On Sunday, January 20, 2019 at 9:14:39 AM UTC-6, Lawrence Crowell wrote: > > On Saturday, January 19, 2019 at 5:42:12 AM UTC-6, agrays...@gmail.com > wrote: >> >> Since it seems conceptually impossible to model a theory with DISJOINT >> discrete spatial units, thus requiring the units to be juxtaposed, do such >> theories acknowledge difficulty of motion between the units, which might or >> might not have boundaries? TIA, AG >> > > I am not sure how to impress people with how bad this thinking is. These > slice and diced chunks of spacetime, whether voxels, plaquettes and so > forth have violations of Lorentz symmetry of spacetime. This means that > curiously the symmetry of gravitation would be violated at higher energy, > and in fact where it is quantized. These ideas have further been falsified > by the lack of dispersion from distant sources. These ideas are bad > interpretations of the Planck length. The Planck length is just the > smallest length beyond which you can isolate a quantum bit. Remember, it is > the length at which the Compton wavelength of a black hole equals its > Schwarzschild radius. It is a bit similar to the Nyquist frequency in > engineering. In order to measure the frequency of a rotating system you > must take pictures that are at least double that frequency. Similarly to > measure the frequency of an EM wave you need to have a wave with Fourier > modes that are 2 or more times the frequency you want to measure. The black > hole is in a sense a fundamental cut-off in the time scale, or in a > reciprocal manner the energy, one can sample space to find qubits. > > The levels of confusion over this are enormous. It does not tell us that > spacetime is somehow sliced and diced into briquets or pieces. It does not > tell us that quantum energy of some fields can't be far larger than the > Planck energy, or equivalently the wavelength much smaller. This would be > analogous to a resonance state, and there is no reason there can't be such > a thing in quantum gravity. The Planck scale would suggest this sort of > state may decay into a sub-Planckian energy. Further, it is plausible that > quantum gravity beyond what appears as a linearized weak field > approximation similar to the QED of photon bunched pairs may only exist at > most an order of magnitude larger than the Planck scale anyway. A > holographic screen is then a sort of beam splitter at the quantum-classical > divide. > > LC >
Where is the "inconsistency" in the article *Space and Time in* *Loop Quantum Gravity* Carlo Rovelli https://arxiv.org/abs/1802.02382 Replacing spacetime with spinfoam still has some spin cycles left. - pt -- 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 everything-list+unsubscr...@googlegroups.com. To post to this group, send email to firstname.lastname@example.org. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.