2 ms·
It's not a "speed limit of 0.1c for matter". This limit would apply to the scenario they investigated -- colliding black holes where the spacetime is massively
by gliptic 3y ago
It's not a "speed limit of 0.1c for matter". This limit would apply to the scenario they investigated -- colliding black holes where the spacetime is massively affected by the mass and movement of the black holes.
- borissk 3y agoAnd this extreme scenario is where probably any errors in GR can be observed, as quantum gravitational effects will become visible.
- bowsamic 3y agoNo, GR is expected to work fine in this regime since there is no expectation of any quantum effects. A quantum theory of gravity is only needed when we expect there to be significant quantum effects, for example maybe in a neutron star and definitely in situations where our measurement results depend on a superposition of "spacetimes". The reason we don't have a consensus on a quantum theory of gravity yet is that gravity is so weak that it's usually only detectable in situations that involve huge amounts of matter, and it's very rare to have huge amounts of matter together and still have the system behave in a way that requires quantum mechanics to describe it