Physics 1501 - Modern Technology An undergraduate course offered at the University of Winnepeg on introductory physics. All lecture notes are online, and include material on relativity and quantum theory. http://theory.uwinnipeg.ca/mod_tech/tech.html
Ether And The Theory Of Relativity Ether and the Theory of relativity. More careful reflection teaches us, however, that the special theory of relativity does not compel us to deny ether. http://www.tu-harburg.de/rzt/rzt/it/Ether.html
Extractions: Albert Einstein, an address delivered on May 5th, 1920, in the University of Leyden HOW does it come about that alongside of the idea of ponderable matter, which is derived by abstraction from everyday life, the physicists set the idea of the existence of another kind of matter, the ether? The explanation is probably to be sought in those phenomena which have given rise to the theory of action at a distance, and in the properties of light which have led to the undulatory theory. Let us devote a little while to the consideration of these two subjects. When in the first half of the nineteenth century the far-reaching similarity was revealed which subsists between the properties of light and those of elastic waves in ponderable bodies, the ether hypothesis found fresh support. 1t appeared beyond question that light must be interpreted as a vibratory process in an elastic, inert medium filling up universal space. It also seemed to be a necessary consequence of the fact that light is capable of polarisation that this medium, the ether, must be of the nature of a solid body, because transverse waves are not possible in a fluid, but only in a solid. Thus the physicists were bound to arrive at the theory of the ``quas-irigid'' luminiferous ether, the parts of which can carry out no movements relatively to one another except the small movements of deformation which correspond to light-waves. This theory also called the theory of the stationary luminiferous ether moreover found a strong support in an experiment which is also of fundamental importance in the special theory of relativity, the experiment of Fizeau, from which one was obliged to infer that the luminiferous ether does not take part in the movements of bodies. The phenomenon of aberration also favoured the theory of the quasi-rigid ether.
(Australia) University Of Adelaide Mathematical Physics in the Department of Physics and Mathematical Physics. Research areas quantum field theory, string theory, statistical mechanics, theoretical condensed matter. physics, general relativity, quantum gravity and cosmology http://www.physics.adelaide.edu.au/mathphysics/
Math.washington.edu/~hillman/relativity.html AEI relativity Links Living Reviews. Impressum. MaxPlanck-Institut für Gravitationsphysik, Albert-Einstein-Institut, Home. relativity and Quantum Gravity Groups. relativity Services. http://math.washington.edu/~hillman/relativity.html
A Study Of A Model Cosmology Contains a cosmology tutorial. Preliminary introduction to General relativity and its application to Cosmology. Also study of stringy matter as a part of the Universe. http://surhudm.tripod.com/seminarhtml
Extractions: B.Tech Seminar Report on A Study of a model Cosmology Submitted for the partial fulfillment of the requirements for the degree of Bachelor of Technology by More Surhud Shrikant under the guidance of Prof. Urjit A. Yajnik (Department of Physics) Department of Physics Indian Institute of Technology Bombay November 17, 2003 Recent advances in Cosmology have taken us closer to understand our Universe better. We study preliminary General relativity and its application to Cosmology. Initially we develop the background for the Friedmann models and analyse their behaviour. Later we modify them to incorporate recent observations from the Cosmic Background Explorer(COBE), Wilkinson Microwave Anisotropy Probe, Supernova Cosmology Project and Hi-z Supernova project. We also examine the possibility of stringy matter as being a part of our Universe motivated by particle physics considerations and as a possible explanation for the Ultra High Energy Cosmic Rays.
Being And Becoming In Modern Physics Discusses implications of general relativity for the philosophy of time; by Steven Savitt. http://plato.stanford.edu/entries/spacetime-bebecome/
Extractions: JUL Does time flow or lapse or pass? Are the future or the past as real as the present? These metaphysical questions have been debated for more than two millennia, with no resolution in sight. Modern physics provides us, however, with tools that enable us to sharpen these old questions and generate new arguments. Does the special theory of relativity, for example, show that there is no passage or that the future is as real as the present? The focus of this entry will be these new questions and arguments. Around 500 B. C. Heraclitus wrote the following: Everything flows and nothing abides; everything gives way and nothing stays fixed. You cannot step twice into the same river, for other waters and yet others, go flowing on.
