Physics

Materials Science & Technology Research Publications Materials Science & Technology Research Publications- Electronic Publications; Page charge for authors and per downloaded article charge for readers. New Materials International New Materials International- Trade Journal - free online articles , suppliers, news Interactive Visualization of Gravitation as Spacetime Curvature Interactive Visualization of Gravitation as Spacetime Curvature- Interactive Flash animation of a smaller test mass in the gravitational field of a larger mass, following the laws… Visualization of the Theory of Relativity Visualization of the Theory of Relativity- Online papers, images, movies and paper models. C-Ship C-Ship- A short overview of special relativity, filled with relativistic ray traced images. Explains relativistic effects using a theoretical spaceship. Relativistic Ray Traced Images Relativistic Ray Traced Images- Features visualization of relativistic deformation effects of a spaceship like object. Warp Special Relativity Simulator Warp Special Relativity Simulator- A windows program to show you the weird effects of special relativity. OpenGL Relativistic Spacetime Project OpenGL Relativistic Spacetime Project- A real time relativity simulator for Windows, Linux and OS/2, using OpenGL. Relativistic Starflight Relativistic Starflight- The program xrel depicts, as realistically as possible, the appearance of stars as seen from a starship moving at speeds close to the speed of light. How to Build a Time Machine How to Build a Time Machine- Article in Scientific American, written by Paul Davies. Covers time travel into the future in special and general relativity and a variety of hypothet… Time Travel and Modern Physics Time Travel and Modern Physics- Article from the Stanford Encyclopedia of Philosophy about the basis of time travel scenarios in modern physics, including a discussion of mechanis… The Relativistic Asynchronous Machine The Relativistic Asynchronous Machine- Design of a hypothetic machine for travel into the future by Tilmann Schneider. Everything You Always Wanted to Know About Time Travel Everything You Always Wanted to Know About Time Travel- A collection of brief articles by the renowned non-fiction author John Gribbin. Includes "How to build a time machine", art… Time Travel - Fact or Fiction? Time Travel - Fact or Fiction?- Brief overview of physics issues related to time travel, including the question of conversation laws, general relativity, possible paradoxes, and t… Time Loops Time Loops- An interview on Edge with the author and physicist Paul Davies about time travel and the ensuing paradoxes, physical time-travel scenarios from Gödel's universe t… Quantum Time Travel Quantum Time Travel- Brief description of the work by Yakir Aharonov's group on a "quantum time machine", including parallels with published science-fiction stories. From John G. … Space-Time Physics and the Future of Time Travel Space-Time Physics and the Future of Time Travel- Elementary exposition of Euclidean geometry, Newton vs. Einstein, and the possibility to travel into the future, and see into the… Getting in a Twist over Time Getting in a Twist over Time- Article on Space Daily about Ron Mallet's attempts to design a time machine using a loop of laser light. By Michael Brooks; also includes a brief his… Taking the Cosmic Shortcut Taking the Cosmic Shortcut- Article on the site of the Australian Broadcasting Corporation about the physics of time travel, from special relativity and time travel into the futur… Chronos Shrugged: The World of Time Travel Chronos Shrugged: The World of Time Travel- A brief tour of the world of time travel - from the myths and psychology to the science (including relativity). Also includes a bibliog… NOVA Online: Time Travel NOVA Online: Time Travel- Companion site to the NOVA program "Time Travel" (1999); includes a description of the connection with Einstein's theories of relativity, an interview wi… How Stuff Works: Special Relativity How Stuff Works: Special Relativity- The major principles of special relativity (SR) are discussed in an accessible way, via 5 segments, to help you understand the lingo and theor… The Structure of Space-Time Transformations The Structure of Space-Time Transformations- This theorem by H. J. Borchers and G. C. Hegerfeldt proves that the constancy of light velocity alone implies the Lorentz group (up to… Special Relativity Special Relativity- Download Christoph Schiller's 1612 page walk through the whole of physics, from classical mechanics to relativity, electrodynamics, thermodynamics, quantum the… Relativity (Kinematics) Relativity (Kinematics)- Chapter of a classical mechanics text describes spatiotemporal effects. Includes problems and solutions. Uniform Acceleration Uniform Acceleration- This paper analyzes several simple uniform acceleration problems, including the paradox of John Bell. Simple Derivation of the