SELECTED PAPERS of J. M. BURGERS Selected Papers of J

Total Page:16

File Type:pdf, Size:1020Kb

SELECTED PAPERS of J. M. BURGERS Selected Papers of J SELECTED PAPERS OF J. M. BURGERS Selected Papers of J. M. Burgers Edited by F. T. M. Nieuwstadt Department of Mechanical Engineering and Maritime Technology, Delft University of Technology, The Netherlands and J. A. Steketee Department of Aero and Space Engineering, Delft University of Technology, The Netherlands SPRINGER SCIENCE+BUSINESS MEDIA, B.V. A CLP. Catalogue record for this book is available from the Library of Congress. ISBN 978-94-010-4088-4 ISBN 978-94-011-0195-0 (eBook) DOI 10.1007/978-94-011-0195-0 Printed on acid-free paper All Rights Reserved © 1995 Springer Science+Business Media Dordrecht Originally published by Kluwer Academic Publishers in 1995 Softcover reprint of the hardcover 1st edition 1995 No part of the material protected by this copyright notice may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording or by any information storage and retrieval system, without written permission from the copyright owner. Preface By the beginning of this century, the vital role of fluid mechanics in engineering science and technological progress was clearly recognised. In 1918, following an international trend, the University of Technology in Delft established a chair in fluid dynamics, and we can still admire the wisdom of the committee which appointed the young theoretical physicist, J.M. Burgers, at the age of 23, to this position within the department of Mechanical Engineering, Naval architecture and Electrical Engineering. The consequences of this appointment were to be far-reaching. J .M. Burgers went on to become one of the leading figures in the field of fluid mechanics: a giant on whose shoulders the Dutch fluid mechanics community still stands. It is therefore scarcely surprising that the recently established Dutch research school on fluid mechanics should bear the name" J .M. Burgers Centre" . The work of J.M. Burgers has been influential in many areas of fluid me­ chanics and his papers are still frequently quoted, usually in the context of an equation or result to which his name became attached. Up to 1955 when he left for the USA to build a new scientific career, J.M. Burgers published most of his scientific work in the Proceedings and Transac­ tions of the Royal Netherlands Academy of Sciences, of which he was a dis­ tinguished member. Sadly, these publications are difficult to obtain through the usual library channels, and as a result the work of J.M. Burgers has been frequently misquoted or, worse still, reference to it omitted. Against this background and to celebrate the centenary of his birth, the editors decided to select and reissue those of his papers considered to contain his most important work up to 1955. It is hoped that in this way his work, and in particular the papers with the results that still bear his name, will be­ come accessible to a wider audience. This selection and the bibliography of all publications to which the name of J .M. Burgers is attached will give the reader an insight into the breadth and depth of J.M. Burgers' work. The editors will be happy to answer any queries or to provide information about any of these publications. Apart from being a brilliant scientist J.M. Burgers' interest and involvement in other areas of human endeavour are revealed in the impressive and lively v VI J.M. Burgers correspondence he conducted with specialists in many fields. Evidence of this is contained in the biography published in this book. Fortunately, J.M. Burgers was well-organised and kept copies of all letters. Both in Maryland, his second scientific home, and in Delft these letters have been archived and they make fascinating reading for all interested in the man J.M. Burgers, and in the era in which he lived. We are very happy to be able to publish this tribute to the great scientist, J.M. Burgers, to mark the centenary of his birth on 13 January 1895, and are grateful to for the stimulation and encouragement by many colleagues to undertake the editing of this book. In particular we are indebted to the Royal Netherlands Academy of Sciences for its permission to reprint the work of J.M. Burgers. Further, for the generous contributions which have made publication of this book possible, the editors wish to express appreciation to the following companies and institutes: Akzo Nobel, J.M. Burgers Centre, Fokker, Gasunie, Hoogovens Groep BV, Hydraulics Laboratory, National Institute for Coastal and Marine Management/RIKZ, NLR, Philips, Shell Nederland B.V., Stork Ketels, TNO-M&E, TNO-PML, TNO-TPD, Unilever and the Pieter Zeeman Fonds. The editors F.T.M. Nieuwstadt J.A Steketee Delft, October 12, 1994 Table of Contents