Results 41 to 50 of about 2,430,073 (342)
Integrable sigma models and perturbed coset models [PDF]
, 2001 Sigma models arise frequently in particle physics and condensed-matter physics as low-energy effective theories. In this paper I compute the exact free energy at any temperature in two hierarchies of integrable sigma models in two dimensions.
Fendley, Paul
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Three dimensional conformal sigma models [PDF]
, 2007 We construct novel conformal sigma models in three dimensions. Nonlinear sigma models in three dimensions are nonrenormalizable in perturbation theory. We use Wilsonian renormalization group equation method to find the fixed points.
Higashi, Takeshi +2 more
core +4 more sources
Journal of Noncommutative Geometry, 2011 We begin to study a sigma-model in which both the spacetime manifold and the two-dimensional string world-sheet are made noncommutative. We focus on the case where both the spacetime manifold and the two-dimensional string world-sheet are replaced by noncommutative 2-tori.
Varghese, M., Rosenberg, J.
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Supergravity solution-generating techniques and canonical transformations of σ-models from O(D, D)
Journal of High Energy Physics, 2021 Within the framework of the flux formulation of Double Field Theory (DFT) we employ a generalised Scherk-Schwarz ansatz and discuss the classification of the twists that in the presence of the strong constraint give rise to constant generalised fluxes ...
Riccardo Borsato, Sibylle Driezen
doaj +1 more source
βγ-systems interacting with sigma-models
Journal of High Energy Physics, 2020 We find a geometric description of interacting βγ-systems as a null Kac-Moody quotient of a nonlinear sigma-model for systems with varying amounts of supersymmetry.
Ulf Lindström, Martin Roček
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Spin fields for the spinning particle
Journal of High Energy Physics, 2022 We propose an analogue of spin fields for the relativistic RNS-particle in 4 dimensions, in order to describe Ramond-Ramond states as “two-particle” excitations on the world line.
E. Boffo, I. Sachs
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The randomization by Wishart laws and the Fisher information [PDF]
arXiv, 2022 Consider the centered Gaussian vector $X$ in $\R^n$ with covariance matrix $ \Sigma.$ Randomize $\Sigma$ such that $ \Sigma^{-1}$ has a Wishart distribution with shape parameter $p>(n-1)/2$ and mean $p\sigma.$ We compute the density $f_{p,\sigma}$ of $X$ as well as the Fisher information $I_p(\sigma)$ of the model $(f_{p,\sigma} )$ when $\sigma $ is ...
arxiv
Subsampling effects in neuronal avalanche distributions recorded
BMC Neuroscience, 2009 Background Many systems in nature are characterized by complex behaviour where large cascades of events, or avalanches, unpredictably alternate with periods of little activity. Snow avalanches are an example.
Munk Matthias HJ +2 more
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Grassmannian heterotic sigma model [PDF]
Physical Review D, 2019 21 pages, 6 ...
Michael Kreshchuk +3 more
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Dirac Sigma Models from Gauging [PDF]
, 2013 The G/G WZW model results from the WZW-model by a standard procedure of gauging. G/G WZW models are members of Dirac sigma models, which also contain twisted Poisson sigma models as other examples.
Salnikov, Vladimir, Strobl, Thomas
core +5 more sources