The People Vs. String Theory
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Arthur S. Eddington the Nature of the Physical World
Arthur S. Eddington The Nature of the Physical World Arthur S. Eddington The Nature of the Physical World Gifford Lectures of 1927: An Annotated Edition Annotated and Introduced By H. G. Callaway Arthur S. Eddington, The Nature of the Physical World: Gifford Lectures of 1927: An Annotated Edition, by H. G. Callaway This book first published 2014 Cambridge Scholars Publishing 12 Back Chapman Street, Newcastle upon Tyne, NE6 2XX, UK British Library Cataloguing in Publication Data A catalogue record for this book is available from the British Library Copyright © 2014 by H. G. Callaway All rights for this book reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of the copyright owner. ISBN (10): 1-4438-6386-6, ISBN (13): 978-1-4438-6386-5 CONTENTS Note to the Text ............................................................................... vii Eddington’s Preface ......................................................................... ix A. S. Eddington, Physics and Philosophy .......................................xiii Eddington’s Introduction ................................................................... 1 Chapter I .......................................................................................... 11 The Downfall of Classical Physics Chapter II ......................................................................................... 31 Relativity Chapter III -
Einstein's Mistakes
Einstein’s Mistakes Einstein was the greatest genius of the Twentieth Century, but his discoveries were blighted with mistakes. The Human Failing of Genius. 1 PART 1 An evaluation of the man Here, Einstein grows up, his thinking evolves, and many quotations from him are listed. Albert Einstein (1879-1955) Einstein at 14 Einstein at 26 Einstein at 42 3 Albert Einstein (1879-1955) Einstein at age 61 (1940) 4 Albert Einstein (1879-1955) Born in Ulm, Swabian region of Southern Germany. From a Jewish merchant family. Had a sister Maja. Family rejected Jewish customs. Did not inherit any mathematical talent. Inherited stubbornness, Inherited a roguish sense of humor, An inclination to mysticism, And a habit of grüblen or protracted, agonizing “brooding” over whatever was on its mind. Leading to the thought experiment. 5 Portrait in 1947 – age 68, and his habit of agonizing brooding over whatever was on its mind. He was in Princeton, NJ, USA. 6 Einstein the mystic •“Everyone who is seriously involved in pursuit of science becomes convinced that a spirit is manifest in the laws of the universe, one that is vastly superior to that of man..” •“When I assess a theory, I ask myself, if I was God, would I have arranged the universe that way?” •His roguish sense of humor was always there. •When asked what will be his reactions to observational evidence against the bending of light predicted by his general theory of relativity, he said: •”Then I would feel sorry for the Good Lord. The theory is correct anyway.” 7 Einstein: Mathematics •More quotations from Einstein: •“How it is possible that mathematics, a product of human thought that is independent of experience, fits so excellently the objects of physical reality?” •Questions asked by many people and Einstein: •“Is God a mathematician?” •His conclusion: •“ The Lord is cunning, but not malicious.” 8 Einstein the Stubborn Mystic “What interests me is whether God had any choice in the creation of the world” Some broadcasters expunged the comment from the soundtrack because they thought it was blasphemous. -
The Development of the Science of Superconductivity and Superfluidity
Universal Journal of Physics and Application 1(4): 392-407, 2013 DOI: 10.13189/ujpa.2013.010405 http://www.hrpub.org Superconductivity and Superfluidity-Part I: The development of the science of superconductivity and superfluidity in the 20th century Boris V.Vasiliev ∗Corresponding Author: [email protected] Copyright ⃝c 2013 Horizon Research Publishing All rights reserved. Abstract Currently there is a common belief that the explanation of superconductivity phenomenon lies in understanding the mechanism of the formation of electron pairs. Paired electrons, however, cannot form a super- conducting condensate spontaneously. These paired electrons perform disorderly zero-point oscillations and there are no force of attraction in their ensemble. In order to create a unified ensemble of particles, the pairs must order their zero-point fluctuations so that an attraction between the particles appears. As a result of this ordering of zero-point oscillations in the electron gas, superconductivity arises. This model of condensation of zero-point oscillations creates the possibility of being able to obtain estimates for the critical parameters of elementary super- conductors, which are in satisfactory agreement with the measured data. On the another hand, the phenomenon of superfluidity in He-4 and He-3 can be similarly explained, due to the ordering of zero-point fluctuations. It is therefore established that both related phenomena are based on the same physical mechanism. Keywords superconductivity superfluidity zero-point oscillations 1 Introduction 1.1 Superconductivity and public Superconductivity is a beautiful and unique natural phenomenon that was discovered in the early 20th century. Its unique nature comes from the fact that superconductivity is the result of quantum laws that act on a macroscopic ensemble of particles as a whole. -