Biography xi A Youth in Arnhem xii B Study in Leiden xiii C Thesis in Haarlem xvi D Appointment in Delft xviii E Professor in Delft xx E.1 Laboratories and Staff xxi E.2 Teaching and Students xxiv E.3 Experimental Work xxvii E.4 Theoretical Work xxx E.4.1 Resistance in Flows xxxii E.4.2 Turbulence xxxiv E.4.3 Rheology xxxix E.4.4 Suspensions xli E.4.5 Compressible Aerodynamics and Gas Dynamics xli E.5 'Applied' Work xlii E.5.1 Aeronautics xliv E.5.2 Hydraulics xliv E.5.3 Ventilation xlv E.5.4 Windmills xlvi F Connections around the World xlviii F.1 Conferences and Correspondence around the World I F.2 Communism and Russia liv G Concerns about Society and Career lviii G.1 Society lviii G.2 Career lxii vii viii J.M. Burgers H A New Life in the New World lxv H.l JMB and the USA lxvi H.2 Professor in Maryland lxviii I A Passionate Man lxxi I.1 A Broad Mind lxxi 1.2 A Peculiar Character lxxv 1.3 An Incomprehended Philosopher lxxvii 1.3.1 Science lxxvii 1.3.2 Life lxxx J JMB in Present-day Science lxxxiii J.l The Burgers Equation lxxxiii J.2 The Burgers Vector lxxxv J.3 The Burgers Element or Body lxxxv J.4 The Burgers Vortex lxxxv Acknowledgements lxxxvi Bibliography xciii Selected Papers 1 "On the resistance experienced by a fluid in turbulent motion" 2 "Preliminary measurements of the distribution of the velocity of a fluid in the immediate neighbourhood of a plane, smooth surface" 25 "On Oseen's theory for the approximate determination of the flow of a fluid with very small friction along a body" 57 "On the application of Oseen's hydro dynamical equations to the problem of the slipstream from an ideal propeller" 78 "On the application of statistical mechanics to the theory of turbulent fluid motion. I, II, III" 91 " On the application of Oseen's theory to the determination of the friction experienced by an infinitely thin flat plate" 134 "On the application of statistical mechanics to the theory of turbulent fluid motion. IV, V, VI, VII" 143 "Introductory remarks on recent investigations concerning the structure of liquids" 181 "On the motion of small particles of elongated form, suspended in a viscous liquid" 209 Selected Papers ix "Mathematical examples illustrating relations occurring in the theory of turbulent fluid motion" 281 "Some considerations on the fields of stress connected with dislocations in a regular crystal lattice. I, II" 335 "Application of a model system to illustrate some points of the statistical theory of free turbulence" 390 "On the application of viscosity data to the determination of the shape of protein molecules in solution" 401 "Some considerations on the development of boundary layers in the case of flows having a rotational component" 429 "On the distinction between irregular and systematic motion in diffusion problems" 442 "On the influence of the concentration of a suspension upon the sedimentation velocity (in particular for a suspension of spherical particles)" 452 "On the transmission of sound waves through a shock wave" 4 78 "Some problems of the motion of interstellar gas clouds. I, II" 487 " Aerodynamical problems suggested by a case of motion of interstellar gas clouds/Aerodynamical problems connected with the motion of a cloud of gas emitted by Nova Persei. I, II, III" 506 "Cases of motion in a gas with non colliding molecules" 533 "On the influence of gravity upon the expansion of a gas. I, II" 544 "Damped oscillations of a spherical mass of an elastic fluid" 562 "Note on the damping of the rotational oscillation of a spherical mass of an elastic fluid in consequence of slipping along the boundary" 572 "The formation of vortex sheets in a simplified type of turbulent motion" 579 "On homogeneous non-isotropic turbulence connected with a mean motion having a constant velocity gradient. I, II" 591 "Rotational motion of a sphere subject to visco-elastic deformation. I, II, III" 611 "On the problem of the postglacial uplift of Fennoscandia. I, II" 630 x J.M. Burgers Biography 1 At first sight the life of Jan Burgers (JMB) may seem rather uneventful, the life of a respected professor in his study. Partly, this is true, but once one has studied the huge amount of documents which JMB has left behind, the view shifts to that of a very intelligent, broad-minded, amiable (though perhaps somewhat eccentric and sometimes naive) person. The following sketch of the main events in his life, of his main scientific achievements, and of his thinking is meant to form proof for this assertion. It is based on various sources, though mainly on JMB's own writings: his rare autobiographical notes and published recollections, his unpublished notes, his papers, and his correspondence 2. Besides, several of the people who have known him have provided me with their written or spoken recollections.