Gen. Relativity Cosmology GENERAL relativity COSMOLOGY. As Elementary Particle Physicists direct their attention ``down toward the indescribably tiny, so http://musr.physics.ubc.ca/~jess/p200/cosm/cosm.html
Extractions: Next: Astronomy As Elementary Particle Physicists direct their attention ``down'' toward the indescribably tiny, so Cosmologists turn their gaze ``upward'' toward the unfathomably huge. Of course, these days both are increasingly likely to be incarnate in the same individual - I'll get to that later. As one who has never looked through a telescope larger than I could carry, I am certain to give short shrift to the magnificent observational science of astronomy , which provides cosmology (a theoretical discipline) with all its data. But a summary of the former without good colour plates of star fields and nebulae would be a terrible waste anyway, so I hope I have motivated the curious to go out and read a good Astronomy book on their own. Moreover, I am so ignorant of General Relativity and most of the fine points of Cosmology that I really have no business writing about either. Therefore I must content myself with a justification in terms of my ``unique point of view,'' whereby I excuse the following distortions.
GrayAlbert A two part overview of the Shapiro radar bounce test of general relativity. (The two parts consist of a section for normal people, and one for nerds) http://world.std.com/~sweetser/PopScience/timeDelay/timeDelay.html
Extractions: installation 1995 For Folks It takes a few minutes for light to get to Mercury from Earth, but it takes a little longer due to the Sun. Radar signals from the Haystack Observatory in Westford Massachusetts were sent out into space to bounce off Mercury. The time the radar signals spent flying between the two planets was carefully measured. As the radar's path in space moved closer to the Sun, a small time delay grew in the radar reflections which is given by equations in the big, black book (Gravitation, by Misner, Thorne and Wheeler). Written in chalk is the artist's method to calculate the time delay. The tools used come directly from quantum mechanics which is not supposed to be an aid for such a calculation. Yet the results are the same (equation 40.13). For Nerds Irwin I. Shapiro measured the time delay of radar reflections off Mercury caused by the gravitational field of the Sun. The logarithmic dependence on the impact parameter confirmed general relativity's prediction. The Lorentz group will be employed for a similar end. The gravitational fields for a bound test mass are characterized by a member of the Lorentz group in the following manner: take the Newtonian orbital velocity
Living Reviews In Relativity: COMPENDIUM History of relativity. Mathematical relativity. Numerical relativity. Physical Cosmology. Quantum General relativity. relativity in Astrophysics. http://www.emis.de/journals/LRG/sitecontents.html
Extractions: -But what about the hole that the "hole" left behind? Particle theory says that for every fermion type there is another fermion type that has exactly the same mass, and therefore no priori distinction between matter and anti-matter. Dirac's "Sea of Electrons" was dismissed as implausible for this reason, but the opposite value of all other charges (quantum numbers), indicates that the asymmetry between the two classes of particles is due to the fact that the anti-particle, (the "hole"), has -rho and negative mass, until it becomes a real particle. Abstract: The "Entropic Constant" produces the proverbial Theory of Everything once the Anthropic Principle is understood by way of the thermodynamic algorithm that gives rise to the history of man. The process exposes a grand scale cosmic coincidence which is otherwise known as "Punctuated Equilibria", that gets revealed at the universal level by way of the correct application of Dirac's Equation to this thermodynamic phenomenon as it applies to Particle Physics. The GUT then falls out of the ToE once the actual physics of " The -1th Law " of Thermodynamics is produced by this physics. The following is condensed from articles taken from the physicist moderated research group
Special Relativity, Physics Mar. 7, 2003The Theoretical Basis for Superluminal Speeds and Superconductivity July 9, 2002 The Synthesis of Mechanics, relativity and Quantum Physics. http://wbabin.net/
Extractions: Joseph Rybczyk Comments Jeff Alford Mohammed Asif Dr. Bruce Barron Nico Benschop Ralph E. Bradley Dean Brodie D. Butterworth Marcelo Crotti E. C. Devito Sr. F. Fernandez Jerry Iuliano Eit Gaastra Ivar Giavar Chris Heilman J. Y. Hopkins J.V. Kadeisvili Dr. H. Kahn Nouman Kahn Steven Kearny Yuri Keilman R. M. Kiehn Dr. Klauder Gregg Kolpin Jack Martinelli Miles Mathis Dr. D. McLennan Mathew Milne S.Miscione Don Myers A. K. Nguyen Dan O'Donnell S. Ong Huei Ling Ian S. Parry Frank Pearce C. Rebigsol Neville Rickert Joseph Rybczyk James Saba Ajay Sharma Prof. C. Stuart A. Timofeev Sophie Thomas Prof. J. S. Toll David Utterback Pentcho Valev B. Van't Woudt Keith Wigdor M. H. Williams Harry Yosh Misc. Rejections List of Authors Jeff Alford Sam Azar S. Baranow Dr. Bruce Barron E. Billinghurst Gong BingXin Dr. Boldyreva Arthur Bolstein D Butterworth Kapil Chandra Nigel Cook Marcus Coleman Max Concern Alan Cresswell Marcelo Crotti A. A. Faraj Fabio Fernandez Viraj P.L. Fernando Dr. Randy Frid