A Singing, Dancing Universe Jon Butterworth Enjoys a Celebration of Mathematics-Led Theoretical Physics
SPRING BOOKS COMMENT under physicist and Nobel laureate William to the intensely scrutinized narrative on the discovery “may turn out to be the greatest Henry Bragg, studying small mol ecules such double helix itself, he clarifies key issues. He development in the field of molecular genet- as tartaric acid. Moving to the University points out that the infamous conflict between ics in recent years”. And, on occasion, the of Leeds, UK, in 1928, Astbury probed the Wilkins and chemist Rosalind Franklin arose scope is too broad. The tragic figure of Nikolai structure of biological fibres such as hair. His from actions of John Randall, head of the Vavilov, the great Soviet plant geneticist of the colleague Florence Bell took the first X-ray biophysics unit at King’s College London. He early twentieth century who perished in the diffraction photographs of DNA, leading to implied to Franklin that she would take over Gulag, features prominently, but I am not sure the “pile of pennies” model (W. T. Astbury Wilkins’ work on DNA, yet gave Wilkins the how relevant his research is here. Yet pulling and F. O. Bell Nature 141, 747–748; 1938). impression she would be his assistant. Wilkins such figures into the limelight is partly what Her photos, plagued by technical limitations, conceded the DNA work to Franklin, and distinguishes Williams’s book from others. were fuzzy. But in 1951, Astbury’s lab pro- PhD student Raymond Gosling became her What of those others? Franklin Portugal duced a gem, by the rarely mentioned Elwyn assistant. It was Gosling who, under Franklin’s and Jack Cohen covered much the same Beighton. -
Aleksei A. Abrikosov 1928–2017
Aleksei A. Abrikosov 1928–2017 A Biographical Memoir by M. R. Norman ©2018 National Academy of Sciences. Any opinions expressed in this memoir are those of the author and do not necessarily reflect the views of the National Academy of Sciences. ALEKSEI ALEKSEEVICH ABRIKOSOV June 25, 1928–March 29, 2017 Elected to the NAS, 2000 Shortly after the 2003 announcement that Aleksei Abrikosov had won the Nobel Prize in Physics, a number of colleagues took Alex to lunch at a nearby Italian restau- rant. During lunch, one of the Russian visitors exclaimed that Alex should get a second Nobel Prize, this time in Literature for his famous “AGD” book with Lev Gor’kov and Igor Dzyaloshinskii (Methods of Quantum Field Theory in Statistical Physics.) Somewhat taken aback, I looked closely at this individual and realized that he was deadly serious. Although I could imagine the reaction of the Nobel Literature committee to such a book (for a lay person, perhaps analogous to trying to read Finnegan’s Wake), I had to admit that my own copy of this book is quite dog-eared, having been put to good use over the By M. R. Norman years. In fact, you know you have made it in physics when your book gets a Dover edition. One of the most charming pictures I ever saw was a rare drawing in color that Alexei Tsvelik did (commissioned by Andrei Varlamov for Alex’s 50th birthday) that was proudly displayed in Alex’s home in Lemont, IL. It showed Alex with his fingers raised in a curled fashion as in the habit of medieval Popes. -
Ontology in Quantum Mechanics
Ontology in quantum mechanics Gerard 't Hooft Faculty of Science, Institute for Theoretical Physics, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands e-mail: [email protected] internet: http://www.staff.science.uu.nl/˜hooft101/ Abstract It is suspected that the quantum evolution equations describing the micro-world as we know it are of a special kind that allows transformations to a special set of basis states in Hilbert space, such that, in this basis, the evolution is given by ele- ments of the permutation group. This would restore an ontological interpretation. It is shown how, at low energies per particle degree of freedom, almost any quantum system allows for such a transformation. This contradicts Bell's theorem, and we emphasise why some of the assumptions made by Bell to prove his theorem cannot hold for the models studied here. We speculate how an approach of this kind may become helpful in isolating the most likely version of the Standard Model, combined with General Relativity. A link is suggested with black hole physics. Keywords: foundations quantum mechanics, fast variables, cellular automaton, classical/quantum evolution laws, Stern-Gerlach experiment, Bell's theorem, free will, Standard Model, anti-vacuum state. arXiv:2107.14191v1 [quant-ph] 29 Jul 2021 1 1 Introduction Since its inception, during the first three decades of the 20th century, quantum mechanics was subject of intense discussions concerning its interpretation. Since experiments were plentiful, and accurate calculations could be performed to com- pare the experimental results with the theoretical calculations, scientists quickly agreed on how detailed quantum mechanical models could be arrived at, and how the calculations had to be done. -
