Ricardo -> RE: Black Hole eats sun (May 30 2019 13:50:32)
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ORIGINAL: BarkellWH Today, 29 May 2019, marks the one hundredth anniversary of the solar eclipse that provided direct evidence of Einstein's theory of gravity laid out in his General Theory of Relativity. It confirmed that gravity was not a force acting independently across a passive space, but was a function of the warp and curvature of space-time itself. Walter Isaacson, in his biography of Einstein, recounts an exchange between Einstein and a graduate student, Ilse Schneider, when news came that the theory had been confirmed. Schneider recalled later that at the time she asked Einstein what he would have thought if the eclipse observation had contradicted his theory. Einstein replied, "Then I would have been sorry for the dear Lord, because the theory is correct." Bill I often come across the topic of grand unification.... referring to running the cosmic movie backward in time such that in the earliest moments after the Big Bang event, the 4 known “forces” recouple together and appear to be a single force. This apparently works neatly for strong nuclear force, the weak force, and the electromagnetic force....but the comparative weakness of gravity makes it stand off from the others. Theorists looking for clues focus on the need for forces to use bosons to exchange force info between locations (gluons for atomic nucleus, W and Z for weak interaction, photons for electromagnetism), so they hope that a discovery of a ”graviton particle”, might lead us toward unification if the thing can fit into the standard model framework. But it always confused me why they need to do this at all if GR reveals gravity to be a curvature of space response to presence of massive objects, rather than a “force”. If the sun disappeared magically, spacetime snaps back flat with a wave that propagates at the speed of light, no need or even time for gravitons to be exchanged in some way to make this happen. Earth orbit changes instantly as we see the sun blink out 8 minutes after the last emitted photon reaches us because the gravity wave hits us at the same precise moment So unless I am miss understanding the supposed graviton interaction (I am sure I am), I don’t see a point to trying to unify gravity at all. If anybody could explain it clearly that would be great! Meanwhile I believe the dark matter problem and this unification problem to be directly related (the reason both are elusive is due to the same misunderstanding about GR).
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