Questions tagged [relativity-theory]

For questions regarding either the special or general theories of relativity.

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7
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1answer
431 views

What 19th century developments contributed to the General theory of Relativity?

Regarding General Theory of Relativity, I'm interested to find out whether there are some contributors to this theory in 19th century or not. In fact I want to know whether there are some physicists ...
19
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1answer
2k views

How was Einstein led to make a contact with Differential Geometry for his theory of General Relativity?

General Relativity was developed with Differential Geometry as the tool. How was Einstein led to make a contact with Differential Geometry for his theory of General Relativity? Who suggested him to ...
22
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2answers
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What attracted Einstein to the anomalous precession of Mercury?

The story is usually told starting with Einstein's 1915 paper Explanation of the Perihelion Motion of Mercury from General Relativity Theory, or at least its drafts from 1913-14. It was the first ...
14
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3answers
1k views

What was the motivation for Minkowski spacetime before special relativity?

If I understand correctly the concept of a Minkowski space/metric was already known before Einstein's paper on special relativity. Was there any physical motivation for studying this type of metric ...
6
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1answer
3k views

Why is Einstein's mass-energy relation usually written as $E=mc^2$, and not $\Delta E=\Delta m c^2$?

Why is Einstein's mass-energy relation usually written as $E=mc^2$, and not $\Delta E=\Delta m c^2$? When you calculate the energy $\Delta E$ released during nuclear fission, you take the difference ...
4
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2answers
289 views

What made Einstein believe (or know) that time was affected by speed and gravity?

How did he come up with this idea before there was any experimental data to prove this?
3
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1answer
95 views

Did Galileo state the principle of equivalence in full generality?

The weak equivalence principle (WEP) is often attributed to Galileo. Did Galileo ever state the WEP precisely? For instance as given here? The original principle, usually attributed to Galileo, ...
15
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2answers
1k views

What did Einstein contribute to Special Relativity that hadn't already been done by Lorentz in 1904 and Poincaré in 1905?

What did Einstein contribute to what is now called Special Relativity theory that hadn't already been done by Lorentz in his 1904 "Electromagnetic Phenomena in a System Moving with any Velocity ...
15
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3answers
1k views

When and why did the concept of relativistic mass become outdated?

While browsing on Physics Stack Exchange, I discovered numerous posts (these two are examples) which assert that relativistic mass is an outdated concept used in older textbooks. Looking through my ...
15
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1answer
767 views

What were the early empirical tests of Einstein's mass-energy equivalence $E=mc^2$?

Near the end of Einstein's 1905 paper on $E=mc^2$ he states (in the translation by Perrett and Jeffery): It is not impossible that with bodies whose energy-content is variable to a high degree (e.g....
14
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4answers
2k views

The motivation for relativity theory

I'm a high school student who never studied any relativity before, but I'm just wondering what was THE question that Einstein asked himself before going into this field. I knew he has done lots of ...
4
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1answer
3k views

An English copy of One Hundred Authors Against Einstein?

I've been trying to find the famous article, "One hundred authors against Einstein" (100 Autoren gegen Einstein), of various objections to special relativity, which is quite often referenced, but ...
9
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4answers
256 views

What was the longest delay between prediction and confirmation of a theory?

The recent announcement of the detection of gravitational waves by LIGO comes almost exactly 100 years after Einstein predicted gravitational waves in 1916. Are there other examples (in the era of ...
2
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2answers
305 views

Math development and under-appreciation of Maxwell's Equations

Freeman Dyson expresses the opinion in his 1972 essay titled "Missed Opportunities" that Maxwell's equations could have played a much bigger role, one that is comparable to classical mechanics, in ...