Is Spacetime Fractal and Quantum Coherent in the Golden Mean?
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Claus Kahlert and Otto E. Rössler Institute for Physical and Theoretical Chemistry, University of Tübingen Z. Naturforsch
Chaos as a Limit in a Boundary Value Problem Claus Kahlert and Otto E. Rössler Institute for Physical and Theoretical Chemistry, University of Tübingen Z. Naturforsch. 39a, 1200- 1203 (1984); received November 8, 1984 A piecewise-linear. 3-variable autonomous O.D.E. of C° type, known to describe constant- shape travelling waves in one-dimensional reaction-diffusion media of Rinzel-Keller type, is numerically shown to possess a chaotic attractor in state space. An analytical method proving the possibility of chaos is outlined and a set of parameters yielding Shil'nikov chaos indicated. A symbolic dynamics technique can be used to show how the limiting chaos dominates the behavior even of the finite boundary value problem. Reaction-diffusion equations occur in many dis boundary conditions are assumed. This result was ciplines [1, 2], Piecewise-linear systems are especially obtained by an analytical matching method. The amenable to analysis. A variant to the Rinzel-Keller connection to chaos theory (Smale [6] basic sets) equation of nerve conduction [3] can be written as was not evident at the time. In the following, even the possibility of manifest chaos will be demon 9 ö2 — u u + p [- u + r - ß + e (ii - Ö)], strated. o t oa~ In Fig. 1, a chaotic attractor of (2) is presented. Ö The flow can be classified as an example of "screw- — r = - e u + r , (1) 0/ type-chaos" (cf. [7]). A second example of a chaotic attractor is shown in Fig. 2. A 1-D projection of a where 0(a) =1 if a > 0 and zero otherwise; d is the 2-D cross section through the chaotic flow in a threshold parameter. -
D'arcy Wentworth Thompson
D’ARCY WENTWORTH THOMPSON Mathematically trained maverick zoologist D’Arcy Wentworth Thompson (May 2, 1860 –June 21, 1948) was among the first to cross the frontier between mathematics and the biological world and as such became the first true biomathematician. A polymath with unbounded energy, he saw mathematical patterns in everything – the mysterious spiral forms that appear in the curve of a seashell, the swirl of water boiling in a pan, the sweep of faraway nebulae, the thickness of stripes along a zebra’s flanks, the floret of a flower, etc. His premise was that “everything is the way it is because it got that way… the form of an object is a ‘diagram of forces’, in this sense, at least, that from it we can judge of or deduce the forces that are acting or have acted upon it.” He asserted that one must not merely study finished forms but also the forces that mold them. He sought to describe the mathematical origins of shapes and structures in the natural world, writing: “Cell and tissue, shell and bone, leaf and flower, are so many portions of matter and it is in obedience to the laws of physics that their particles have been moved, molded and conformed. There are no exceptions to the rule that God always geometrizes.” Thompson was born in Edinburgh, Scotland, the son of a Professor of Greek. At ten he entered Edinburgh Academy, winning prizes for Classics, Greek Testament, Mathematics and Modern Languages. At seventeen he went to the University of Edinburgh to study medicine, but two years later he won a scholarship to Trinity College, Cambridge, where he concentrated on zoology and natural science. -
Part II Topological Dualities
Part II Top ological dualities Chapter Top ology and armative predicates In the rst part of this monograph we considered predicates to be subsets of an abstract set of states If we think of the states as the denotations of results of computations of programs then predicates b ecome computationally mean ingful in the sense that we can use partial information ab out a computation to tell whether or not a predicate holds for that computation A predicate for which only nite information ab out a computation is needed to arm whether it holds is called an armative predicate The set of armative predicates is closed under nite intersections and ar bitrary unions Hence armative predicates can be identied with the op en sets of a top ological space The idea that op en sets are observable predi cates was prop osed by Smyth in although it is also brie y mentioned in Smyth interprets op en sets as semidecidable prop erties in some eectively given top ological space More generally op en sets can be inter preted as nitely observable predicates Alp ern and Schneider and Kwiatkowska use op en sets as nite liveness predicates and closed sets as safety predicates to formalize the informal characterization of liveness and safety prop erties of Lamp ort The name armative predicates has b een intro duced by Vickers for denoting the abstract op en sets of a frame Armative predicates are also called veriable predicates by Rewitzky who uses the term observable for predicates which are b oth armative and refutative Bonsangue In this chapter we intro -
A Method of Constructing Phyllotaxically Arranged Modular Models by Partitioning the Interior of a Cylinder Or a Cone
