New answers tagged causality
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The short answer to this question is that we do not know. The subject of your question is still in early "speculative", theorizing, and researching stages. I can say this because collisions of bubble universes under the eternal inflation theory just happens to be my specific area of work.
Non-colliding bubble universes (and the local potential minima in the ...
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If you take an aluminum rod and tap one end with a hammer, the disturbance travels along the rod at the speed of sound in aluminum, which is about 5000 m/s. This speed is what determines the frequency of the ringing that you hear. The speed is many orders of magnitude less than c. If it were higher than c for some other substance (one that was very stiff and ...
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About faster than light...
I know (in fact I am currently yet studying) different extensions of relativity. Some options naturally arise:
1) Yes, Ben... Sudarshan's (and Recami's) Meta-relativity is one "option", somewhat oldfashioned. Problems: tachyons have not been observed in Nature yet.
metarelativity paper
metarelativity paper 2012
2) Carlos ...
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Nice question.
I don't understand the Lorentz-violating possibilities very well, so I'll only try to comment on Lorentz-invariant theories.
The classic papers are Tolman 1917, Bilaniuk 1962, and Bilaniuk 1969. Bilaniuk 1969 can easily be found online by googling, and gives a good overview. Tolman proposed a causality paradox involving tachyons, known as ...
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There can be at least two different flavors of paradoxes. In one, a result such as 2+2=5 is proved, and the problem must be either incorrect reasoning or a set of assumptions that was invalid. In the other type, exemplified by the EPR paradox, the correct result of an argument is so surprising that it seems like it must be a mistake.
Based on the ...
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I put my negative comment in the from of the answer. Here are the very basics of the simultaneity implications (or causes) of relativity:
According to the special theory of relativity, it is impossible to say
in an absolute sense whether two distinct events occur at the same
time if those events are separated in space, such as a car crash in
London ...
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Physics has no official position on whether things are causes, laws are causes, or things and laws are causes. You need both (e.g. equation of motion and initial condition) in order to explain anything...
In the history of physics, the early days were still somewhat attuned to such questions. In the 20th century, the relationship of relativity and quantum ...
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