3 ms·
In most cases, only one of them maters and the other is negligible: at very small scales QM rules, while at very large scales only GR is important. But in speci
by yiyus 7y ago
In most cases, only one of them maters and the other is negligible: at very small scales QM rules, while at very large scales only GR is important. But in special situations, such as black holes and big bangs, nothing can be neglected and there is no boundary. (AFAIU, IANAP)
- irrational 7y agoWhat about in between small and large scales? Medium scales? Is there an in-between?
- yiyus 7y agoYes, there is an in-between at which Newton laws hold. Too big for QM and too small for GR to make a difference. Fortunately, this is the scale in which we live.
- klank 7y agoSmall point of clarification, the predictions of newtonian laws are a limit in GR. So, technically speaking, newtonian physics is still following GR for that energy regime.
- irrational 7y agoSo, QM at the small scale and GR everywhere else? Where is the line between QM and GR? Atomic level? Quark level?
- beojan 7y agoQM has a classical limit too. At human scales, both QM and GR are at (very close to) their respective classical limits.
- deleted 7y ago[deleted]