Timeline for Discrete spacetime: what does it mean for spacetime fields and vacuum?
Current License: CC BY-SA 4.0
13 events
| when toggle format | what | by | license | comment | |
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| Aug 9, 2021 at 23:00 | comment | added | Anixx | This may be relevant: physics.stackexchange.com/questions/98152/… | |
| Jan 1, 2020 at 2:47 | vote | accept | riemannium | ||
| Dec 28, 2019 at 0:59 | history | edited | Prof. Legolasov |
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| Dec 28, 2019 at 0:52 | comment | added | Prof. Legolasov | @PM2Ring I tried writing an expanded answer on this, please take a look | |
| Dec 28, 2019 at 0:52 | answer | added | Prof. Legolasov | timeline score: 11 | |
| Dec 28, 2019 at 0:13 | comment | added | PM 2Ring | @Prof Ok, but LQG is using a more sophisticated structure than simple "bricks" of spacetime. And that's why I mentioned it in my initial comment... | |
| Dec 28, 2019 at 0:09 | comment | added | Prof. Legolasov | @PM2Ring just FYI Loop Quantum Gravity successfully reconciles "grainy" spacetime with Lorentz symmetry (it has its issues, but this part is solid). | |
| Dec 27, 2019 at 22:34 | history | edited | Qmechanic♦ | CC BY-SA 4.0 |
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| Dec 27, 2019 at 22:26 | comment | added | riemannium | Any quantization scheme at large distances, at short distances we know at some point the theory fails. Curiously, it also happens with the transition between quantum mechanics and the macroscopic world...Or perhaps we are wrong about some of our assumptions of the quantum/classical nature. | |
| Dec 27, 2019 at 22:24 | comment | added | PM 2Ring | Sure, you need more than plain old special relativity to answer this. You're asking about the quantum nature of spacetime itself, which is the core topic of quantum gravity. OTOH, although we can't say much with confidence about spacetime at the Planck scale, we do know that Lorentz applies very well in flat spacetime from the atomic scale to astronomical scales, so any quantization scheme for spacetime must preserve that. | |
| Dec 27, 2019 at 22:13 | comment | added | riemannium | Yes, but Lorentz Symmetry can NOT be the whole story. After all, we have supersymmetry, hypersymmetry, holography, dualities, and experimentally that Dark Matter and Dark Energy stuff we can not fit with Lorentz (known) SM fields. And, at the Planck scale, spacetime itself can not be merely Lorentzian...You have enough energy at those scales to make spacetime fluctuate in a way the topology and signature of spacetime (beyond the continuum thing) can not be constant... | |
| Dec 27, 2019 at 22:03 | comment | added | PM 2Ring | You should ask the Loop Quantum Gravity people. ;) A simple "grainy" spacetime is difficult to reconcile with Lorentz symmetry. | |
| Dec 27, 2019 at 21:39 | history | asked | riemannium | CC BY-SA 4.0 |