A method of constructing phyllotaxically arranged modular models by partitioning the interior of a cylinder or a cone Cezary St¸epie´n Institute of Computer Science, Warsaw University of Technology, Poland [email protected] Abstract. The paper describes a method of partitioning a cylinder space into three-dimensional sub- spaces, congruent to each other, as well as partitioning a cone space into subspaces similar to each other. The way of partitioning is of such a nature that the intersection of any two subspaces is the empty set. Subspaces are arranged with regard to phyllotaxis. Phyllotaxis lets us distinguish privileged directions and observe parastichies trending these directions. The subspaces are created by sweeping a changing cross-section along a given path, which enables us to obtain not only simple shapes but also complicated ones. Having created these subspaces, we can put modules inside them, which do not need to be obligatorily congruent or similar. The method ensures that any module does not intersect another one. An example of plant model is given, consisting of modules phyllotaxically arranged inside a cylinder or a cone. Key words: computer graphics; modeling; modular model; phyllotaxis; cylinder partitioning; cone partitioning; genetic helix; parastichy. 1. Introduction Phyllotaxis is the manner of how leaves are arranged on a plant stem. The regularity of leaves arrangement, known for a long time, still absorbs the attention of researchers in the fields of botany, mathematics and computer graphics. Various methods have been used to describe phyllotaxis. A historical review of problems referring to phyllotaxis is given in [7]. Its connections with number sequences, e.g. -
Spatio-Temporal Domains: an Overview David Janin
Spatio-temporal domains: an overview David Janin To cite this version: David Janin. Spatio-temporal domains: an overview. 2018. hal-01634897v2 HAL Id: hal-01634897 https://hal.archives-ouvertes.fr/hal-01634897v2 Preprint submitted on 17 Jul 2018 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Spatio-temporal domains: an overview David Janin? UMR LaBRI, Bordeaux INP Université de Bordeaux [email protected] Abstract. We consider the possibility of defining a general mathemat- ical framework for the homogeneous modeling and analysis of hetero- geneous spatio-temporal computations as they occur more and more in modern computerized systems of systems. It appears that certain fibra- tions of posets into posets, called here spatio-temporal domains, eventu- ally provide a fully featured category that extends to space and time the category of cpos and continuous functions, aka Scott Domains, used in classical denotational semantics. 1 Introduction Research context. Program semantics is classically divided between two com- plementary approaches : denotational semantics and operational semantics. De- notational semantics generally refers to what the partial functions encoded by programs are : what is the relationship between (models of) their input val- ues (or input memory state) and their output values (or output memory state). -
On the Categorical Semantics of Elementary Linear Logic
Theory and Applications of Categories, Vol. 22, No. 10, 2009, pp. 269{301. ON THE CATEGORICAL SEMANTICS OF ELEMENTARY LINEAR LOGIC OLIVIER LAURENT Abstract. We introduce the notion of elementary Seely category as a notion of cate- gorical model of Elementary Linear Logic (ELL) inspired from Seely's de¯nition of models of Linear Logic (LL). In order to deal with additive connectives in ELL, we use the ap- proach of Danos and Joinet [DJ03]. From the categorical point of view, this requires us to go outside the usual interpretation of connectives by functors. The ! connective is decomposed into a pre-connective ] which is interpreted by a whole family of functors (generated by id, and &). As an application, we prove the strati¯ed coherent model and the obsessional coherent model to be elementary Seely categories and thus models of ELL. Introduction The goal of implicit computational complexity is to give characterizations of complexity classes which rely neither on a particular computation model nor on explicit bounds. In linear logic (LL) [Gir87], the introduction of the exponential connectives gives a precise status to duplication and erasure of formulas (the qualitative analysis). It has been shown that putting constraints on the use of exponentials permits one to give a quantitative analysis of the cut elimination procedure of LL and to de¯ne light sub-systems of LL characterizing complexity classes (for example BLL [GSS92], LLL [Gir98] or SLL [Laf04] for polynomial time and ELL [Gir98, DJ03] for elementary time). In order to have a better understanding of the mathematical structures underlying these systems, various proposals have been made in the last years with the common goal of de¯ning denotational models of light systems [MO00, Bai04, DLH05, LTdF06, Red07]. -
Art and Engineering Inspired by Swarm Robotics
