Space time

See also: Mef=la re-examined on line [[EspacesTemps.net]], [[EspacesTemps]]

The notion of space time was introduced at the beginning of the Années 1900 and was taken again in particular by Minkowski in 1908 in a mathematical talk on the geometry of space and time such as it had been defined by the theory of the restricted Relativité of Albert Einstein. This one had published in 1905 an article devoted to with the fundamental laws of electromagnetism On the electrodynamics of the bodies moving

This theory is one of the great upheavals to the beginning of the 20th century in the field of the Physique. (See also the problem of “ether”).

The Continuum space time comprises four dimensions: three dimensions for space, X, there, and Z, and for time, T. An event positions in time and space by its coordinates ct, X, there, Z which depend all on the reference frame.

It is very difficult to think that time is not the same following the reference frame in which one measures it and this is however well confirmed in experiments in particular in the particle accelerator of CERN.

Time depends on the reference frame in which it is measured and is thus not absolute. The same applies to space. The length of an object can be different according to the reference frame from measurement.

Only the space time like unified concept, which is mathematically a Espace of Minkowski, exists in the absolute, while its components of space and times are aspects which depend on the point of view of (reference frame).

The relationship between measurements of space and time given by the universal constant $c$ (speed of light in the vacuum) makes it possible to describe a distance D in term of time: D = ct with T time necessary with the light to traverse D . The Sun is to 150 million kilometers i.e. to 8 minute-light of the Ground. By saying “minute-light”, one speaks about a measurement of time multiplied by C, and one obtains a measurement of distance, in this case, of the kilometers. In other words C is used to convert units of time into units of distance. Kilometers and minute-light are thus two measuring units of distance.

What unifies space and time in the same equation, it is that the measurement of time can be transformed into measurement of distance (by multiplying T, expressed in units of time, by c), and T can thus so be associated with the three other coordinates with distance in an equation where all measurements are in units of distance. In this direction one could say that time, it is space!

See too

Reference

Random links: