## A detailed account of the early history of SRT is given in:

**Hallstatt | Evangelical Church:** The Neo-Gothic Evangelical Church of Christ exists since 1863. Today, as well as sermons, many cultural events are held there.

Photo provided by Flickr

A discussion of the basic technique of using measurements of the anomalous magneticmoment of electrons and muons as a test of SR, and an analysis of some low-energy electrondata.

## —; translated by Perrett and Jeffery; reprinted in:

Photo provided by Flickr

This is one of the most accurate limits on any anisotropy in the __round-trip__speed of light in a laboratory. They measured the beat-frequency between a single-modelaser on a rotating table and a single-mode laser fixed to the Earth to put a limit onsuch an anisotropy of 3 parts in 10^{15}. Due to the construction of theirrotating laser, this can also be interpreted as a limit on any anisotropy of space. Thisis a round-trip experiment because of their use of a Fabry-Perot etalon to determine thefrequency of the rotating laser. Note that their limit on the round-trip anisotropycorresponds to a round-trip speed of less than 0.000001 m/s (!); in terms of the moreusual one-way anisotropy it is 30 m/s.

## A limit of 1.2×10−51 g (6×10−19 eV/2).

The dispersion relation basically expresses conservation of probability, and itsvalidity at different energies is related to relativistic kinematics.

## Set an upper limit on aether drift of 4 km/s.

Note that the nomenclature has changed over the past century, and current literaturefocusses more on rest mass than relativistic mass because rest mass is an invariantproperty of an object. In this article, use of the word "mass" means restmass. See also FAQ page.

## A more general perturbative framework is developed.

is basically the study of how energy and momentum conservationlaws constrain and affect physical interactions. The two basic predictions of SR in thisregard are that massive objects will have a limiting velocity of (the speedof light), and that their “relativistic mass” will increase withvelocity. This latter property implies that the newtonian equations for conservation ofenergy and momentum will be violated by enormous factors for objects with velocitiesapproaching , and that the corresponding formulas of SR must be used. This hasbecome so obvious in particle experiments that few experiments test the SR equations, andvirtually all particle experiments rely upon SR in their analysis. The exceptions areprimarily early experiments measuring energy as a function of velocity for electrons andprotons.

## Variations on the Hughes-Drever experiment.

An analysis combining the results of several experiments gives the result that theLorentz limiting velocity must be equal to the speed of light to within 12 parts permillion.

## Various measurements of the lifetimes of muons.See also:

He discusses some Mössbauer experiments that show that the rate of a clock isindependent of acceleration (~10^{16} g) and depends only upon velocity.