The mathematical and conceptual foundations of physical reality — unified field theories, quantum gravity, and the structure of space-time.

Theoretical physics navigates the tension between mathematical elegance and empirical accountability. The pursuit of a "theory of everything" raises questions about whether comprehensiveness is achievable, and whether our categories of explanation are adequate to reality.

The Sufi tradition's concept of the Unity of Being (Wahdat al-Wujud) resonates with theoretical physics' search for unification. Al-Ghazali's critique of causal necessity — that observed regularities are habitual rather than logically necessary — anticipates modern discussions of emergence and underdetermination.