Recommended publications
  • 1 WKB Wavefunctions for Simple Harmonics Masatsugu
    WKB wavefunctions for simple harmonics Masatsugu Sei Suzuki Department of Physics, SUNY at Binmghamton (Date: November 19, 2011) _________________________________________________________________________ Gregor Wentzel (February 17, 1898, in Düsseldorf, Germany – August 12, 1978, in Ascona, Switzerland) was a German physicist known for development of quantum mechanics. Wentzel, Hendrik Kramers, and Léon Brillouin developed the Wentzel– Kramers–Brillouin approximation in 1926. In his early years, he contributed to X-ray spectroscopy, but then broadened out to make contributions to quantum mechanics, quantum electrodynamics, and meson theory. http://en.wikipedia.org/wiki/Gregor_Wentzel _________________________________________________________________________ Hendrik Anthony "Hans" Kramers (Rotterdam, February 2, 1894 – Oegstgeest, April 24, 1952) was a Dutch physicist. http://en.wikipedia.org/wiki/Hendrik_Anthony_Kramers _________________________________________________________________________ Léon Nicolas Brillouin (August 7, 1889 – October 4, 1969) was a French physicist. He made contributions to quantum mechanics, radio wave propagation in the atmosphere, solid state physics, and information theory. http://en.wikipedia.org/wiki/L%C3%A9on_Brillouin _______________________________________________________________________ 1. Determination of wave functions using the WKB Approximation 1 In order to determine the eave function of the simple harmonics, we use the connection formula of the WKB approximation. V x E III II I x b O a The potential energy is expressed by 1 V (x) m 2 x 2 . 2 0 The x-coordinates a and b (the classical turning points) are obtained as 2 2 a 2 , b 2 , m0 m0 from the equation 1 V (x) m 2 x2 , 2 0 or 1 1 m 2a 2 m 2b2 , 2 0 2 0 where is the constant total energy. Here we apply the connection formula (I, upward) at x = a.
    [Show full text]
  • Download Chapter 90KB
    Memorial Tributes: Volume 12 Copyright National Academy of Sciences. All rights reserved. Memorial Tributes: Volume 12 H E N D R I C K K R A M E R S 1917–2006 Elected in 1978 “For leadership in Dutch industry, education, and professional societies and research on chemical reactor design, separation processes, and process control.” BY R. BYRON BIRD AND BOUDEWIJN VAN NEDERVEEN HENDRIK KRAMERS (usually called Hans), formerly a member of the Governing Board of Koninklijke Zout Organon, later Akzo, and presently Akzo Nobel, passed away on September 17, 2006, at the age of 89. He became a foreign associate of the National Academy of Engineering in 1980. Hans was born on January 16, 1917, in Constantinople, Turkey, the son of a celebrated scholar of Islamic studies at the Univer- sity of Leiden (Prof. J.H. Kramers, 1891-1951) and nephew of the famous theoretical physicist at the same university (Prof. H.A. Kramers). He pursued the science preparatory curriculum at a Gymnasium (high-level high school) in Leiden from 1928 to 1934. Then, from 1934 to 1941, he was a student in engineering physics at the Technische Hogeschool in Delft (Netherlands), where he got his engineer’s degree (roughly equivalent to or slightly higher than an M.S. in the United States). From 1941 to 1944, Hans was employed as a research physi- cist in the Engineering Physics Section at TNO (Organization for Applied Scientific Research) associated with the Tech- nische Hogeschool in Delft. From 1944 to 1948, he worked at the Bataafsche Petroleum Maatschappij (BPM) (Royal Dutch Shell) in Amsterdam.
