# Questions tagged [special-relativity]

The special theory of relativity describes the motion and dynamics of objects moving at significant fractions of the speed of light.

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### How are the time dilation and the relativistic Doppler shift added together in what observers “see”?

I'm using the illustration from this question: Suppose A and B are d light years away, and at rest. Then they symmetrically start to travel toward each other (symmetric acceleration process in ...
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### If an object is travelling near light speed, would it's actions seem to be in slow motion?

Hypothetically if we were observing a clock travelling near light speed relative to us, we would see the clock ticking at a much slower speed than us. If that is true, then would all actions that are ...
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### Why isn't time contraction a thing?

I'm very naive about relativity, but if it could be possible that Alice ages less than Bob in a journey, doesn't it logically follow that from the point of view of Alice, Bob has, at some point, gone ...
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### How does one's view of the universe change as one approaches the speed of light?

I found an interesting and fun question at worldbuilding.stackexchange.com , that to my surprise, I don't find that easy to answer. I would like to quote here that question , but with a small ...
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### Nature of Experiment or Measurement tied to Special Relativity concepts

Premise: In special relativity, we come across concepts like Length Contraction and Time Dilation. Pertaining to these topics, I have come across the following diagram (or its slight variations) in ...
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### A beginner's question on time dilation

I have just started understanding relativity so the question might look absurd. I know that the faster we move through space , the slower we move through time. But I haven't understood it fully. I ...
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### Origin of the energy distribution of synchrotron radiation

Is there an easy explanation why synchrotron radiation from a bending magnet (e.g. in an electron storage ring) has an energy distribution? In other words, given a specific magnet with a defined ...
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### Do synchronized clocks retain the same time delta between two inertial frames? [closed]

Let's say we have a device made of a succession of clocks (red squares in the scheme) which are synchronised, in the device inertial reference frame, using Einstein synchronisation. Each clock is ...
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### Separating the topics of general and special relativity

So, I have managed to confuse myself beyond the point of repair. I am not a physics student, so my physical knowledge is limited. Anyway, there are a few topics of relativity, which I can not seem to ...
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### Write electromagnetic field tensor in terms of four-vector potential

How can we know that the electromagnetic tensor $F_{\mu\nu}$ can be written in terms of a four-vector potential $A_{\mu}$ as $F_{\mu \nu} = \partial_{\mu} A_{\nu} - \partial_{\nu} A_{\mu}$? In the ...
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### A book for relativistic quantum mechanics

What is the best book to learn relativistic quantum mechanics at first time? I would like a book that also talk about the representations of the Lorentz group and the Poincaré group.
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### Is it possible to derive $2\times 2$ Lorentz transformation matrix from only eigenvectors?

As a preface, I am somewhat familiar with year 1 linear algebra but not too familiar with how one makes the connection to Lorentz transformation matrices so I apologize if the answer is obvious. One ...