Weyl's principle, cosmic time and quantum fundamentalism

Details Weyl's principle, cosmic time and quantum fundamentalism Weyl's principle, cosmic time and quantum fundamentalism

2010-06-30

arxiv.org/abs/1006.5848v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

To appear in the section on "Physical and philosophical perspectives on probability and time" in S. Hartmann et al. (eds.) "Ex

Scientific paper

We examine the necessary physical underpinnings for setting up the cosmological standard model with a global cosmic time parameter. In particular, we discuss the role of Weyl's principle which asserts that cosmic matter moves according to certain regularity requirements. After a brief historical introduction to Weyl's principle we argue that although the principle is often not explicitly mentioned in modern standard texts on cosmology, it is implicitly assumed and is, in fact, necessary for a physically well-defined notion of cosmic time. We finally point out that Weyl's principle might be in conflict with the wide-spread idea that the universe at some very early stage can be described exclusively in terms of quantum theory.

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