CP Violation's Early Days
CERN Courier July/August 2014 Anniversary Temperature is our business CP violation’s early days Mineral Insulated Cable Reliable, Highly accurate cabling capable of A brief look back at a discovery that surprised operating in extreme environments. the world of particle physics 50 years ago. MgO and SiO2 Cables. RF Coaxial Cables. Multiconductor Transmission Cables. In the summer of 1964, at the International Conference on High- Welded and hermetically sealed connections. Energy Physics (ICHEP) in Dubna, Jim Cronin presented the results Capable of operating in and measuring temperatures of an experiment studying neutral kaons at Brookhaven National of up to 1,260oC. Laboratory. In particular, it had shown that the long-lived neutral Capable of operating in the following atmospheres - kaon can decay into two pions, which implied the violation of CP oxidising, reducing, neutral and vacuum. symmetry – a discovery that took the physics community by sur- prise. The news was greeted with some scepticism and met a barrage of questions. Everyone wanted to be satisfi ed that nothing had been overlooked, and that all other possibilities had been considered care- The experiment that discovered CP violation at Brookhaven was fully and ruled out. People need not have worried. Cronin, together set up in a neutral beamline, directed inside the ring of the Innovation at Okazaki: Cabling, Temperature Sensors & Heaters | okazaki-mfg.com with Val Fitch, visiting French physicist René Turlay and graduate Alternating Gradient Synchrotron. Visible here are the two student Jim Christenson, had spent months asking themselves the spectrometer magnets positioned at 22° to the beam. Spark CERN_125x193:Mise en page 1 18/09/12 17:17 Page 1 same questions, testing and cross-checking their results thoroughly. -
Complexity, Symmetry and Strong Correlations
Jak Chakhalian COMPLEXITY, SYMMETRY AND Solid State Physics 601 STRONG CORRELATIONS Fall 2017 Phenomena Emerging from Complexity APPROACH TO COMPLEX PHENOMENA reductionism and emergence 3 Exploring the Unit materials which deform under stress, like polymers, liquids, colloids, and granular materials. The written text for this unit focuses on solid state physics, whereas the video touches on both solid state and soft condensed matter. In today’s session, we will focus on emergence in condensed matter physics: both solid-state and soft condensed matter. By some accounts, all of condensed matter physics can be considered emergent. The simplest definition of emergence is the interaction of individual pieces, following simple rules, which leads to collective behavior. There is no leader, or top-down control in such systems—the collective behavior comes from the bottom-up interaction of many individuals. In flocking, for example, each bird is following simple rules: Stay close to your neighbors, but not too close, and avoid predators. From these rules comes surprisingly coherent behavior of the flock as a whole. (Note: In particular, non-linear interactions, in which the character of the interaction changes with some parameter, like distance, lead to surprising behavior. In this way, complex behavior is not simply the additive sum of many individual interactions.) WHAT IS EMERGENCE ? Here is a definition of emergence from the National Academies: 3 Emergent phenomena in condensed-matter and materials physics are those that cannot be understood with models that treat the motions of the individual particles within the material independently. Instead, the essence of emergent phenomena lies in the complex interactions between many particles that result in the diverse behavior and often unpredictable collective motion of many particles. -
The Conflicting Case of Lev Davidovich Landau's Cerebral Death
International Journal of Humanities Social Sciences and Education (IJHSSE) Volume 5, Issue 3, March 2018, PP 30-35 ISSN 2349-0373 (Print) & ISSN 2349-0381 (Online) http://dx.doi.org/10.20431/2349-0381.0503003 www.arcjournals.org The Conflicting Case of Lev Davidovich Landau's Cerebral Death Celso Luis Levada1, Huemerson Maceti2, Ivan José Lautenschleguer3, Miriam de Magalhães Oliveira Levada4 1, 2, 3, 4 Teaching Group of Sciences of Herminio Ometto Foundation - Uniararas /Brazil *Corresponding Author: Celso Luis Levada, Teaching Group of Sciences of Herminio Ometto Foundation - Uniararas /Brazil Abstract: On April 1, 2018, it will complete fifty years of the death of one of the scientists who contributed most to the development of physics in the 20th century, the Russian Lev Davidovich Landau. He was born on January 22, 1908 in Baku, Azerbaijan, in what was then the Russian Empire. He was a prominent soviet physicist who made fundamental contributions to many areas of theoretical physics. He received the 1962 Nobel Prize in Physics for his theory of super fluidity that accounts for the properties of liquid helium. On January, 1962, Landau was seriously injured in an automobile accident and remained three months in a coma, being declared clinically dead four times. Recovered, he lived another six years. Landau died on April, 1968, aged 60, from complications from the accident. The case involving Landau introduces a conflict related to the removal of organs from people believed to be brain dead. Keywords: Landau, Nobel Prize Physics, Brain Death. 1. INTRODUCTION Landau was born in Baku, Azerbaijan, on January 22, 1908, the son of an oil engineer and a doctor. -