    [Show full text]
  • Rethinking Antiparticles. Hermann Weyl's Contribution to Neutrino Physics
    Studies in History and Philosophy of Modern Physics 61 (2018) 68e79 Contents lists available at ScienceDirect Studies in History and Philosophy of Modern Physics journal homepage: www.elsevier.com/locate/shpsb Rethinking antiparticles. Hermann Weyl’s contribution to neutrino physics Silvia De Bianchi Department of Philosophy, Building B - Campus UAB, Universitat Autonoma de Barcelona 08193, Bellaterra Barcelona, Spain article info abstract Article history: This paper focuses on Hermann Weyl’s two-component theory and frames it within the early devel- Received 18 February 2016 opment of different theories of spinors and the history of the discovery of parity violation in weak in- Received in revised form teractions. In order to show the implications of Weyl’s theory, the paper discusses the case study of Ettore 29 March 2017 Majorana’s symmetric theory of electron and positron (1937), as well as its role in inspiring Case’s Accepted 31 March 2017 formulation of parity violation for massive neutrinos in 1957. In doing so, this paper clarifies the rele- Available online 9 May 2017 vance of Weyl’s and Majorana’s theories for the foundations of neutrino physics and emphasizes which conceptual aspects of Weyl’s approach led to Lee’s and Yang’s works on neutrino physics and to the Keywords: “ ” Weyl solution of the theta-tau puzzle in 1957. This contribution thus sheds a light on the alleged re-discovery ’ ’ Majorana of Weyl s and Majorana s theories in 1957, by showing that this did not happen all of a sudden. On the two-component theory contrary, the scientific community was well versed in applying these theories in the 1950s on the ground neutrino physics of previous studies that involved important actors in both Europe and United States.
    [Show full text]
  • De Tweede Gouden Eeuw
    De tweede Gouden Eeuw Nederland en de Nobelprijzen voor natuurwetenschappen 1870-1940 Bastiaan Willink bron Bastiaan Willink, De tweede Gouden Eeuw. Bert Bakker, Amsterdam 1998 Zie voor verantwoording: http://www.dbnl.org/tekst/will078twee01_01/colofon.php © 2007 dbnl / Bastiaan Willink 9 Dankwoord In juni 1996 wandelde ik over de begraafplaats van Montparnasse in Parijs, op zoek naar het graf van Henri Poincaré. Na enige omzwervingen vond ik het, verscholen achter graven van onbekenden, tegen de grote muur. Opluchting over de vondst mengde zich met verontwaardiging. Dit is geen passende plaats voor de grootste Franse wiskundige van de Belle Epoque. Hij hoort in het Pantheon! Meteen zag ik in dat zo'n reactie bij een Nederlander geen pas geeft. In ons land is er geen erebegraafplaats voor personen die grote prestaties leverden. Het is al een wonder, gelukkig minder zeldzaam dan vroeger, als er een biografie verschijnt van een Nederlandse wetenschappelijke coryfee. Dat motiveerde me om het plan voor dit boek definitief door te zetten. Het zou geen biografie worden, maar een mini-Pantheon van de Nederlandse wetenschap rond 1900. Er zijn eerder vergelijkbare boeken verschenen, maar een recent overzicht dat bovendien speciale aandacht schenkt aan oorzaken en gevolgen van bloei is er niet. Toen de tekst vorm begon te krijgen, sloeg de onzekerheid toe. Wie ben ik om al die verschillende specialisten te karakteriseren? Veel deskundige vrienden en vriendelijke deskundigen hebben me geholpen om de ergste omissies en fouten weg te werken. Ik ben de volgende hoog- en zeergeleerden erkentelijk voor literatuursuggesties en soms zeer indringend commentaar: A. Blaauw, H.B.G.
    [Show full text]
  • Statistical Mechanics of Branched Polymers Physical Virology ICTP Trieste, July 20, 2017
    Statistical Mechanics of Branched Polymers Physical Virology ICTP Trieste, July 20, 2017 Alexander Grosberg Center for Soft Matter Research Department of Physics, New York University My question to an anonymous referee: why do you think this is a perpetual motion machine? First part based on this image never published… From RNA to branched polymer Drawing by Joshua Kelly and Robijn Bruinsma To view RNA as a branched polymer is an imperfect approximation, with limited applicability … but let us explore it. Drawing by Angelo Rosa What is known about branched polymers? Classics 1: Main result: gyration radius 1/4 Rg ~ N Excluded volume becomes very important, because Bruno Zimm N/R 3~N1/4 grows with N Walter Stockmayer 1920-2005 g 1914-2004 “Chemical diameter” other people call it MLD Zimm-Stockmayer result: “typical” chemical diameter ~N1/2 Then its size in space is (N1/2)1/2=N1/4 Interesting: similar measures used to characterize dendritic arbors as well as vasculature in a human body or in a plant leave… Two ways to swell Always May or may not possible be possible Quenched Annealed Flory theory: old work and recent review Flory theory Highly Even less nontrivial trivial Quenched Annealed Kramers matrix comment Already a prediction J.Kelly developed algorithm to compute the right L Kramers theorem J.Kelly developed algorithm to compute the right L Quenched Qkm = ±K(k)M(m) 2 Trace(Qkm) = Rg (see Ben Shaul lecture yesterday) Maximal eigenvalue of Qkm gives the right L Hendrik (Hans) Kramers (1894-1952) Prediction works reasonably well Other predictions are also OK Green – single macromolecule in a good solvent; Magenta – single macromolecule in Q-solvent; Blue – one macromolecule among similar ones in a melt.
