Nature's Metaphysics

Abstract

Abstract What are the laws of nature, and what explains their existence? This book develops the proposal that the laws of nature are grounded in the essences of properties. It is argued that fundamental natural properties have dispositional essences — they are potencies (pure powers). After explaining this proposal, the book goes on to show how this accounts for the existence of the laws of nature. A distinctive feature of this account is that it ensures that the laws of nature are metaphysically necessary. This account has advantages over the regularity and nomic necessitation accounts associated with Lewis and Armstrong, while the dispositional essentialist view of properties has corresponding advantages over the categoricalist view of properties, according to which properties are quidditistic and do not have qualitative essences, merely primitive identity and difference. The relationship between potencies and modality, and also intentionality is explored. Other potential criticisms are raised and the view defended against them. For example it is claimed that if all properties are potencies, then a vicious regress ensues; it is shown that this does not follow. Geometrical and other ‘structural’ properties are raised as counterexamples, being properties that seem categorical; it is argued that this is the case only if one takes a particular view of the role of spacetime in physical theories. It is held that laws are metaphysically contingent whereas dispositional essentialism makes them necessary; it is argued that the contingency of laws is an illusion. An account of laws is developed in the face of Mumford's claim that neither dispositional essentialism nor science has need of laws.