The International Centre for Theoretical Physics- Physics and the Developing Countries
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The Future of Fundamental Physics
The Future of Fundamental Physics Nima Arkani-Hamed Abstract: Fundamental physics began the twentieth century with the twin revolutions of relativity and quantum mechanics, and much of the second half of the century was devoted to the con- struction of a theoretical structure unifying these radical ideas. But this foundation has also led us to a number of paradoxes in our understanding of nature. Attempts to make sense of quantum mechanics and gravity at the smallest distance scales lead inexorably to the conclusion that space- Downloaded from http://direct.mit.edu/daed/article-pdf/141/3/53/1830482/daed_a_00161.pdf by guest on 23 September 2021 time is an approximate notion that must emerge from more primitive building blocks. Further- more, violent short-distance quantum fluctuations in the vacuum seem to make the existence of a macroscopic world wildly implausible, and yet we live comfortably in a huge universe. What, if anything, tames these fluctuations? Why is there a macroscopic universe? These are two of the central theoretical challenges of fundamental physics in the twenty-½rst century. In this essay, I describe the circle of ideas surrounding these questions, as well as some of the theoretical and experimental fronts on which they are being attacked. Ever since Newton realized that the same force of gravity pulling down on an apple is also responsible for keeping the moon orbiting the Earth, funda- mental physics has been driven by the program of uni½cation: the realization that seemingly disparate phenomena are in fact different aspects of the same underlying cause. By the mid-1800s, electricity and magnetism were seen as different aspects of elec- tromagnetism, and a seemingly unrelated phenom- enon–light–was understood to be the undulation of electric and magnetic ½elds. -
Quantum Field Theory*
Quantum Field Theory y Frank Wilczek Institute for Advanced Study, School of Natural Science, Olden Lane, Princeton, NJ 08540 I discuss the general principles underlying quantum eld theory, and attempt to identify its most profound consequences. The deep est of these consequences result from the in nite number of degrees of freedom invoked to implement lo cality.Imention a few of its most striking successes, b oth achieved and prosp ective. Possible limitation s of quantum eld theory are viewed in the light of its history. I. SURVEY Quantum eld theory is the framework in which the regnant theories of the electroweak and strong interactions, which together form the Standard Mo del, are formulated. Quantum electro dynamics (QED), b esides providing a com- plete foundation for atomic physics and chemistry, has supp orted calculations of physical quantities with unparalleled precision. The exp erimentally measured value of the magnetic dip ole moment of the muon, 11 (g 2) = 233 184 600 (1680) 10 ; (1) exp: for example, should b e compared with the theoretical prediction 11 (g 2) = 233 183 478 (308) 10 : (2) theor: In quantum chromo dynamics (QCD) we cannot, for the forseeable future, aspire to to comparable accuracy.Yet QCD provides di erent, and at least equally impressive, evidence for the validity of the basic principles of quantum eld theory. Indeed, b ecause in QCD the interactions are stronger, QCD manifests a wider variety of phenomena characteristic of quantum eld theory. These include esp ecially running of the e ective coupling with distance or energy scale and the phenomenon of con nement. -
Report of the MPSAC Subcommittee for the Review of the Physics
