Physical Domain

The Physical Domain is the physical part of a universe: its Pulse Domain less the Nullcore, the null region at its centre. The Null-Well Interior Conditions say what the null means in a real universe: the field is extinguished on the null region N(t) and stays finite at its edge. Every physical state, light, matter and the ripples of space alike, is defined only in the Physical Domain, so none can enter the null, and N(t) is excluded from the domain rather than given properties of its own; only data crosses it, by the Pulsecore's operation at its boundary. Formally, ⥂◉_phys = ⥂◉ ∖ N(t), where ⥂◉ is the Pulse Domain, N(t) the null region, the Nullcore, and ∖ the set difference. It connects to Pulse Domain, Nullcore, Null-Well Interior, Dirichlet Nulling and Resonant Return.