Existence of mind-independent physical reality
Ascertain whether a mind-independent physical reality exists, namely whether the rules governing the physical world are independent of observers’ perceptions and can, in principle, be discovered through successive approximations and empirical tests.
References
We do not know there is a physical reality to be found, of course.
— The physicists philosophy of physics
(2401.16506 - Peebles, 29 Jan 2024) in Section 3.3, Physical reality