Report of the MPSAC Subcommittee for the Review of the Physics Frontiers Centers Program of the National Science Foundation Directorate for Mathematical and Physical Sciences 6/28/2019 EXECUTIVE SUMMARY A subcommittee of the National Science Foundation (NSF) Directorate of Mathematical and Physical Sciences (MPS) Advisory Committee (MPSAC) was charged to “conduct an independent assessment” of the Physics Frontiers Center (PFC) program with the following desired outcomes: “Rather than providing specific recommendations, the subcommittee should identify strengths and weaknesses of the PFC program and issues that the Division can address in developing and evolving the program.” The subcommittee was provided with the annual reports of each of the PFCs, their diversity plans, the reports of site-visit teams that visit at years 3 and 5 of the center’s award, and the proposal solicitations. The subcommittee’s evaluation of the relative success of the program is based on the subcommittee’s holistic scientific expertise and judgment. Other sources of input were the PFCs themselves and the broader physics community. STRENGTHS OF THE PFC PROGRAM A. The PFC Environment The subcommittee noted numerous advantages of the PFC program that contribute significantly to the goal of advancing the frontiers of physics. These advantages include: • PFCs Foster Collaborations • PFCs Enable Rapid Responses to Research Developments • PFCs Provide Local Oversight Over Research Progress • Postdoctoral Researchers Mature More Rapidly Within PFCs • PFCs Offer Additional Unique Opportunities to Pursue Research • PFCs Enable the U.S.A. to Better Compete Globally The PFCs create a vibrant and collaborative environment for research and learning. A critical mass of investigators, post-docs, graduate students, and undergraduate researchers are brought into a large collective educational environment with regular seminars and career-building activities, wide-ranging interactions, and distributed mentoring. -
Introduction to General Relativity
INTRODUCTION TO GENERAL RELATIVITY Gerard 't Hooft Institute for Theoretical Physics Utrecht University and Spinoza Institute Postbox 80.195 3508 TD Utrecht, the Netherlands e-mail: [email protected] internet: http://www.phys.uu.nl/~thooft/ Version November 2010 1 Prologue General relativity is a beautiful scheme for describing the gravitational ¯eld and the equations it obeys. Nowadays this theory is often used as a prototype for other, more intricate constructions to describe forces between elementary particles or other branches of fundamental physics. This is why in an introduction to general relativity it is of importance to separate as clearly as possible the various ingredients that together give shape to this paradigm. After explaining the physical motivations we ¯rst introduce curved coordinates, then add to this the notion of an a±ne connection ¯eld and only as a later step add to that the metric ¯eld. One then sees clearly how space and time get more and more structure, until ¯nally all we have to do is deduce Einstein's ¯eld equations. These notes materialized when I was asked to present some lectures on General Rela- tivity. Small changes were made over the years. I decided to make them freely available on the web, via my home page. Some readers expressed their irritation over the fact that after 12 pages I switch notation: the i in the time components of vectors disappears, and the metric becomes the ¡ + + + metric. Why this \inconsistency" in the notation? There were two reasons for this. The transition is made where we proceed from special relativity to general relativity. -
"Eternal" Questions in the XX-Century Theoretical Physics V
Philosophical roots of the "eternal" questions in the XX-century theoretical physics V. Ihnatovych Department of Philosophy, National Technical University of Ukraine “Kyiv Polytechnic Institute”, Kyiv, Ukraine e-mail: [email protected] Abstract The evolution of theoretical physics in the XX century differs significantly from that in XVII-XIX centuries. While continuous progress is observed for theoretical physics in XVII-XIX centuries, modern physics contains many questions that have not been resolved despite many decades of discussion. Based upon the analysis of works by the founders of the XX-century physics, the conclusion is made that the roots of the "eternal" questions by the XX-century theoretical physics lie in the philosophy used by its founders. The conclusion is made about the need to use the ideas of philosophy that guided C. Huygens, I. Newton, W. Thomson (Lord Kelvin), J. K. Maxwell, and the other great physicists of the XVII-XIX centuries, in all areas of theoretical physics. 1. Classical Physics The history of theoretical physics begins in 1687 with the work “Mathematical Principles of Natural Philosophy” by Isaac Newton. Even today, this work is an example of what a full and consistent outline of the physical theory should be. It contains everything necessary for such an outline – definition of basic concepts, the complete list of underlying laws, presentation of methods of theoretical research, rigorous proofs. In the eighteenth century, such great physicists and mathematicians as Euler, D'Alembert, Lagrange, Laplace and others developed mechanics, hydrodynamics, acoustics and nebular mechanics on the basis of the ideas of Newton's “Principles”. -
