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Search Results: 1 - 10 of 756 matches for " Reiner Ullrich "
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The role of Frolov's cubature formula for functions with bounded mixed derivative
Mario Ullrich,Tino Ullrich
Mathematics , 2015,
Abstract: We prove upper bounds on the order of convergence of Frolov's cubature formula for numerical integration in function spaces of dominating mixed smoothness on the unit cube with homogeneous boundary condition. More precisely, we study worst-case integration errors for Besov $\mathbf{B}^s_{p,\theta}$ and Triebel-Lizorkin spaces $\mathbf{F}^s_{p,\theta}$ and our results treat the whole range of admissible parameters $(s>1/p)$. In particular, we treat the case of small smoothness which is given for Triebel-Lizorkin spaces $\mathbf{F}^s_{p,\theta}$ in case $1<\theta1/\theta$. In the latter case the presented upper bounds are optimal, i.e., they can not be improved by any other cubature formula. The optimality for "small" smoothness is open. Moreover, we present a modification of the algorithm which lead to the same bounds (including small smoothness) also for the spaces of periodic functions.
Continuous Characterizations of Besov-Lizorkin-Triebel Spaces and New Interpretations as Coorbits
Tino Ullrich
Journal of Function Spaces and Applications , 2012, DOI: 10.1155/2012/163213
Abstract: We give characterizations for homogeneous and inhomogeneous Besov-Lizorkin-Triebel spaces (H. Triebel 1983, 1992, and 2006) in terms of continuous local means for the full range of parameters. In particular, we prove characterizations in terms of Lusin functions (tent spaces) and spaces involving the Peetre maximal function to apply the classical coorbit space theory according to Feichtinger and Gr?chenig (H. G Feichtinger and K. Gr?chenig 1988, 1989, and 1991). This results in atomic decompositions and wavelet bases for homogeneous spaces. In particular we give sufficient conditions for suitable wavelets in terms of moment, decay and smoothness conditions.
Zur Folter im deutschen Strafproze . Das Regelungsmodell von Benedict Carpzov (1595-1666)
Ullrich Falk
Forum Historiae Iuris , 2001,
Abstract:
Rekontextualisierte K rper Recontextualised bodies
Charlotte Ullrich
querelles-net , 2004,
Abstract: Die elf Aufs tze des von Ellen Kuhlmann und Regine Kollek herausgegebenen Sammelbandes Konfiguration des Menschen. Biowissenschaften als Arena der Geschlechterpolitik bieten eine gro e Bandbreite von Themenfeldern, theoretischen und disziplin ren Zug ngen zum Thema K rper“ in den Biowissenschaften. Auch aus geschlechterkritischer Perspektive werden biomedizinisches Wissen und Praktiken im Hinblick auf die (Re-)Konzeptionalisierung von K rpern untersucht. Edited by Ellen Kuhlmann and Regine Kollek, this collection of 11 essays, The Configuration of the Person: Biosciences as an Arena of Gender Politics, offers a diverse spectrum of themes and theoretical and interdisciplinary approaches to the topic of ‘bodies’ in the biosciences. Using a gender critical perspective, the essays examine bioscientific knowledge and practices with respect to the (re)conceptualisation of bodies.
The Emerging QCD Frontier: The Electron Ion Collider
Thomas Ullrich
Physics , 2008, DOI: 10.1088/0954-3899/35/10/104041
Abstract: The self-interactions of gluons determine all the unique features of QCD and lead to a dominant abundance of gluons inside matter already at moderate $x$. Despite their dominant role, the properties of gluons remain largely unexplored. Tantalizing hints of saturated gluon densities have been found in $e$+p collisions at HERA, and in d+Au and Au+Au collisions at RHIC. Saturation physics will have a profound influence on heavy-ion collisions at the LHC. But unveiling the collective behavior of dense assemblies of gluons under conditions where their self-interactions dominate will require an Electron-Ion Collider (EIC): a new facility with capabilities well beyond those In this paper I outline the compelling physics case for $e$+A collisions at an EIC and discuss briefly the status of machine design concepts. of any existing accelerator.
