During the 19th century, the electromagnetic theory of Maxwell assumed that electromagnetic waves travelled in a medium called ether. The Michelson-Morley experiment was an experiment devoted to detect the ether. We can think about the electromagnetic waves like an analogue … Continue reading

# Category Archives: Relativity

Imagine the S’-frame moves at constant velocity (see the frames above this line): relative to the S-frame. In the S’-frame an object moves with acceleration QUESTION: What is the acceleration in the S-frame? Of course it has to be something … Continue reading

In our daily experience, we live in a “non-relativistic” world with a very high degree of accuracy. Thus, if you see a train departing from you ( you are at rest relative to it) with speed (in the positive direction … Continue reading

Other striking consequence of Lorentz transformations and then, of the special theory of relativity arises when explore the concept of simultaneity. Accordingly to the postulates of relativity, and the structure of Lorentz transformations we can understand the following statement: What … Continue reading

Once we introduce the postulates of special relativity and we have deduced the generalization of galilean transformations for electromagnetism and mechanics, the Lorentz transformation. We can deduce some interesting results. Suppose we have two events and , whose coordinates of … Continue reading

Suppose two events happening in the S’-frame at the same point at different times. and . What is the temporal separation in the S-frame? According to Lorentz transformations, it is: or equivalently i.e. Of course, in the parallel case, if … Continue reading

These equations define the most general (direct) Lorentz transformations and we see they are not those in the previous post! I mean, they are not the one with the relative velocity in the direction of one particular axis, as we … Continue reading

For physicists working with objects approaching the light speed, e.g., handling with electromagnetic waves, the use of special relativity is essential. The special theory of relativity is based on two single postulates: 1st) Covariance or invariance of all the physical … Continue reading