The Universe Unveiled Given by Prof Carlo Contaldi
Friends of Imperial Theoretical Physics We are delighted to announce that the first FITP event of 2015 will be a talk entitled The Universe Unveiled given by Prof Carlo Contaldi. The event is free and open to all but please register by visiting the Eventbrite website via http://tinyurl.com/fitptalk2015. Date: 29th April 2015 Venue: Lecture Theatre 1, Blackett Laboratory, Physics Department, ICL Time: 7-8pm followed by a reception in the level 8 Common room Speaker: Professor Carlo Contaldi The Universe Unveiled The past 25 years have seen our understanding of the Universe we live in being revolutionised by a series of stunning observational campaigns and theoretical advances. We now know the composition, age, geometry and evolutionary history of the Universe to an astonishing degree of precision. A surprising aspect of this journey of discovery is that it has revealed some profound conundrums that challenge the most basic tenets of fundamental physics. We still do not understand the nature of 95% of the matter and energy that seems to fill the Universe, we still do not know why or how the Universe came into being, and we have yet to build a consistent "theory of everything" that can describe the evolution of the Universe during the first few instances after the Big Bang. In this lecture I will review what we know about the Universe today and discuss the exciting experimental and theoretical advances happening in cosmology, including the controversy surrounding last year's BICEP2 "discovery". Biography of the speaker: Professor Contaldi gained his PhD in theoretical physics in 2000 at Imperial College working on theories describing the formation of structures in the universe. -
A Shorter Course of Theoretical Physics Vol. 1. Mechanics and Electrodynamics Vol. 2. Quantum Mechanics Vol. 3. Macroscopic Phys
A Shorter Course of Theoretical Physics IN THREE VOLUMES Vol. 1. Mechanics and Electrodynamics Vol. 2. Quantum Mechanics Vol. 3. Macroscopic Physics A SHORTER COURSE OF THEORETICAL PHYSICS VOLUME 2 QUANTUM MECHANICS BY L. D. LANDAU AND Ε. M. LIFSHITZ Institute of Physical Problems, U.S.S.R. Academy of Sciences TRANSLATED FROM THE RUSSIAN BY J. B. SYKES AND J. S. BELL PERGAMON PRESS OXFORD · NEW YORK · TORONTO · SYDNEY Pergamon Press Ltd., Headington Hill Hall, Oxford Pergamon Press Inc., Maxwell House, Fairview Park, Elmsford, New York 10523 Pergamon of Canada Ltd., 207 Queen's Quay West, Toronto 1 Pergamon Press (Aust.) Pty. Ltd., 19a Boundary Street, Rushcutters Bay, N.S.W. 2011, Australia Copyright © 1974 Pergamon Press Ltd. All Rights Reserved. No part of this publication 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 Pergamon Press Ltd. First edition 1974 Library of Congress Cataloging in Publication Data Landau, Lev Davidovich, 1908-1968. A shorter course of theoretical physics. Translation of Kratkii kurs teoreticheskoi riziki. CONTENTS: v. 1. Mechanics and electrodynamics. —v. 2. Quantum mechanics. 1. Physics. 2. Mechanics. 3. Quantum theory. I. Lifshits, Evgenii Mikhaflovich, joint author. II. Title. QC21.2.L3513 530 74-167927 ISBN 0-08-016739-X (v. 1) ISBN 0-08-017801-4 (v. 2) Translated from Kratkii kurs teoreticheskoi fiziki, Kniga 2: Kvantovaya Mekhanika IzdateFstvo "Nauka", Moscow, 1972 Printed in Hungary PREFACE THIS book continues with the plan originated by Lev Davidovich Landau and described in the Preface to Volume 1: to present the minimum of material in theoretical physics that should be familiar to every present-day physicist, working in no matter what branch of physics. -
Physics (PHYS) 1
