Tag Archives: relativity

The book of Albert Einstein: Relativity The Special and General Theory

Einstein (wikipedia commons)Now is time for the 100 anniversary of the publication of the paper written by Albert Einstein about General Theory of relativity.

We want to celebrate offering all of you for free other book wrote by Albert Einstein: Relativity, The Special and General Theory. Wrote to in 1916 and revised in 1924.


Special Relativity Theory And Black Holes

It is possible to find the relationship between the mass and the radius of a spherical black hole keeping in mind that the maximum speed that could reach an object, according to the theory of relativity, it is the speed of light.

The scape velocity in the surface of a spherical star will be the maximum velocity that could reach an object in order to stay in orbit around the star. This will happen when the kinetic energy of one object is equal to the potential energy due to the star gravitational attraction. Continue reading

Gravitational waves

LISA gravitational waves detectorIt is said that the gravitational waves are a consequence of the  theory of relativity, of   Albert Einstein, but it is difficult to find texts in which they argue why this relationship, except that they are arising from the study of the Einstein field equations. Let’s try to apply a little logic and some knowledge of relativity in this issue.

The key question is the following question: is possible to convey the effect of gravity faster than light?

Let’s assume for a moment that that is possible. For simplicity suppose that gravity affects instantaneously, or at infinite speed. That has a very important consequence, that is that you could create an experiment to transmit information instantaneously through instantaneous changes of gravitational effects. …more about gravitational waves