Roguelike Updated 2025-07-16
Personal life of Richard Feynman Updated 2025-07-16
Richard Feynman's first seminar in 1941 Updated 2025-07-16
He and John Archibald Wheeler presented the Wheeler-Feynman absorber theory.
Quote by Richard Feynman Updated 2025-07-16
Work by Richard Feynman Updated 2025-07-16
Works about Richard Feynman Updated 2025-07-16
Rich person Updated 2025-07-16
Rich family Updated 2025-07-16
Asthma Updated 2025-07-16
Tuberculosis Updated 2025-07-16
Potentiometer Updated 2025-08-08
Electrical resistance Updated 2025-07-27
Irreducible representation Updated 2025-07-16
Schur's lemma Updated 2025-07-16
Special relativity Updated 2025-07-16
Explains how it is possible that everyone observes the same speed of light, even if they are moving towards or opposite to the light!!!
This was first best observed by the Michelson-Morley experiment, which uses the movement of the Earth at different times of the year to try and detect differences in the speed of light.
This leads leads to the following conclusions:
- to length contraction and time dilation
- the speed of light is the maximum speed anything can reach
The "special" in the name refers to the fact that it is a superset of general relativity, which also explains gravity in a single framework.
Since time and space get all messed up together, you have to be very careful to understand what it means to say "I observed this to happen over there at that time", otherwise you will go crazy. A good way to think about is this:
- use Einstein synchronization to setup a bunch of clocks for every position in your frame of reference
- on every point of space, you put a little detector which records events and the time of the event
- each detector can only detect events locally, i.e. events that happen very close to the detector
- then, after the event, the detectors can send a signal to you, who is sitting at the origin, telling you what they detected
General relativity Updated 2025-07-16
Unifies both special relativity and gravity.
Not compatible with the Standard Model, and the 2020 unification attempts are called theory of everything.
One of the main motivations for it was likely having forces not be instantaneous, but rather mediated by field to maintain the principle of locality, just like electromagnetism did earlier.
Regular convex polygon Updated 2025-07-16
Tesseract Updated 2025-07-16
First principle Updated 2025-07-16
Emergence Updated 2025-07-16
Basically the opposite of reductionism.
Figure "xkcd 435: Fields arranged by purity" must again be cited.
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