We must not conflate the physical world with its mathematical model in our physical theory.

On this year’s World Quantum Day, IQOQI Vienna once again opens its doors to the public.

We present a bundle geometric formulation of non-relativistic many-particles Quantum Mechanics (QM) where wave functions are seen as a cocyclic tensorial 0-form on configuration space-time seen as a principal bundle.

After reminding why relationality is the paradigmatic physical insight of General Relativistic theories, we discuss the bundle geometry of their field space.

Is gauge symmetry merely a redundancy in our description, or does it carry a deeper information-theoretic significance? Quantum error-correcting codes (QECCs) show that redundancy can serve as a resource for protecting information against noise.

Discussions of determinism and indeterminism of physical theories usually focus on properties of dynamical laws (e.g., uniqueness of solution). This is perfectly adequate in all the usual cases.