    [Show full text]
  • Quantization Conditions, 1900–1927
    Quantization Conditions, 1900–1927 Anthony Duncan and Michel Janssen March 9, 2020 1 Overview We trace the evolution of quantization conditions from Max Planck’s intro- duction of a new fundamental constant (h) in his treatment of blackbody radiation in 1900 to Werner Heisenberg’s interpretation of the commutation relations of modern quantum mechanics in terms of his uncertainty principle in 1927. In the most general sense, quantum conditions are relations between classical theory and quantum theory that enable us to construct a quantum theory from a classical theory. We can distinguish two stages in the use of such conditions. In the first stage, the idea was to take classical mechanics and modify it with an additional quantum structure. This was done by cut- ting up classical phase space. This idea first arose in the period 1900–1910 in the context of new theories for black-body radiation and specific heats that involved the statistics of large collections of simple harmonic oscillators. In this context, the structure added to classical phase space was used to select equiprobable states in phase space. With the arrival of Bohr’s model of the atom in 1913, the main focus in the development of quantum theory shifted from the statistics of large numbers of oscillators or modes of the electro- magnetic field to the detailed structure of individual atoms and molecules and the spectra they produce. In that context, the additional structure of phase space was used to select a discrete subset of classically possible motions. In the second stage, after the transition to modern quantum quan- tum mechanics in 1925–1926, quantum theory was completely divorced from its classical substratum and quantum conditions became a means of con- trolling the symbolic translation of classical relations into relations between quantum-theoretical quantities, represented by matrices or operators and no longer referring to orbits in classical phase space.1 More specifically, the development we trace in this essay can be summa- rized as follows.
    [Show full text]
  • Levensbericht N.G. Van Kampen
    Nicolaas Godfried van Kampen 22 juni 1921 – 6 oktober 2013 levensberichten en herdenkingen 2014 22 L&H_2014.indd 22 10/22/2014 3:20:10 PM Levensbericht door G. ’t Hooft Na een kort ziekbed, overleed op 6 oktober 2013 Nicolaas Godfried van Kampen, lid van de Koninklijke Nederlandse Akademie van Wetenschappen sinds 1973. Nico was 92 jaar, en tot nog onlangs bleef hij een trouw bezoeker van de vergaderingen van de Afdeling Natuurkunde, waar zijn aanwezigheid zelden onopgemerkt bleef. Nico’s vader, Pieter Nicolaas van Kampen, was hoogleraar zoölogie in Leiden en zijn moeder, Lize, was van de familie Zernike, die opmerkelijke personages telde, zoals haar broer, Frits Zernike, die in 1953 de Nobelprijs voor Natuurkunde kreeg toegekend voor de uitvinding van de fasecontrast- microscoop, een voor die tijd revolutionaire techniek die het mogelijk maakte om bijvoorbeeld het celdelingsproces in levende cellen waar te nemen. Een andere broer, Johannes Zernike, was hoogleraar in de scheikunde en schrijver van een boek over ‘Entropie’. Een zuster, Elisabeth Zernike, werd een bekend schrijfster, en een andere zuster, Nico’s tante Annie, werd de eerste Neder- landse vrouwelijke predikante, in Bovenknijpe. Zij huwde met de schilder Jan Mankes. Nico deed in 1939 eindexamen als beste van zijn klas in het gymnasium te Leiden. Hij was nog maar net begonnen met de natuurkundestudie in Leiden, toen de universiteit daar door de bezetters werd gesloten. Nico vertrok in 1941 naar Groningen waar zijn oom Frits Zernike hoogleraar theoretische natuurkunde was en waar hij in 1947 zijn doctoraal behaalde. Met Zernike werkte hij aan diffractie van licht.
