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Not the time it takes light to reach the observer. The actual rate of time outside a black hole with respect to inside it.
I know relative to the object, time will feel linear. But if relative outside the black hole it will never reach the center, and in the same relative plane the black hole dies, wouldn't this be a paradox?
To understand the main equation of General Relativity (Einstein Field equation) and the role of the cosmological constant, no need to spend the huge time that is usually assumed following the tedious calculations of usual GR textbooks. By focusing on the particular case of the universal expansion it is possible to directly justify from scratch its main law, that is the Friedmann equations, particular case containing the essentially same mathematical articulation as the Einstein field equation, giving a genuine understanding of it in much simpler mathematical formalism. Here it is : Expansion of the Universe in General Relativity
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As far as we've catalogued the universe, taking into account expansion and motion and zeroing that out, is there a spectrum of radiation that corresponds to all possible physical phenomena humanity thus far knows of? That if something were detected or observed outside this range it would be considered arising of unnatural origins and possibly extra-universal?
Could such frequencies be detected with current technology? What if there were some mysterious electromagnetism at a wavelength comparable the observable universe for instance?