What is the General theory of relativity?


2020-07-14 00:20:09




1Like 0Dislike


What is the General theory of relativity?

General relativity is a geometric theory of gravitation, developing his special theory of relativity

General relativity is a fundamental building block of modern physics. She explains gravity based on the ability of space «bend», or, more specifically, connects the force of gravity with the changing geometry of space-time. founded «Common» theory of relativity (GTR) in 1915, ten years after the creation of «special» theory, applying a universal speed of light, and assuming that the laws of physics remain constant in any given reference frame. But so does General relativity complicated as it may seem at first glance?

How to understand General relativity?

The General theory of relativity can be summed up in just 12 words:«space-time tells matter how to move; matter tells space-time how to bend». But this brief description made by the physicist John Wheeler, hides a more complex and deep truth. In addition to the quantum theory, is one of the two pillars of modern physics – our working theory of gravity and a very large theory of the planets, galaxies and the Universe as a whole. It is a continuation of the special theory of relativity – but it is so massive that it took him 10 years, from 1905 to 1915, to go from one to the other.

As the New Scientist, according to the special theory of relativity (str) motion warps space and time. Einstein's General relativity combined it with the principle, observed by Galileo more than three centuries ago: falling objects accelerate with the same speed regardless of their mass.

Feather and a hammer fell from the leaning tower of Pisa will hit the ground at the same time, if you do not consider air resistance.

After Galileo Isaac Newton showed that this can be true only if there is a strange coincidence: the inertial mass, which quantifies the body's resistance to acceleration, must always be equal to the gravitational mass, which quantifies the body's response to gravity. There is no obvious reason why this should be so, but no single experiment is never shared these two values.

Just as he used the constant velocity of light to build the special theory of relativity, Einstein declared it a principle of nature: the principle of equivalence. Armed with this new concept of space and time as intertwined «space-time» you can build a picture in which gravity is just a form of acceleration.

Massive objects bending space-time around itself, causing objects to accelerate toward them.

Although gravity dominates the large space scales and near very large masses such as planets or stars, she really is the weakest of the four known forces of nature – and the only thing not explained by quantum theory. Quantum theory and General relativity apply at different scales. This makes it difficult to understand what happened in the earliest moments of the Big Bang, for example, when the universe was very small, and the strength of gravity is huge. In another situation, when these forces collide at the event horizon of a black hole, there are unsolvable paradoxes.

for Example, quantum mechanics has a way to take into account concepts such as infinity, but if we try to do the same with the General theory of relativity, mathematics generates predictions that do not make sense.

Some physicists are pinning their hopes that one day some «theory of everything» will be able to combine quantum theory and General relativity, although these attempts, such as string theory and the theory of loop quantum gravity still has not produced any results. Meanwhile, Einstein's General relativity predicted that very dense concentrations of mass can distort space-time so much that even light cannot escape from it. We now call these objects «black holes» could photograph that surrounds these space monsters, and almost convinced that at the center of every massive galaxy is rotating supermassive black hole.

Mathematical equations of the General theory of relativity, proven again and again, are currently the most accurate method of prediction of gravitational interactions, replacing was developed by Isaac Newton a few centuries before.

Even more interesting articles about how the universe around us, read on . Subscription allows you to read articles that are not on the website.

But perhaps the biggest triumph of the General theory of relativity came in 2015, when they were discovered gravitational waves – ripples in space-time caused by the movement of very massive objects. The signal that the two black holes merged and merged, was a triumph of painstaking, patient work, done by an international team of researchers laboratories LIGO VIRGO. Read more about how the experts are looking for gravitational waves today, read Ilya Hel. Anyway, the development of a quantum-physical «version» the General theory of relativity remains a permanent goal of modern physics.


The most famous graveyard of ships in the world

The most famous graveyard of ships in the world

Sunken "Titanic" was found only many years after the disaster. For many centuries the world ocean was one of the main ways of communication of civilizations living on different continents. The seas and oceans sailed millions of ships that transported...

The neural network helped to answer the question of why we have dreams

The neural network helped to answer the question of why we have dreams

the Ability to dream is not at all, thus it is very important Our world is full of superstitions, and some of them are of particular interest. It is known, for example, that Michael Jordan wore University of N. Carolina shorts under his Chicago Bulls...

Found the first remains of a dinosaur that died from cancer

Found the first remains of a dinosaur that died from cancer

you May have seen centrosaurus in documentary films Millions of years ago in the canadian province of Alberta lived in a huge variety of dinosaurs. Especially many of centrosaurus (Centrosaurus apertus), which was a horned creature the size of a cow....

Comments (0)

This article has no comment, be the first!

Add comment

Related News

Large vegetables can save humanity from starvation

Large vegetables can save humanity from starvation

In different parts of the world regularly hosts competitions for the biggest vegetable. Tomatoes, which are considered to be the main ingredients of various salads and pizzas were first consumed in South America. In the wild they ...

The largest beetle in the world can knock you down

The largest beetle in the world can knock you down

Beetles-Goliath — real bullets If you ever have an opportunity to ride a motorcycle on the roads of Africa, be sure to wear a helmet. The fact that over the African lands actively fly the heaviest insects in the world — beetles-Go...

The hamsters were on the verge of extinction

The hamsters were on the verge of extinction

In nature, hamsters live for about 4 years. In the twentieth century, the ordinary hamsters (Cricetus cricetus) crowds ran through the steppes of Europe and Russia, being considered as agricultural pests. They were as different as...