On Fri, Jun 20, 2025 at 4:19 PM Alan Grayson <[email protected]> wrote:
*>>> **What Wheeler says is BS for the masses. Surprised you can't see it, > or the issue I have raised.* > > > *>> Are you also surprised that none of Wheeler's physicist colleagues can > see the "issue" you have raised either? What exactly is the "issue" by the > way? I thought you said the word "local" resolved your confusion.* > > > *> I changed my mind* > *You must've changed your mind and become re-confused just a few minutes ago. I wonder what your opinion will be a few minutes from now. * > *> when I realized that separate observers in different enclosures, with > different measuring devices, could reach different conclusions about > finding tidal forces,* > *If the enclosure was large enough, you would be able to detect tidal forces. **Do you really believe that Einstein and his colleagues weren't able to figure that out? It's also true that** the tidal force near a supermassive black hole would be very low, title forces wouldn't be strong enough to start tearing your body apart until after you have passed the event horizon.* *>I have no idea what Wheeler's colleagues think about this issue, nor does > it really matter.* > *Because you know far more about General Relativity than all the professors who have spent their entire careers studying it?* > * > **I think it leaves a lot of unresolved issues to claim that geometry > alone xplains motion for free falling objects, without specifying exactly > how geometry interacts with material objects.* > *But Einstein's field equation of General Relativity does exactly that! The equation is: * *G_μν = (8πG/c⁴)T_μν* *Left of the equal sign is the Einstein Tensor which describes the shape of spacetime which is geometry. And right of the equal sign is the Stress-Energy Tensor which describes the matter density, the energy density, the pressure, the stress, the tension. and the momentum flux; which are all material things. And "specifying exactly how geometry interacts with material objects" is what you asked for!* *If I had to summarize what that equation is saying in just 12 words I would say "Matter tells spacetime how to curve. Spacetime tells matter how to move". * * > **At the end of the day, you seem to support the "shut up and > calculate" school of thought, or philosophy. AG* > *Speaking of philosophy, can you tell me of one new philosophical problem that General Relativity introduced that Newtonian physics didn't already have? I can't think of one. * *John K Clark See what's on my new list at Extropolis <https://groups.google.com/g/extropolis>* efq > > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/everything-list/CAJPayv0gTt-XuZgkwKzuwDHQEkAJME_CixZ2iZ7P%2Bmw1oneLqA%40mail.gmail.com.
