The theory of relativity shows that time is not a constant, but a relative measurement to the observer. For example, it’s long been established that clocks running further away from the Earth’s gravity run slightly slower than those on the surface when they are compared.
See also:
- I read about this in A Brief History of Time (although I already know GPS clocks have to adjust for this)
- Time is relative but it can also break the law of conservation of energy: time crystals break time-translation symmetry
Links to this note
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An Anti-Universe Could Explain Dark Matter
One of the issues with the big bang theory and observations of the cosmos is that there ought to be more stuff. The presence of dark matter must be there because we can measure its effects via gravitational waves. A possible explanation for why dark matter exists at all is that there is an anti-universe—the same as “our” universe but with neutrinos spinning the opposite way and time going backwards. If that’s true, it would be expanding in the opposite direction as the big bang.