this model would account for acceleration without the need for dark energy. What am I missing?
***Didn’t dark matter theories arise before we knew that the universe was acceleratingly expanding?
Interesting conjecture.
Egad! It makes more sense that the “dark matter” theory.
Thanks! I’ll finishing watching this tomorrow; I only just got started.
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The tzimtzum or tsimtsum (Hebrew צמצום ṣimṣūm “contraction/constriction/condensation”) is a term used in the Lurianic Kabbalah to explain Isaac Luria’s doctrine that God began the process of creation by “contracting” his Ohr Ein Sof (infinite light) in order to allow for a “conceptual space” in which finite and seemingly independent realms could exist.
This primordial initial contraction, forming a ḥālāl happānuy “vacant space” (חלל הפנוי) into which new creative light could beam, is denoted by general reference to the tzimtzum. In Kabbalistic interpretation, tzimtzum gives rise to the paradox of simultaneous divine presence and absence within the vacuum and resultant Creation.
https://en.wikipedia.org/wiki/Tzimtzum
Uninteresting (to me) viewpoint...
“Compansion” or companion?
I hate shrinkage.
One man’s acceleration universe is another man’s contraction.
It’s not expansion or contraction, it’s “universal dimensional change”.
Happens to me after a swim in the cold stream not far from here.
I think it’s pretty obvious we exist in a computer simulation.
For all we do know, there is infinity more that we do not as cloudy specks in the universe, and in Time and Eternity. Only God is omniscient.
READ LATER.
“The universe’s expansion could reverse all at once, and we wouldn’t know that the outer universe was doing anything but expanding. With local shrinkage it seems to me that we would perceive that the universe’s expansion is accelerating.”
Not a bad theory!
Though the term “local shrinking” is a bit misleading because it implies something special about our neck of the wood or that the rest of the universe is not shrinking at this moment in time. Another name might be “accelerated expansion illusion” (due to observational time shift between near and distant objects.)
I like it much better than the so-far fictional “dark matter and “dark energy” theory.
Seems to me it should be relatively easy to prove or disprove it, by theoretically answering the question: “What would the universe look like if shrinkage has already started?” And then doing the observations to test those predictions.
We probably already have a lot of applicable observations - it’s just a matter of comparing them to what the “illusion” theory predicts.
Also if shrinkage has started, the must have been a point in time in the past when the universe stood momentarily still - just as it stopped expanding and before the start of the shrinkage. Is there an observational or theoretical way to determine when that occurred?
George Costanza knows all about the perils of “local shrinkage”... (Probably the funniest Seinfeld episode.)
https://www.youtube.com/watch?v=85MZ4c1EWkM
This whole body of speculation is based on the premise that light actually travels at a uniform velocity in all directions; which decided to be so by convention, not observation, which, some say is not possible to do.
Oops.