    [Show full text]
  • Kramers Theory of Reaction Kinetics
    Kramers theory of reaction kinetics Winter School for Theoretical Chemistry and Spectroscopy Han-sur-Lesse, 7-11 December 2015 Hans Kramers Hendrik Anthony Kramers 1894 – 1952 1911 HBS, 1912 staatsexamen, 1916 doctoraal wis- en natuurkunde 1916 Arrived unannounced in Kopenhagen to do PhD with Niels Bohr 1919 promotion in Leiden (Ehrenfest), married in 1920 Lector in Kopenhagen 1926 Professor theoretical physics in Utrecht 1934 Professor in Leiden (chair of Ehrenfest), professor in TU-Delft Physics 7(4), April 1940, Pages 284-304 - 8 references Outline • Intro Kramers theory • Transition State Theory • The Langevin equation • The Fokker-Planck equation • Kramers reaction kinetics • high-friction vs low-friction limit • memory, Grote-Hynes theory • Bennet-Chandler approach • Reactive Flux • Transmission coefficient calculation • Free energy methods • Summary • Bibliography Molecular Transitions are Rare Events chemical reactions phase transitions protein folding defect diffusion self-assembly stock exchange crash Rare Events • Molecular transitions are not rare in every day life • They are only rare events with respect to the femto- second timescale of atomic motions • Modeling activated transitions by straightforward simulation would be extremely costly (takes forever) • Advanced methods: Transition state theory (TST), Bennet-Chandler (Reactive Flux) approach, Transition Path Sampling (TPS), Free energy methods, Parallel Tempering, String Method,.... A very long trajectory • A and B are (meta-)stable states, i.e. A B attractive basins • transitions between A and B are rare • transitions can happen fast • system looses memory in A and B Free energy landscape Rare Events Transition State The free energy has local minima separated by barriers Many possible transition paths via meta-stable states Projection on reaction coordinate shows FE profile P.G.
    [Show full text]
  • On the Verge of Umdeutung in Minnesota: Van Vleck and the Correspondence Principle. Part One. ?
    On the verge of Umdeutung in Minnesota: Van Vleck and the correspondence principle. Part One. ? Anthony Duncan a, Michel Janssen b,∗ aDepartment of Physics and Astronomy, University of Pittsburgh bProgram in the History of Science, Technology, and Medicine, University of Minnesota Abstract In October 1924, The Physical Review, a relatively minor journal at the time, pub- lished a remarkable two-part paper by John H. Van Vleck, working in virtual iso- lation at the University of Minnesota. Using Bohr’s correspondence principle and Einstein’s quantum theory of radiation along with advanced techniques from classi- cal mechanics, Van Vleck showed that quantum formulae for emission, absorption, and dispersion of radiation merge with their classical counterparts in the limit of high quantum numbers. For modern readers Van Vleck’s paper is much easier to follow than the famous paper by Kramers and Heisenberg on dispersion theory, which covers similar terrain and is widely credited to have led directly to Heisen- berg’s Umdeutung paper. This makes Van Vleck’s paper extremely valuable for the reconstruction of the genesis of matrix mechanics. It also makes it tempting to ask why Van Vleck did not take the next step and develop matrix mechanics himself. Key words: Dispersion theory, John H. Van Vleck, Correspondence Principle, Bohr-Kramers-Slater (BKS) theory, Virtual oscillators, Matrix mechanics ? This paper was written as part of a joint project in the history of quantum physics of the Max Planck Institut f¨ur Wissenschaftsgeschichte and the Fritz-Haber-Institut in Berlin. ∗ Corresponding author. Address: Tate Laboratory of Physics, 116 Church St.
