quantum

“Saying that matter interactions all come from the metric of classical spacetime means, at least naïvely, that quantum spacetime — whatever that means empirically — does not really have any role, or that the foundational questions in quantum theory are simply irrelevant in quantum theory of gravity and matter,” Minic said.

Matter is quantum as we know, and if matter comes from the spacetime metric then, what happens to the observed distinction between quantum and classical correlations - for example quantum probabilities interfere, classical do not.”

“Now, the authors say that spacetime coordinates are matrices, but what does that mean for the experimentally tested Standard Model whose quantum fields live in classical spacetime?”

While the authors argue that spacetime coordinates are matrices, Minic said “I do not see any deep consequences of that statement! What happens to quantum correlations in that matrix valued spacetime? Do they satisfy the quantum Bell bound? How is the quantum probability computed? Is the Born rule still valid? Are there any new testable predictions?”

The Born rule bridges the math of quantum theory to the outcomes of experiments, which makes the field a legitimate scientific discipline in the first place.