Lev Davidovich Landau (1908=1968)
Lev Landau: a View from the West Pierre Hohenberg, New York University APS Meeting, March 18, 2009 1 Lev Davidovich Landau (1908 -1968) I. Introduction II. The main scientific achievements III. The Course in Theoretical Physics and the Landau school IV. The scientific legacy 2 3 Lev Davidovich Landau • 1908 Born in Baku, Azerbaijan • 1921-1927 University (Baku, Leningrad) • 1928- 1932 Leningrad (Physicotechnical Institute) • 1929-1931 Travels to Copenhagen, Zurich, Germany, UK • 1932-1937 Kharkov (Physicotechnical Institute, University) • 1937-1962 Moscow (Institute for Physical Problems) • 1938 Imprisoned for 12-13 months • 1962 Automobile accident (January) • 1968 Dies in Moscow 4 The Main Scientific Achievements Landau wrote a total of 100 papers. For his 50th birthday he was presented with tablets with the ‘Ten Commandments’, to signify his 10 greatest papers: 1. Density Matrix (1927) 2. Landau Diamagnetism (1930) 3. Dynamics of Ferromagnets (1935; with E M Lifshitz) 4. Theory of Phase Transitions (1937) 5. Intermediate State of Superconductors (1937) 6. Statistical Theory of Nuclei (1937) 7. Theory of Superfluidity (1941) 8. Renormalization of Electron Charge in QED (1954, with Abrikosov and Khalatnikov) 9. Theory of Fermi Liquid (1956) 10. Two-component neutrino (1957) 5 6 A few more papers 2a. Antiferromagnetism (1933) 2b. Polarons (1933) 2c. Rayleigh Scattering in Fluids (1934, with Placzek) 6a. Cascade Theory of Electron Showers (1938, with Rumer) 7a. Theory of Turbulence (1944) 7b. Damping of Plasma Waves (1946) 7c. Phenomenological Theory of Superconductivity (1950, with Ginzburg) 7d. Hydrodynamic Theory of Multiple Particle Production (1953) 10a. Analytic Properties of Vertex in Quantum Field Theory (1959) 10b. -
Confusions Regarding Quantum Mechanics Gerard ’T Hooft, Reply by Sheldon Lee Glashow
INFERENCE / Vol. 5, No. 3 Confusions Regarding Quantum Mechanics Gerard ’t Hooft, reply by Sheldon Lee Glashow In response to “The Yang–Mills Model” (Vol. 5, No. 2). began to argue about how the equation is supposed to be interpreted. Why is it that positions and velocities of par- ticles at one given moment cannot be calculated, or even To the editors: defined unambiguously? Physicists know very well how to use the equation. Quantum mechanics was one of the most significant and They use it to derive with perplexing accuracy the prop- important discoveries of twentieth-century science. It all erties of atoms, molecules, elementary particles, and the began, I think, in the year 1900 when Max Planck published forces between all of these. The way the equation is used his paper entitled “On the Theory of the Energy Distribu- is nothing to complain about, but what exactly does it say? tion Law of the Normal Spectrum.”1 In it, he describes a The first question one may rightfully ask, and that simple observation: if one attaches an entropy to the radi- has been asked by many researchers and their students, ation field as if its total energy came in packages—now is this: called quanta—then the intensity of the radiation associ- ated to a certain temperature agrees quite well with the What do these wave functions represent? In particular, what observations. Planck had described his hypothesis as “an is represented by the wave functions that are not associ- act of desperation.”2 But it was the only one that worked. -
How to Get a Nobel Prize in Physics
LANDAU’S NOBEL PRIZE IN PHYSICS Mats Larsson Department of Physics, Stockholm University Member of the Royal Swedish Academy of Sciences 2013 Member of the Nobel Committee for Physics OUTLINE Description of the Nobel Prize procedure Landau’s Nobel Prize (with some discussions about Pyotr Kapitsa) "The whole of my remaining realizable estate shall be dealt with in the following way: the capital, invested in safe securities by my executors, shall constitute a fund, the interest on which shall be annually distributed in the form of prizes to those who, during the preceding year, shall have conferred the greatest benefit on mankind. The said interest shall be divided into five equal parts, which shall be apportioned as follows: one part to the person who shall have made the most important discovery or invention within the field of physics; one part to the person who shall have made the most important chemical discovery or improvement; one part to the person who shall have made the most important discovery within the domain of physiology or medicine; one part to the person who shall have produced in the field of literature the most outstanding work in an ideal direction; and one part to the person who shall have done the most or the best work for fraternity between nations, for the abolition or reduction of standing armies and for the holding and promotion of peace congresses. The prizes for physics and chemistry shall be awarded by the Swedish Academy of Sciences; that for physiology or medical works by the Karolinska Institute in Stockholm; that for literature by the Academy in Stockholm, and that for champions of peace by a committee of five persons to be elected by the Norwegian Storting.