Precision Clocks in Space and α-Variations

Details Precision Clocks in Space and α-Variations Precision Clocks in Space and α-Variations

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004nuphs.134..163q&link_type=abstract

Nuclear Physics B Proceedings Supplements, Volume 134, p. 163-170.

Physics

Nuclear Physics

Scientific paper

Important developments both in theoretical and observational cosmology have fueled considerable interest in searches for variations of the fine structure constant. Experimentally, Webb et al have found evidence for a cosmological variation of the fine structure constant through an analysis of the absorption lines in galactic halos from quasar-emitted light. Recently developed small ion atomic clocks enable Solar System tests for equivalence principle (EP) violating α-variations by way of rate-comparisons of three ultra-stable atomic clocks near-to and far-from the sun where gravitational red-shift changes are more than 104 larger than in low Earth orbit. No space tests of the EP have been made in nearly 30 years, since the GP-A hydrogen maser reached a 10,000 km apogee confirming EP red-shift predictions to 1 part in 104. Today's small ion clocks, nearly 100× more stable and 100× smaller than the GP-A H-maser, could probe for EP violating scalar fields near the sun for mission costs comparable to low Earth orbiters and improve the GP-A sensitivity by 5 to 6 orders of magnitude.

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