Information dynamics and new geometric foundations of quantum theory

Abstract: We discuss new approach to mathematical foundations of quantum theory, which is completely independent of Hilbert spaces and measure spaces. New kinematics is defined by non-linear geometry of spaces of integrals on abstract non-commutative algebras. New dynamics is defined by constrained maximisation of quantum relative entropy. We recover Hilbert space based approach (including unitary evolution and the von Neumann--L\"{u}ders rule) and measure theoretic approach to probability theory (including Bayes' rule) as special cases of our approach.