Relativity
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- Experimental Basis of Special Relativity
- A summary of tests of the foundations and predictions of special relativity, by Tom Roberts, Siegmar Schleif and others. Part of the Physics FAQ.
- 42
- Experimental Tests of Relativistic Gravity
- Slides and audio for a talk given by Thibault Damour (IHES) at the Kavli Institute for Theoretical Physics (UCSB); information about the Parametrized Post-Newtonian Formalism, classical tests, and recent as well as future satellite tests of general relativity.
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- Gravity Probe B
- Gravity Probe B is the relativity gyroscope experiment being developed by NASA and Stanford University to test two extraordinary, unverified predictions of Albert Einstein's general theory of relativity.
- 44
- Shapiro Radar Bounce Test
- 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)
- 45
- Gravitational Lens Data Base
- Homepage of CASTLEs, a gravitational lensing survey based at the Harvard-Smithsonian Center for Astrophysics. The main feature is a data base, complete with images, of all gravitational lens candidates that astronomers have identified so far.
- 46
- Gravitational Lenses
- Site hosted by the Université de Liège; features a bibliography, a list of lensing candidates, and descriptions of didactical experiments (involving glass lenses) useful for a better understanding of the phenomenon.
- 47
- Gravitational Lensing with Wineglasses
- Explains how gravitational lensing can be simulated using wine glasses as (unusually-shaped) glass lenses. Includes images and diagrams to explain the different phenomena gravitational lensing can produce. By Phil Marshall (Stanford University).
- 48
- HubbleSite News Center: Gravitational Lenses
- List of images taken by the Hubble Space Telescope of Gravitational Lenses (including the famous Einstein Cross picture); updated continually.
- 49
- Gravitational Wave Group
- Members, research, thesis, proceedings, LCGT Project, information, and links. At the Institute for Cosmic Ray Research, University of Tokyo.
- 50
- Harry Collins's Gravitational Wave Project
- Website about a long-running project on sociological aspects of the search for gravitational waves (Cardiff University). Includes some preprints and articles, as well as summaries of the different parts of the project.
- 51
- 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 frame of reference.
- 52
- Derivation of the Lorentz Transformation
- This derivation uses the group property of the Lorentz transformations, which means that a combination of two Lorentz transformations also belongs to the class Lorentz transformations. [PDF]
- 53
- 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 dimension.
- 54
- Deriving Relativistic Momentum and Energy. II.
- The usual relativistic expressions for momentum and kinetic energy are generalized from the one-dimensional to the three-dimensional case.
- 56
- 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.
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- How Do You Add Velocities in Special Relativity?
- Here is the formula for adding velocities in special relativity when motion occurs in a single direction.
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- 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 restates a simple, established approach. [PDF]