Concept Of Space And Time In Special Relativity This java applet invites you to the world of space and time in special relativity. http://webphysics.davidson.edu/Applets/TaiwanUniv/relativity/relativity.html
Extractions: Space and Time in Special Relativity The special theory of relativity is the result of two postulates: The speed of light in empty space is the same for all inertial frames. From the above two postulates, our understanding of space and time has to be modified. This java applet invites you to the world of space and time in special relativity. There are two devices that utilize photons to measure time differences (some kind of clock). There is no relative motion between the two devices. Now, change the relative velocity from the selections (
Usenet Relativity FAQ Version Date 17 May 1998 Usenet relativity FAQ. This is the web version of the Usenet relativity FAQ (Frequently Asked Questions). Special relativity. http://www.weburbia.demon.co.uk/physics/relativity.html
Extractions: Version Date: 17 May 1998 Usenet Relativity FAQ This is the web version of the Usenet Relativity FAQ (Frequently Asked Questions). Its purpose is to provide good answers to questions which have been discussed often in sci.physics.relativity and related usenet newsgroups. The articles in this FAQ are based on those discussions and on information from good reference sources. That does not mean that they are always perfect and complete. If you have corrections, updates or additional points to make please send E-mail to me, the editor, Philip Gibbs at relfaq@weburbia.com . You can also raise the subject in the newsgroups if you really think you have something new to say. If you want to write up an article following a discussion about a subject not yet covered here then feel free to send it to me, but please do not use this address to ask new questions. Ask them in the appropriate newsgroup instead. If you are new to this newsgroup, please read "Welcome! to sci.physics.relativity" and "An Introduction to the Physics Newsgroups"
Journal Of Lie Theory A short history of the life and work of Sophus Lie, whose work, Lie groups, has applications in quantum mechanics in relativity. http://www.emis.de/journals/JLT/vol.9_no.1/1.html
General Relativity In The Global Positioning System General relativity in the global positioning system. Neil Ashby University of Colorado n_ashby@mobek.colorado.edu. The Global Position http://www.phys.lsu.edu/mog/mog9/node9.html
Extractions: n_ashby@mobek.colorado.edu The Global Position System (GPS) consists of 24 earth-orbiting satellites, each carrying accurate, stable atomic clocks. Four satellites are in each of six different orbital planes, of inclination 55 degrees with respect to earth's equator. Orbital periods are 12 hours (sidereal), so that the apparent position of a satellite against the background of stars repeats in 12 hours. Clock-driven transmitters send out synchronous time signals, tagged with the position and time of the transmission event, so that a receiver near the earth can determine its position and time by decoding navigation messages from four satellites to find the transmission event coordinates, and then solving four simultaneous one-way signal propagation equations. Conversely, gamma-ray detectors on the satellites could determine the space-time coordinates of a nuclear event by measuring signal arrival times and solving four one-way propagation delay equations. Apart possibly from high-energy accelerators, there are no other engineering systems in existence today in which both special and general relativity have so many applications. The system is based on the principle of the constancy of c in a local inertial frame: the Earth-Centered Inertial or ECI frame. Time dilation of moving clocks is significant for clocks in the satellites as well as clocks at rest on earth. The weak principle of equivalence finds expression in the presence of several sources of large gravitational frequency shifts. Also, because the earth and its satellites are in free fall, gravitational frequency shifts arising from the tidal potentials of the moon and sun are only a few parts in
A Study Of A Model Cosmology Contains report of a seminar on a model cosmology. Preliminary introduction to General relativity with application to cosmology. http://khwarizmi.phy.iitb.ac.in/~surhud/seminarhtml/index.html
Extractions: B.Tech Seminar Report on A Study of a model Cosmology Submitted for the partial fulfillment of the requirements for the degree of Bachelor of Technology by More Surhud Shrikant under the guidance of Prof. Urjit A. Yajnik (Department of Physics) Department of Physics Indian Institute of Technology Bombay November 17, 2003 Recent advances in Cosmology have taken us closer to understand our Universe better. We study preliminary General relativity and its application to Cosmology. Initially we develop the background for the Friedmann models and analyse their behaviour. Later we modify them to incorporate recent observations from the Cosmic Background Explorer(COBE), Wilkinson Microwave Anisotropy Probe, Supernova Cosmology Project and Hi-z Supernova project. We also examine the possibility of stringy matter as being a part of our Universe motivated by particle physics considerations and as a possible explanation for the Ultra High Energy Cosmic Rays.
