Qu'est ce que la relativité Générale d'Albert Einstein

Résumé du document

Everyone has heard of Albert Einstein's “E=MC²”, which he made popular in 1905 in his theory of special relativity, but that general of relativity, which he published in 1915, is not as famous.

Extraits

[...] Unlike Newton's works, this revolutionary theory thus helps understand phenomena such as the expansion of Universe, gravitational waves and black holes, which were already witnessed but had so far been left unexplained. To better understand how the theory works, we should take a look at the high-precision tests that were carried out by the Cassini space probe: radio signals were sent to Earth but took longer than planned on the basis of distance and speed to reach our planet. This means they were delayed on their way by the deformation of space-time by the enormous mass of the Sun. [...]

[...] GENERAL RELATIVITY FOR BEGINNERS Everyone has heard of Albert Einstein's "E=MC²", which he made popular in 1905 in his theory of special relativity, but that general of relativity, which he published in 1915, is not as famous. Einstein aimed at understanding the real nature of gravity and our perception of it, and this implies having some minimal knowledge in the concepts of space, time, and matter. Indeed, the theory resorts to equations to describe the interaction of the space-time continuum and matter, which we call gravity. [...]

[...] But when a wave is sent to an object, it seems to go faster as it is nearing the object. Actually, its speed remains the same, but it is the distance (the space-time continuum) that reduces. As a result, black holes have so much attraction force that even light, usually the fastest element in the Universe, has not enough speed to escape it. Now it may be easier to understand how some people figure out space travel by distorting, that is, shortening, space-time, but the amount of energy needed would be prohibitively high. [...]