Physics (PHYS) 1 PHYS 270 | INTRODUCTION TO MECHANICS PHYSICS (PHYS) Units: 3 Repeatability: No Core Attributes: First Yr Integration (LC Only), Science/Tech Inquiry area PHYS 102 | PHYSICS OF MODERN LIFE Prerequisites: MATH 150 with a minimum grade of C- or MATH 151 with a Units: 4 Repeatability: No minimum grade of C- Core Attributes: Quantitative reasoning comp, Science/Tech Inquiry area Corequisites: PHYS 270L Non-Core Attributes: Lab A study of the fundamental principles of Newtonian mechanics, kinematics, An introduction to physics concepts and principles with tangents into related and momentum and energy conservation laws. Harmonic oscillations and technologies and global issues. Special attention is paid to devices and networks wave motion will also be discussed. Three hours of lecture weekly. Concurrent that furnish necessities of modern life. No background in physical science is enrollment in 270L required. required. Lab component involves guided hands-on investigation of physics PHYS 270L | MECHANICS LAB principles and related technologies. Units: 1 Repeatability: No PHYS 105 | PHYSICAL SCIENCES FOR K-8 TEACHERS Core Attributes: Science/Tech Inquiry area Units: 3 Repeatability: No Non-Core Attributes: Lab Core Attributes: Science/Tech Inquiry area Prerequisites: PHYS 270 (Can be taken Concurrently) Non-Core Attributes: Lab A laboratory course introducing the concepts and techniques of experimental A laboratory/lecture/discussion class designed to lead students toward an physics. Meets weekly. understanding of selected topics in chemistry and physics. The course topics are PHYS 271 | INTRODUCTION TO ELECTRICITY AND MAGNETISM selected to satisfy the Physical Science specifications of the Science Content Units: 3 Repeatability: No Standards for California Public Schools (K-12). -
Theoretical Physics Introduction
2 Theoretical Physics Introduction A Single Coupling Constant The gravitational N-body problem can be defined as the challenge to understand the motion of N point masses, acted upon by their mutual gravitational forces (Eq.[1.1]). From the physical point of view a fun- damental feature of these equations is the presence of only one coupling 8 3 1 2 constant: the constant of gravitation, G =6.67 10− cm g− sec− (see Seife 2000 for recent measurements). It is even× possible to remove this altogether by making a choice of units in which G = 1. Matters would be more complicated if there existed some length scale at which the gravitational interaction departed from the inverse square dependence on distance. Despite continuing efforts, no such behaviour has been found (Schwarzschild 2000). The fact that a self-gravitating system of point masses is governed by a law with only one coupling constant (or none, after scaling) has important consequences. In contrast to most macroscopic systems, there is no decoupling of scales. We do not have at our disposal separate dials that can be set in order to study the behaviour of local and global aspects separately. As a consequence, the only real freedom we have, when modeling a self-gravitating system of point masses, is our choice of the value of the dimensionless number N, the number of particles in the system. As we will see, the value of N determines a large number of seemingly independent characteristics of the system: its granularity and thereby its speed of internal heat transport and evolution; the size of the central region of highest density after the system settles down in an asymptotic state; the nature of the oscillations that may occur in this central region; and to a surprisingly weak extent the rate of exponential divergence of nearby trajectories in the system. -
Strategic Plan for a 5 - 10 Year Time Horizon Department of Physics and Astronomy
Preliminary Departmental Strategy Report Strategic plan for a 5 - 10 year time horizon Department of Physics and Astronomy DRAFT Executive Summary The next decade will be exciting and productive for the Department of Physics and Astronomy. Existing programs are all remarkably strong and vital, and the Department is poised for a powerful phase of expansion and progress, thanks in large part to the last two decades of faculty recruitments, research initiatives and bridge building with the rest of the University. Even a modest increase in faculty size is assured to have dramatic impact on our scientific productivity and national ranking. Indeed, we believe that an increase of our national rank into the top twenty in the Nation is a realistic goal. Our students, undergraduate and graduate alike, are among the best in the College and our education programs are strong, and will continue to improve. There is much room for improvement in our home building, Bausch and Lomb Hall, which is among the shabbiest of all buildings on the otherwise beautiful Eastman quad. Its poor physical condition belies the world-class research that goes on within; a significant upgrade is not only required for the Department to maintain its high standards, but will also have a potentially huge payoff in sponsored research. An interdisciplinary initiative in nanoscience, and in biophysics an ongoing faculty search, exemplify our broad, cross-departmental identification of the strategic frontiers of physics. Initiated before the recent request for the present report, a departmental strategic planning cycle is well underway and will produce a new faculty recruitment strategic plan in early 2006. -
Quantum Gravity, Effective Fields and String Theory
Quantum gravity, effective fields and string theory Niels Emil Jannik Bjerrum-Bohr The Niels Bohr Institute University of Copenhagen arXiv:hep-th/0410097v1 10 Oct 2004 Thesis submitted for the degree of Doctor of Philosophy in Physics at the Niels Bohr Institute, University of Copenhagen. 28th July 2 Abstract In this thesis we will look into some of the various aspects of treating general relativity as a quantum theory. The thesis falls in three parts. First we briefly study how gen- eral relativity can be consistently quantized as an effective field theory, and we focus on the concrete results of such a treatment. As a key achievement of the investigations we present our calculations of the long-range low-energy leading quantum corrections to both the Schwarzschild and Kerr metrics. The leading quantum corrections to the pure gravitational potential between two sources are also calculated, both in the mixed theory of scalar QED and quantum gravity and in the pure gravitational theory. Another part of the thesis deals with the (Kawai-Lewellen-Tye) string theory gauge/gravity relations. Both theories are treated as effective field theories, and we investigate if the KLT oper- ator mapping is extendable to the case of higher derivative operators. The constraints, imposed by the KLT-mapping on the effective coupling constants, are also investigated. The KLT relations are generalized, taking the effective field theory viewpoint, and it is noticed that some remarkable tree-level amplitude relations exist between the field the- ory operators. Finally we look at effective quantum gravity treated from the perspective of taking the limit of infinitely many spatial dimensions. -
Impact Factor Journals in Physics
Impact Factor Journals in Physics Indexed in ISI Web of Science (JCR SCI, 2019) ______________________________________________________________________________________________________________________ Compiled By: Arslan Sheikh In Charge Reference & Research Section Junaid Zaidi Library COMSATS University Islamabad Park Road, Islamabad-Pakistan. Cell: 92+321-9423071 [email protected] 2019 Impact Rank Journal Title Factor 1 REVIEWS OF MODERN PHYSICS 45.037 2 NATURE MATERIALS 38.663 3 Living Reviews in Relativity 35.429 4 Nature Photonics 31.241 5 ADVANCED MATERIALS 27.398 6 MATERIALS SCIENCE & ENGINEERING R-REPORTS 26.625 7 PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS 25.798 8 Advanced Energy Materials 25.245 9 Nature Physics 19.256 10 Applied Physics Reviews 17.054 11 REPORTS ON PROGRESS IN PHYSICS 17.032 12 ADVANCED FUNCTIONAL MATERIALS 16.836 13 Nano Energy 16.602 14 ADVANCES IN PHYSICS 16.375 15 Annual Review of Fluid Mechanics 16.306 16 Annual Review of Condensed Matter Physics 14.833 17 PROGRESS IN PARTICLE AND NUCLEAR PHYSICS 13.421 18 Physical Review X 12.577 19 Nano-Micro Letters 12.264 20 Small 11.459 21 NANO LETTERS 11.238 22 Laser & Photonics Reviews 10.655 23 Materials Today Physics 10.443 24 SURFACE SCIENCE REPORTS 9.688 25 CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE 9.571 26 npj 2D Materials and Applications 9.324 27 PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 8.892 28 Annual Review of Nuclear and Particle Science 8.778 29 PHYSICAL REVIEW LETTERS 8.385 1 | P a g e Junaid Zaidi Library, COMSATS