RICE UNIVERSITY Art and Engineering Inspired by Swarm Robotics by Yu Zhou A Thesis Submitted in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy Approved, Thesis Committee: Ronald Goldman, Chair Professor of Computer Science Joe Warren Professor of Computer Science Marcia O'Malley Professor of Mechanical Engineering Houston, Texas April, 2017 ABSTRACT Art and Engineering Inspired by Swarm Robotics by Yu Zhou Swarm robotics has the potential to combine the power of the hive with the sen- sibility of the individual to solve non-traditional problems in mechanical, industrial, and architectural engineering and to develop exquisite art beyond the ken of most contemporary painters, sculptors, and architects. The goal of this thesis is to apply swarm robotics to the sublime and the quotidian to achieve this synergy between art and engineering. The potential applications of collective behaviors, manipulation, and self-assembly are quite extensive. We will concentrate our research on three topics: fractals, stabil- ity analysis, and building an enhanced multi-robot simulator. Self-assembly of swarm robots into fractal shapes can be used both for artistic purposes (fractal sculptures) and in engineering applications (fractal antennas). Stability analysis studies whether distributed swarm algorithms are stable and robust either to sensing or to numerical errors, and tries to provide solutions to avoid unstable robot configurations. Our enhanced multi-robot simulator supports this research by providing real-time simula- tions with customized parameters, and can become as well a platform for educating a new generation of artists and engineers. The goal of this thesis is to use techniques inspired by swarm robotics to develop a computational framework accessible to and suitable for both artists and engineers. -
Morphology and Mathematics. by D'arcy Wentworth Thompson. The
( 857 ) XXVII.—Morphology and Mathematics. By D'Arcy Wentworth Thompson. (Read December 7, 1914. MS. received February 1, 1915. Issued separately June 22, 1915.) The study of Organic Form, which we call by GOETHE'S name of Morphology, is but a portion of that wider Science of Form which deals with the forms assumed by matter under all aspects and conditions, and, in a still wider sense, with Forms which are theoretically imaginable. The study of Form may be descriptive merely, or it may become analytical. We begin by describing the shape of an object in the simple words of common speech : we end by denning it in the precise language of mathematics ; and the one method tends to follow the other in strict scientific order and historical continuity. Thus, fer instance, the form of the earth, of a raindrop or a rainbow, the shape of the hanging chain, or the path of a stone thrown up into the air, may all be described, however inadequately, in common words ; but when we have learned to comprehend and to define the sphere, the catenary, or the parabola, we have made a wonderful and perhaps a manifold advance. The mathematical definition of a "form" has a quality of precision which was quite lacking in our earlier stage of mere description ; it is expressed in few words, or in still briefer symbols, and these words or symbols are so pregnant with meaning that thought itself is economised ; we are brought by means of it in touch with GALILEO'S aphorism, that " the Book of Nature is written in characters of Geometry." Next, we soon reach through mathematical analysis to mathematical synthesis ; we discover homologies or identities which were not obvious before, and which our descriptions obscured rather than revealed : as, for instance, when we learn that, however we hold our chain, or however we fire our bullet, the contour of the one or the path of the other is always mathematically homologous. -
Bolles E.B. Einstein Defiant.. Genius Versus Genius in the Quantum
Selected other titles by Edmund Blair Bolles The Ice Finders: How a Poet, a Professor, and a Politician Discovered the Ice Age A Second Way of Knowing: The Riddle of Human Perception Remembering and Forgetting: Inquiries into the Nature of Memory So Much to Say: How to Help Your Child Learn Galileo’s Commandment: An Anthology of Great Science Writing (editor) Edmund Blair Bolles Joseph Henry Press Washington, DC Joseph Henry Press • 500 Fifth Street, NW • Washington, DC 20001 The Joseph Henry Press, an imprint of the National Academies Press, was created with the goal of making books on science, technology, and health more widely available to professionals and the public. Joseph Henry was one of the founders of the National Academy of Sciences and a leader in early American science. Any opinions, findings, conclusions, or recommendations expressed in this volume are those of the author and do not necessarily reflect the views of the National Academy of Sciences or its affiliated institutions. Library of Congress Cataloging-in-Publication Data Bolles, Edmund Blair, 1942- Einstein defiant : genius versus genius in the quantum revolution / by Edmund Blair Bolles. p. cm. Includes bibliographical references. ISBN 0-309-08998-0 (hbk.) 1. Quantum theory—History—20th century. 2. Physics—Europe—History— 20th century. 3. Einstein, Albert, 1879-1955. 4. Bohr, Niels Henrik David, 1885-1962. I. Title. QC173.98.B65 2004 530.12′09—dc22 2003023735 Copyright 2004 by Edmund Blair Bolles. All rights reserved. Printed in the United States of America. To Kelso Walker and the rest of the crew, volunteers all. -
Compact Topologies on Locally Presentable Categories Cahiers De Topologie Et Géométrie Différentielle Catégoriques, Tome 38, No 3 (1997), P
