being able to image such signals passively and remo
Externí odkaz:
http://arxiv.org/abs/2107.14156