In current quantum field theory, causality is typically defined by the vanishing of field commutators for spacelike separations. Two researchers at the University of Massachusetts and Universidade ...

There are contradictions that arise if causal finite temperature quantum field theory is misappropriated to acausal spacelike black holes: In a commonly cited reference, Hawking did this exact ...

[2] On the Growing Universe of Causal Set Theory—An Order-Type Approach. Foundations of Physics (2024). [3] Towards a quantum field theory description of nonlocal spacetime defects.

According to Zych, research on indefinite causal structures is helping with the search for the full theory of quantum gravity in two ways: by providing a mathematical framework, and by informing ...

This means that the causal order of A and B cannot be always be distinguished by a quantum particle such as a photon. In their experiment, Romero, Costa and colleagues created a “quantum switch”, in ...

Physics How indefinite causality could lead us to a theory of quantum gravity Experiments show that effect doesn’t always follow cause in the weird world of subatomic particles, offering fresh ...