Science — Emmef
How we know that Einstein's General Relativity can't be quite right
In the How we know that Einstein's General Relativity can't be quite right video, Sabine Hossenfelder explains how General relativity cannot be quite right. One claim in the video is that (general) relativity is wrong because relativity conflicts with quantum mechanics (QM) and QM is right. That is a bold claim for a falsifiable theory. A two-split thought experiment is provided to show this. This experiment – and to my knowledge no experiments so far – does not combine relativity and QM in such a way that we can rule out one of them. I do agree that theories with singularities, like relativity, generally suggest problems. Both theories, have shown to be reliable so far and naturally: both cannot be proven correct. I think that therefore, using one theory contradicting another cannot be used as proof that the other must be wrong.
Delayed Choice Quantum Eraser Experiment Explained
In the Delayed Choice Quantum Eraser Experiment Explained video, respect your intellect explains how the delayed choice quantum eraser (DCQE) experiment shows that causality can travel faster than light. I placed a comment where I suggested this was not necessarily a violation of causality according to relativity. This is also covered in a more elaborate article: “ Causality
Causality
Relativity states that causality travels with the speed of light. 1. Experiments like the delayed choice quantum eraser (DCQE) confirm that sometimes, causality happens instantaneously. 2 If the first measurement in the DCQE is interpreted as an event in the observers world line that affects the second measurement, we indeed observe a violation of causality. 3 From the perspective of the entangled photon pair (EPP) however, a causal ordering of events cannot be established: all events share the same spacetime interval. 4 All events – emission and two measurements – constitute the EPP's complete life and happen simultaneously in terms of causality. With this interpretation, there is no violation of causality at all.