منابع مشابه
Deformations and Geometric Cosets *
I review some marginal deformations of SU(2) and SL(2, R) Wess–Zumino–Witten models , which are relevant for the investigation of the moduli space of NS5/F1 brane configurations. Particular emphasis is given to the asymmetric deformations, triggered by electric or magnetic fluxes. These exhibit critical values, where the target spaces become exact geometric cosets such as S 2 ≡ SU(2)/U(1) or Ad...
متن کاملAlgebraic and Geometric Isomonodromic Deformations
Using the Gauss-Manin connection (Picard-Fuchs differential equation) and a result of Malgrange, a special class of algebraic solutions to isomonodromic deformation equations, the geometric isomonodromic deformations, is defined from “families of families” of algebraic varieties. Geometric isomonodromic deformations arise naturally from combinatorial strata in the moduli spaces of elliptic surf...
متن کاملModeling geometric deformations in EPI time series.
Even after realignment there is residual movement-related variance present in fMRI time-series, causing loss of sensitivity and, potentially, also specificity. One cause is the differential deformation of the sampling matrix, by field inhomogeneities, at different object positions, i.e., a movement-by-inhomogeneity interaction. This has been addressed previously by using empirical field measure...
متن کاملRandom Spatial Structure of Geometric Deformations
The main goal of computational anatomy is to compare shapes of organs (e.g. brain, heart and spine) observed from computed tomography (CT) and magnetic resonance (MR) imaging. Statistical analysis of shape differences can be useful to understand disease-related changes of anatomical structures. The key idea is to estimate transformations between a template and patient anatomies. These transform...
متن کاملCosets and genericity
In a connected group of finite Morley rank in which the generic element belongs to a connected nilpotent subgroup, proper normalizing cosets of definable subgroups are not generous. We explain why this is true and what consequences this has on an abstract theory of Weyl groups in groups of finite Morley rank. The only known infinite simple groups of finite Morley rank are the simple algebraic g...
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ژورنال
عنوان ژورنال: Fortschritte der Physik
سال: 2005
ISSN: 0015-8208,1521-3978
DOI: 10.1002/prop.200410224