CAHIERS DE TOPOLOGIE ET GÉOMÉTRIE DIFFÉRENTIELLE CATÉGORIQUES PANAGIS KARAZERIS Compact topologies on locally presentable categories Cahiers de topologie et géométrie différentielle catégoriques, tome 38, no 3 (1997), p. 227-255 <http://www.numdam.org/item?id=CTGDC_1997__38_3_227_0> © Andrée C. Ehresmann et les auteurs, 1997, tous droits réservés. L’accès aux archives de la revue « Cahiers de topologie et géométrie différentielle catégoriques » implique l’accord avec les conditions générales d’utilisation (http://www.numdam.org/conditions). Toute utilisation commerciale ou impression systématique est constitutive d’une infraction pénale. Toute copie ou impression de ce fichier doit contenir la présente mention de copyright. Article numérisé dans le cadre du programme Numérisation de documents anciens mathématiques http://www.numdam.org/ CAHIER DE TOPOLOGIE ET J Illume XXXVIII-3 (1997) GEOMETRIE DIFFERENTIELLE CATEGORIQUES COMPACT TOPOLOGIES ON LOCALLY PRESENTABLE CATEGORIES by Panagis KARAZERIS RESUME. Les topologies sur les categories localement pr6sentables g6n6rallsent les notions famill6res suivantes, d’une part les topologies de Grothendieck sur des petites categories, d’autre part les topologies de Gabriel sur des categories abéliennes à generateurs. Dans cet article on introduit une condition, qui peut être v6rifi6e pour les topologies pr6c6dentes, appel6e "compacit6". Dans le cas des topologies de Grothendieck, cette condition signifie qu’un recouvrement quelconque a un sous-recouvrement fini. Les topologies compactes correspondantes ont des localisations ferm6es dans la cat6gorie donnee pour des colimites filtrantes monomorphiques. On examine aussi la fermeture des objets s6par6s et des faisceaux pour les colimites filtrantes. Les topologies compactes sur une cat6gorie localement de presentation finie forment un locale. Si cette cat6gorie est un topos coherent, alors le locale est compact et localement compact. -
Chao-Dyn/9402001 7 Feb 94
chao-dyn/9402001 7 Feb 94 DESY ISSN Quantum Chaos January Einsteins Problem of The study of quantum chaos in complex systems constitutes a very fascinating and active branch of presentday physics chemistry and mathematics It is not wellknown however that this eld of research was initiated by a question rst p osed by Einstein during a talk delivered in Berlin on May concerning Quantum Chaos the relation b etween classical and quantum mechanics of strongly chaotic systems This seems historically almost imp ossible since quantum mechanics was not yet invented and the phenomenon of chaos was hardly acknowledged by physicists in While we are celebrating the seventyfth anniversary of our alma mater the Frank Steiner Hamburgische Universitat which was inaugurated on May it is interesting to have a lo ok up on the situation in physics in those days Most I I Institut f urTheoretische Physik UniversitatHamburg physicists will probably characterize that time as the age of the old quantum Lurup er Chaussee D Hamburg Germany theory which started with Planck in and was dominated then by Bohrs ingenious but paradoxical mo del of the atom and the BohrSommerfeld quanti zation rules for simple quantum systems Some will asso ciate those years with Einsteins greatest contribution the creation of general relativity culminating in the generally covariant form of the eld equations of gravitation which were found by Einstein in the year and indep endently by the mathematician Hilb ert at the same time In his talk in May Einstein studied the -
Introduction to Coherent Spaces
Introduction to coherent spaces Arnold Neumaier Fakult¨at f¨ur Mathematik, Universit¨at Wien Oskar-Morgenstern-Platz 1, A-1090 Wien, Austria email: [email protected] WWW: http://www.mat.univie.ac.at/~neum arXiv:1804.01402 September 28, 2018 Abstract. The notion of a coherent space is a nonlinear version of the notion of a complex Euclidean space: The vector space axioms are dropped while the notion of inner product is kept. Coherent spaces provide a setting for the study of geometry in a different direction than traditional metric, topological, and differential geometry. Just as it pays to study the properties of manifolds independently of their embedding into a Euclidean space, so it appears fruitful to study the properties of coherent spaces independent of their embedding into a Hilbert space. Coherent spaces have close relations to reproducing kernel Hilbert spaces, Fock spaces, and unitary group representations, and to many other fields of mathematics, statistics, and physics. This paper is the first of a series of papers and defines concepts and basic theorems about coherent spaces, associated vector spaces, and their topology. Later papers in the series dis- cuss symmetries of coherent spaces, relations to homogeneous spaces, the theory of group representations, C∗-algebras, hypergroups, finite geometry, and applications to quantum physics. While the applications to quantum physics were the main motiviation for develop- ing the theory, many more applications exist in complex analysis, group theory, probability theory, statistics, physics, and engineering. For the discussion of questions concerning coherent spaces, please use the discussion forum https://www.physicsoverflow.org.