Zobrazeno 1 - 10
of 162
pro vyhledávání: '"Stefan Boettcher"'
Autor:
Stefan Boettcher
Publikováno v:
Frontiers in Physics, Vol 12 (2024)
We present a collection of simulations of the Edwards–Anderson lattice spin glass at T=0 to elucidate the nature of low-energy excitations over a range of dimensions that reach from physically realizable systems to the mean-field limit. Using heuri
Externí odkaz:
https://doaj.org/article/9ca6cceb56a54ae28800be6a26b5b9ef
Autor:
Stefan Boettcher
Publikováno v:
Nature Communications, Vol 14, Iss 1, Pp 1-3 (2023)
Externí odkaz:
https://doaj.org/article/3a6171ad5582427ab678fa45bfdb9f44
Autor:
Stefan Boettcher
Publikováno v:
Physical Review Research, Vol 2, Iss 2, p 023411 (2020)
We discuss the model of a one-dimensional, discrete-time walk on a line with spatial heterogeneity in the form of a variable set of ultrametric barriers. Inspired by the homogeneous quantum walk on a line, we develop a formalism by which the classica
Externí odkaz:
https://doaj.org/article/f96e0d7fe89b4d038b5ad2968988b635
Autor:
Stefan Boettcher
Publikováno v:
Physical Review Research, Vol 1, Iss 3, p 033142 (2019)
We analyze the transformation of quadratic unconstrained binary optimization (QUBO) from its conventional Boolean presentation into an equivalent spin-glass problem with coupled ±1 spin variables exposed to a site-dependent external field. We find t
Externí odkaz:
https://doaj.org/article/eb40b2a5a1814a5fbcc81623c537f41c
Autor:
Stephan Laggai, Sonja M. Kessler, Stefan Boettcher, Valérie Lebrun, Katja Gemperlein, Eva Lederer, Isabelle A. Leclercq, Rolf Mueller, Rolf W. Hartmann, Johannes Haybaeck, Alexandra K. Kiemer
Publikováno v:
Journal of Lipid Research, Vol 55, Iss 6, Pp 1087-1097 (2014)
Liver-specific overexpression of the insulin-like growth factor 2 (IGF2) mRNA binding protein p62/IGF2BP2-2 induces a fatty liver, which highly expresses IGF2. Because IGF2 expression is elevated in patients with steatohepatitis, the aim of our study
Externí odkaz:
https://doaj.org/article/0283ff4865f744bf9a3cfc33e5226500
Autor:
Stefan Boettcher
Publikováno v:
Nature Machine Intelligence. 5:24-25
In Nature Machine Intelligence 4, 367 (2022), Schuetz et al provide a scheme to employ graph neural networks (GNN) as a heuristic to solve a variety of classical, NP-hard combinatorial optimization problems. It describes how the network is trained on
Autor:
Richa Sharma, Stefan Boettcher
We study transport within a spatially heterogeneous one-dimensional quantum walk with a combination of hierarchical and random barriers. Recent renormalization group calculations for a spatially disordered quantum walk with a regular hierarchy of bar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9a2cdb2a823c25dd12646328a7761716
http://arxiv.org/abs/2205.09308
http://arxiv.org/abs/2205.09308
Autor:
Stefan Boettcher, Paula A. Gago
Publikováno v:
Proceedings of the National Academy of Sciences of the United States of America
Significance We explore the compaction dynamics of a granular pile after a hard quench from a liquid into the glassy regime. First, we establish that the otherwise athermal granular pile during tapping exhibits annealing behavior comparable to glassy
Autor:
Paula Alejandra Gago, Stefan Boettcher
Publikováno v:
Science Advances
Description
The grain-scale dynamics of the internal energy inside a tapped granular pile is studied, advancing on a kinetic theory of grains.
The transition into a glassy state of the ensemble of static, mechanically stable configurations
The grain-scale dynamics of the internal energy inside a tapped granular pile is studied, advancing on a kinetic theory of grains.
The transition into a glassy state of the ensemble of static, mechanically stable configurations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::78f82cd3d0927a7ae9ea727d814c53f4
http://hdl.handle.net/10044/1/93032
http://hdl.handle.net/10044/1/93032
Publikováno v:
Sibani, P, Boettcher, S & Jensen, H J 2021, ' Record dynamics of evolving metastable systems : theory and applications ', European Physical Journal B. Condensed Matter and Complex Systems, vol. 94, no. 1, 37 . https://doi.org/10.1140/epjb/s10051-020-00039-x
Abstract Record Dynamics (RD) deals with complex systems evolving through a sequence of metastable stages. These are macroscopically distinguishable and appear stationary, except for the sudden and rapid changes, called quakes, which induce the trans
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ae0356fcbfdfbdf1b4a4aa2bdcb5b26a
http://hdl.handle.net/10044/1/88303
http://hdl.handle.net/10044/1/88303