The origin of the difference between space and time

Details The origin of the difference between space and time The origin of the difference between space and time

1999-01-15

arxiv.org/abs/gr-qc/9901045v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

22 pages, latex

Scientific paper

All differences between the role of space and time in nature are explained by proposing the principles in which none of the space-time coordinates has an {\it a priori} special role. Spacetime is treated as a nondynamical manifold, with a fixed global ${\bf R}^D$ topology. Dynamical theory of gravity determines only the metric tensor on a fixed manifold. All dynamics is treated as a Cauchy problem, so it {\em follows} that one coordinate takes a special role. It is proposed that {\em any} boundary condition that is finite everywhere leads to a solution which is also finite everywhere. This explains the $(1,D-1)$ signature of the metric, the boundedness of energy from below, the absence of tachyons, and other related properties of nature. The time arrow is explained by proposing that the boundary condition should be ordered. The quantization is considered as a boundary condition for field operators. Only the physical degrees of freedom are quantized.

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