FearOfPhysics.com Albert Einstein`s Theory Of Relativity Click here. Albert Einstein`s Theory of relativity. Albert Einstein was one of the greatest, if not the greatest physicist the world has ever known. http://www.fearofphysics.com/Relativity/relativity.html
Extractions: Home Relativity Physics Help: Trouble with your physics homework? Get help with a year-long class for $19.99. Click here. Albert Einstein`s Theory of Relativity Albert Einstein was one of the greatest, if not the greatest physicist the world has ever known. His greatest achievement was his Theory of Relativity, which tells us about many things, including what would happen to our view of the world if we could travel very fast. "Very fast" here does not mean something like 100 miles per hour, or even as fast an a 747 airplane, or the Space Shuttle. Very fast here means, close to the speed of light, which is 186,000 miles per second, or 300,000,000 meters/second, or about 1 foot every nanosecond. This page will try to show you what a house might look like if you flew by is at one of these "near speed of light" speeds. First off though, how is it that you can see a house? Take a look at the picture below: You can't see anything if there's no light, so here, the Sun is illuminating the house. Notice that some of the Sun's light rays bounce off of the house and into your eyes. It is through these rays that you are able to see the house. Now, light rays travel at the speed of light (obviously). What would happen if you were moving to the right at very near the speed of light? It seems like you'd sort of be racing with the light rays bouncing off of the house. They'd have a hard time catching you to get into your eyes! Also, rays that have to travel greater distances (like the one that bounces off of the bottom of the house) wouldn't even catch you until a bit later than the rest!
History QM vs. relativity http://www.quantumphil.org/history.htm
Extractions: History John Bell During 1988, I came in contact with John Bell in the CERN , the European Laboratory for Particle Physics in Geneva. With his support and collaboration, I launched the activity of the Center for Quantum Philosophy , promoting talks in the CERN and in various European universities. These activities aimed to stimulate the discussion on the philosophical and scientific challenges raised by the quantum theory, and show that this theory is now an integral part of knowledge and culture. In the CERN held talks among others: Herwig Schopper, John Bell, Constantin Piron, Nicolas Gisin, Asher Peres, John Ellis. Particular mention deserves a colloquium in Cologne (Germany) on May 13-14, 1990, organized in collaboration with the Lindenthal-Institute and the Institute for Theoretical Physics of the University of Cologne, at which participated two major exponents of Nonlocality research: John Bell and Anton Zeilinger (see in German).
General Relativity -- From Eric Weisstein's World Of Physics General relativity, References. Adler, R.; Bazin, M.; and Schiffer, M. Introduction to General relativity, 2nd ed. New York McGrawHill, 1975. http://scienceworld.wolfram.com/physics/GeneralRelativity.html
Extractions: A theory invented by Albert Einstein which describes gravitational forces in terms of the curvature in space caused by the presence of mass. The fundamental principle of general relativity asserts that accelerated reference frames and reference frames in gravitation fields are equivalent. General relativity states that clocks run slower in strong gravitational fields (or highly accelerated frames), predicting a gravitational redshift . It also predicts the existence of gravitational lensing gravitational waves gravitomagnetism , the Lense-Thirring effect , and relativistic precession of orbiting bodies. Bardeen-Petterson Effect Bertotti-Robinson Solution Black Hole Black Hole No Hair Theorem ... Schwarzschild Black Hole
Southampton GR Explorer Home Page An introduction to Einstein's theory of General relativity and related topics. These pages include informative text, pictures and movies. http://www.maths.soton.ac.uk/relativity/GRExplorer/
Extractions: Welcome to the Southampton GR Explorer. On these pages you will find an overview of Einstein's theory of General Relativity and related topics. We focus on subjects that are close to the research interests of the Southampton group. A more technical description of our various ongoing research projects can be found here This site is best viewed with frames, which are not supported by your browser. You can either:
