Results 21 to 30 of about 198,762 (324)
Brain magnetic resonance imaging predictors in anti‐N‐methyl‐D‐aspartate receptor encephalitis
Annals of Clinical and Translational Neurology, Volume 9, Issue 12, Page 1974-1984, December 2022., 2022 Abstract Objective Brain magnetic resonance imaging (MRI) findings in anti‐N‐methyl‐D‐aspartate receptor (NMDAR) encephalitis are nonspecific and rarely have obvious associations with clinical characteristics and outcomes. This study aimed to comprehensively describe the MRI features of patients with NMDAR encephalitis, examine their associations with ...
Ying‐Ying Zhao +8 more
wiley +1 more source
Galileons with Gauge Symmetries [PDF]
Physical Review D, 2012 Galileon models arise in certain braneworld scenarios as modifications to General Relativity, and are also interesting as field theories in their own right. We show how the galileon model can be naturally generalized to include local gauge symmetries, by allowing for couplings to Yang-Mills fields.
Shuang-Yong Zhou, Edmund J. Copeland
openaire +3 more sources
Recognizing early MRI signs (or their absence) is crucial in diagnosing metachromatic leukodystrophy
Annals of Clinical and Translational Neurology, Volume 9, Issue 12, Page 1999-2009, December 2022., 2022 Abstract Objectives Metachromatic leukodystrophy (MLD) has characteristic white matter (WM) changes on brain MRI, which often trigger biochemical and genetic confirmation of the diagnosis. In early or pre‐symptomatic disease stages, these typical MRI changes might be absent, hampering early diagnosis.
Daphne H. Schoenmakers +7 more
wiley +1 more source
Gauge Symmetries, Symmetry Breaking, and Gauge-Invariant Approaches
, 2023 Gauge symmetries play a central role, both in the mathematical foundations as well as the conceptual construction of modern (particle) physics theories. However, it is yet unclear whether they form a necessary component of theories, or whether they can be eliminated. It is also unclear whether they are merely an auxiliary tool to simplify (and possibly
Berghofer, Philipp +6 more
openaire +3 more sources
Gauge symmetries and structure of proteins [PDF]
EPJ Web of Conferences, 2017 8 pages, 5 figures. Prepared for the proceedings of the XII Quark Confinement and the Hadron Spectrum, 29 August to 3 September 2016, Thessaloniki ...
Alexander Molochkov +4 more
openaire +7 more sources
Data‐driven performance metrics for neural network learning
International Journal of Adaptive Control and Signal Processing, EarlyView., 2023 Summary Effectiveness of data‐driven neural learning in terms of both local mimima trapping and convergence rate is addressed. Such issues are investigated in a case study involving the training of one‐hidden‐layer feedforward neural networks with the extended Kalman filter, which reduces the search for the optimal network parameters to a state ...
Angelo Alessandri +2 more
wiley +1 more source
Fractons, dipole symmetries and curved spacetime
SciPost Physics, 2022 We study complex scalar theories with dipole symmetry and uncover a no-go theorem that governs the structure of such theories and which, in particular, reveals that a Gaussian theory with linearly realised dipole symmetry must be Carrollian.
Leo Bidussi, Jelle Hartong, Emil Have, Jørgen Musaeus, Stefan Prohazka
doaj +1 more source
Symmetry-enriched quantum spin liquids in (3 + 1)d
Journal of High Energy Physics, 2020 We use the intrinsic one-form and two-form global symmetries of (3+1)d bosonic field theories to classify quantum phases enriched by ordinary (0-form) global symmetry. Different symmetry-enriched phases correspond to different ways of coupling the theory
Po-Shen Hsin, Alex Turzillo
doaj +1 more source
Gauge Symmetry Restoration by Higgs Condensation in Flux Compactifications on Coset Spaces [PDF]
, 2021 Extra-dimensional components of gauge fields in higher-dimensional gauge theories will play a role of the Higgs field and become tachyonic after Kaluza-Klein compactifications on internal spaces with (topologically nontrivial) gauge field backgrounds. Its condensation is then expected to break gauge symmetries spontaneously.
arxiv +1 more source
Comparing dualities and gauge symmetries [PDF]
Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics, 2017 We discuss some aspects of the relation between dualities and gauge symmetries. Both of these ideas are of course multi-faceted, and we confine ourselves to making two points. Both points are about dualities in string theory, and both have the 'flavour' that two dual theories are 'closer in content' than you might think.
Jeremy Butterfield +4 more
openaire +4 more sources