STABLE CLOCKS AND GENERAL RELATIVITY

Details STABLE CLOCKS AND GENERAL RELATIVITY STABLE CLOCKS AND GENERAL RELATIVITY

1995-04-12

arxiv.org/abs/gr-qc/9504017v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages Plain TeX and 1 postscript figure. Direct all correspondence to cmw@howdy.wustl.edu, FAX 314-935-6219

Scientific paper

We survey the role of stable clocks in general relativity. Clock comparisons have provided important tests of the Einstein Equivalence Principle, which underlies metric gravity. These include tests of the isotropy of clock comparisons (verification of local Lorentz invariance) and tests of the homogeneity of clock comparisons (verification of local position invariance). Comparisons of atomic clocks with gravitational clocks test the Strong Equivalence Principle by bounding cosmological variations in Newton's constant. Stable clocks also play a role in the search for gravitational radiation: comparision of atomic clocks with the binary pulsar's orbital clock has verified gravitational-wave damping, and phase-sensitive detection of waves from inspiralling compact binaries using laser interferometric gravitational observatories will facilitate extraction of useful source information from the data. Stable clocks together with general relativity have found important practical applications in navigational systems such as GPS.

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