Action principles in nature

Details Action principles in nature Action principles in nature

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.331...31b&link_type=abstract

Nature (ISSN 0028-0836), vol. 331, Jan. 7, 1988, p. 31-34. NSF-SERC-supported research.

Mathematics

2

Cosmology, Relativity, Space-Time Functions, Topology, Universe, Gravitation Theory, Lagrange Multipliers, Minkowski Space, Quantum Theory, Singularity (Mathematics)

Scientific paper

Physical theories have their most fundamental expression as action integrals. This suggests that the total action of the universe is the most fundamental physical quantity, and hence finite. In this article it is argued that finite universal action implies that the universe is spatially closed. Further, the possible spatial topologies, the types of matter that can dominate the early universe dynamics, and the form of any quadratic additions to the lagrangian of general relativity are constrained. Initial and final cosmological curvature singularities are required to avoid a universal action singularity.

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