    [Show full text]
  • Physics Celebrity #24 (Neil's Bohr)
    Niels Bohr (Danish) 1885 – 1962) made foundational contributions to understanding atomic structure and quantum mechanics, for which he received Neils Bohr (1885 - 1962) the Nobel Prize in Physics in 1922. Bohr was also a philosopher and a promoter of scientific research. He developed the Bohr model of the atom with the atomic nucleus at the centre and electrons in orbit around it, which he compared to the planets orbiting the Sun. He helped develop quantum mechanics, in which electrons move from one energy level to another in discrete steps, instead of continuously. He founded the Institute of Theoretical Physics at the University of Copenhagen, now known as the Niels Bohr Institute, which opened in 1920. Bohr mentored and collaborated with physicists including Hans Kramers, Oskar Klein, George de Hevesy and Werner Heisenberg. He predicted the existence of a new zirconium-like element, which was named hafnium, after Copenhagen, when it was discovered. Later, the element bohrium was named after him. He conceived the principle of complementarity: that items could be separately analysed as having contradictory properties, like behaving as a wave or a stream of particles. The notion of complementarity dominated his thinking on both science and philosophy. During the 1930s, Bohr gave refugees from Nazism temporary jobs at the Institute, provided them with financial support, arranged for them to be awarded fellowships from the Rockefeller Foundation, and ultimately found them places at various institutions around the world. After Denmark was occupied by the Germans, he had a dramatic meeting in Copenhagen with Heisenberg, who had become the head of the German nuclear energy project.
    [Show full text]
  • Download Introduction to Renormalization Group Methods In
    INTRODUCTION TO RENORMALIZATION GROUP METHODS IN PHYSICS: SECOND EDITION DOWNLOAD FREE BOOK R. J. Creswick | 432 pages | 15 Aug 2018 | Dover Publications Inc. | 9780486793450 | English | New York, United States Quantum Field Theory - Franz Mandl · Graham Shaw - 2nd edition Bibcode : PhRvD. After canceling out these terms with the contributions from cutoff-dependent counterterms, the cutoff is taken to infinity and finite physical results recovered. A pedagogical explanation of this technique is showed in reference [26]. And despite the comparative success of renormalisation theory, the feeling remains that there ought to be a more satisfactory way of doing things. A term in this Lagrangian, for example, the electron-photon interaction pictured in Figure 1, can then be written. This early work was the inspiration for later attempts at regularization and renormalization in quantum field theory. In order to regularize these integrals one needs a regulator, for the case of multi-loop integrals, these regulator can be taken as. When developing quantum electrodynamics in the s, Max BornWerner HeisenbergPascual Jordanand Paul Dirac discovered that in perturbative corrections many integrals were divergent see The problem of infinities. Of course, the best idea is to iterate until there is only one very big block. In contrast to the ultraviolet divergence, the infrared divergence does not require the renormalization of a parameter in the Introduction to Renormalization Group Methods in Physics: Second Edition involved. Note that Introduction to Renormalization Group Methods in Physics: Second Edition uses "bare actions" whereas the other uses effective average actions. So, the effective average action interpolates between the "bare action" and the effective action.
    [Show full text]
  • Exploring Higher Dimensional Quantum Field Theories Through Fixed Points
    Exploring Higher Dimensional Quantum Field Theories Through Fixed Points by Miss Rebecca M. Simms Thesis submitted in accordance with the requirements of the University of Liverpool for the degree of Doctor of Philosophy Theoretical Physics Division Department of Mathematical Sciences University of Liverpool United Kingdom August 2018 Exploring Higher Dimensional Quantum Field Theories Through Fixed Points by Miss Rebecca M. Simms Abstract Renormalization was popularised in the 1940s following the appearance of non- sensical infinities in the calculation of the self-energy of the electron. Notably this led to Quantum Electrodynamics becoming a fully renormalizable quantum field theory. One useful tool that emerges from the technical aspects of renormal- ization is the Renormalization Group. In particular, the β-function defines the variation of the coupling constants with energy. The vanishing of the β-function at a particular value of the coupling is known as a fixed point, the location of which can be found using perturbation theory. Properties of quantum field the- ories such as ultraviolet behaviour can be studied using these fixed points. The calculation of two different types of fixed points forms the spine of this thesis. In Part I the d-dimensional Wilson-Fisher fixed point is used to connect scalar quantum field theories in different space-time dimensions. Specifically we look at dimensions greater than four and explore the property of universality through the Vasil'ev large N expansion. Different universality classes are examined, the first contains φ4 theory with O(N) symmetry while another incorporates O(N) O(m) × Landau-Ginzburg-Wilson theory. In the latter we perform a full fixed point sta- bility analysis and conformal window search which determines where conformal symmetry is present.
    [Show full text]