If gravity plays a role in wave function collapse that will pose serious questions for the Church-Turing hypothesis. It might very well make it impossible for non-Quantum computers to accurately model quantum gravity.
Penrose does not argue for "something computationally more powerful than objective collapse" rather, he argues that the physical Church-Turing thesis is false due to quantum gravity. Something he is an expert on, btw.
Penrose does not argue for "something computationally more powerful than objective collapse" rather, he argues that the physical Church-Turing thesis is false due to quantum gravity. Something he is an expert on, btw.