Exact and Perturbed Friedmann-Lemaitre Cosmologies
Paul Ullrich
Physics , 2007,
Abstract: In this thesis we first apply the 1+3 covariant description of general relativity to analyze n-fluid Friedmann-Lemaitre (FL) cosmologies; that is, homogeneous and isotropic cosmologies whose matter-energy content consists of n non-interacting fluids. We are motivated to study FL models of this type as observations suggest the physical universe is closely described by a FL model with a matter content consisting of radiation, dust and a cosmological constant. Secondly, we use the 1+3 covariant description to analyse scalar, vector and tensor perturbations of FL cosmologies containing a perfect fluid and a cosmological constant. In particular, we provide a thorough discussion of the behaviour of perturbations in the physically interesting cases of a dust or radiation background.
Uniqueness in the Characteristic Cauchy Problem of the Klein-Gordon Equation and Tame Restrictions of Generalized Functions
Peter Ullrich
Physics , 2004,
Abstract: We show that every tempered distribution, which is a solution of the (homogenous) Klein-Gordon equation, admits a ``tame'' restriction to the characteristic (hyper)surface $\{x^0+x^n=0\}$ in $(1+n)$-dimensional Minkowski space and is uniquely determined by this restriction. The restriction belongs to the space $\cS'_{\partial_-}(\R^n)$ which we have introduced in \cite{PullJMP}. Moreover, we show that every element of $\cS'_{\partial_-}(\R^n)$ appears as the ``tame'' restriction of a solution of the (homogeneous) Klein-Gordon equation.
Continuous characterizations of Besov-Lizorkin-Triebel spaces and new interpretations as coorbits
Tino Ullrich
Mathematics , 2010,
Abstract: We give characterizations for homogeneous and inhomogeneous Besov-Lizorkin-Triebel spaces in terms of continuous local means for the full range of parameters. In particular, we prove characterizations in terms of Lusin functions and spaces involving the Peetre maximal function to apply the classical coorbit space theory due to Feichtinger and Gr\"ochenig. This results in atomic decompositions and wavelet bases for homogeneous spaces. In particular we give sufficient conditions for suitable wavelets in terms of moment, decay and smoothness conditions.
Exact Sampling for the Ising Model at all Temperatures
Mario Ullrich
Mathematics , 2010, DOI: 10.1515/9783110293586.223
Abstract: We give a survey of the known results on mixing time of Glauber dynamics for the Ising model on the square lattice and present a technique that makes exact sampling of the Ising model at all temperatures possible in polynomial time. At high temperatures this is well-known and although this seems to be known also in the low temperature case since Kramer and Waniers paper from the 1950s, we did not found any reference that describes exact sampling for the Ising model at low temperatures.
Rapid mixing of Swendsen-Wang dynamics in two dimensions
Mario Ullrich
Mathematics , 2012, DOI: 10.4064/dm502-0-1
Abstract: We prove comparison results for the Swendsen-Wang (SW) dynamics, the heat-bath (HB) dynamics for the Potts model and the single-bond (SB) dynamics for the random-cluster model on arbitrary graphs. In particular, we prove that rapid mixing of HB implies rapid mixing of SW on graphs with bounded maximum degree and that rapid mixing of SW and rapid mixing of SB are equivalent. Additionally, the spectral gap of SW and SB on planar graphs is bounded from above and from below by the spectral gap of these dynamics on the corresponding dual graph with suitably changed temperature. As a consequence we obtain rapid mixing of the Swendsen-Wang dynamics for the Potts model on the two-dimensional square lattice at all non-critical temperatures as well as rapid mixing for the two-dimensional Ising model at all temperatures. Furthermore, we obtain new results for general graphs at high or low enough temperatures.
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