A Maximum Unit of Action for a Finite Universe

This paper explores the consequences of assuming a finite universe and proposes that global finiteness may require a fundamental upper bound on physical action. Modern physics recognises a foundational minimum through the Planck constant, yet no corresponding maximum is currently defined. The paper introduces the Helos constant as a conceptual maximum unit of action, defined algebraically through a scaling relation between the Planck scale and the cosmic limit. The framework is intentionally conceptual in scope and does not attempt a complete physical derivation. Instead, it examines whether a finite universe may naturally require global constraints absent from many current formulations, and whether such constraints may offer a useful perspective on infinities, entropy bounds, and large number relations in physical law.