Special Theory of Relativity Without the Speed of Light Axiom Simple Derivation of the Special Theory of Relativity Without the Speed of Light Axiom- Special relativity may be derived just from assuming isotropy, homogeneity and a principle … The Doppler Shift Equation For An Accelerating Frame of Reference The Doppler Shift Equation For An Accelerating Frame of Reference- The exact equation for the Doppler shift in a uniformly accelerating rocket is derived in two different ways. Th… A Special Relativity Paradox: The Barn and the Pole A Special Relativity Paradox: The Barn and the Pole- The answer to the famous barn and the pole paradox is that the two doors are never closed at the same time in the runner's fra… Derivation of the Lorentz Transformation Derivation of the Lorentz Transformation- This derivation uses the group property of the Lorentz transformations, which means that a combination of two Lorentz transformations als… Understanding Special Relativity Understanding Special Relativity- Brief explanation of special relativity, using no more than high-school level mathematics; includes an account of the twin paradox, some remarks … Wikipedia: Introduction to Special Relativity Wikipedia: Introduction to Special Relativity- Encyclopedia article giving a brief outline of the basic concepts of special relativity (including simple formulas). The Special Theory of Relativity The Special Theory of Relativity- Self-tutorial with short essays, questions and answers. Imaginary In All Directions Imaginary In All Directions- There is a preferred algebra of quaternions and complex numbers that is ideally suited to express the equations of special relativity and classical el… Space Measurements on a Rotating Platform Space Measurements on a Rotating Platform- The age-old puzzling problem of Lorentz contraction on a rotating platform, i.e., Ehrenfest's paradox, is explained in its proper mathem… Sagnac Effect, Twin Paradox and Space-Time Topology Sagnac Effect, Twin Paradox and Space-Time Topology- When viewed with an alternative synchronization convention, the Sagnac effect on a rotating disk is purely topological and the… The Twin Paradox in a Spatially Closed and Bounded Universe The Twin Paradox in a Spatially Closed and Bounded Universe- Spatially compact spacetimes break global Lorentz invariance and define absolute inertial frames of reference. Nothing but Relativity Nothing but Relativity- There are many ways to derive the Lorentz transformation without invoking Einstein's constancy of light postulate. The path preferred in this paper restate… Deriving Relativistic Momentum and Energy. II. Deriving Relativistic Momentum and Energy. II.- The usual relativistic expressions for momentum and kinetic energy are generalized from the one-dimensional to the three-dimensiona… Deriving Relativistic Momentum and Energy Deriving Relativistic Momentum and Energy- Expressions for momentum and energy of a relativistic particle may be derived from the composition law for velocities along one spatial … On the Electrodynamics of Moving Bodies On the Electrodynamics of Moving Bodies- Albert Einstein's first paper on relativity, translated here from Annalen der Physik vol XVII 1905 p. 891-921, is of historical interest. Lorentz Contraction and Accelerated Systems Lorentz Contraction and Accelerated Systems- Lorentz contraction in systems undergoing constant proper acceleration is proven to be completely self-consistent in the context of sp… Relativistic Force Transformation Relativistic Force Transformation- Formulas relating one and the same force in two inertial frames of reference are derived directly from the Lorentz transformation of space and t… Geometric Algebra for Physicists Geometric Algebra for Physicists- This is chapter 1 of a book by Chris Doran and Anthony Lasenby on geometric algebra, which is the natural mathematics of spacetime. E=mc² E=mc²- An article from the Wikipedia encyclopedia. Generalized Relativistic Velocity Addition with Spacetime Algebra Generalized Relativistic Velocity Addition with Spacetime Algebra- The general problem of relativistic addition of velocities – and the successive application of noncollinear Lore… Special Relativity Special Relativity- Tutorial explains about the postulates, paradox, simulaneity, time dilation, Lorentz transformation constructions, spacetime wheel, and the Fitzgerald-Lorentz … Time Dilation Time Dilation- The gamma factor and time dilation can be derived using a very simple clock. Einstein Light Einstein Light- A multimedia tutorial on Special Relativity. The introductory level takes 10 minutes, but has links to over 40 explanatory pages giving greater depth and breadth. A Derivation of the Lorentz Transformation From a Simple Definition of Time A Derivation of the Lorentz Transformation From a Simple Definition of Time- The fundamental equations of special relativity are derived with only high school algebra and toy univ…