Physics – Atomic Physics
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..551...86f&link_type=abstract
ATOMIC PHYSICS 17: XVII International Conference on Atomic Physics; ICAP 2000. AIP Conference Proceedings, Volume 551, pp. 86-9
Physics
Atomic Physics
Determination Of Fundamental Constants, Atomic Spectra, Intergalactic Matter, Quasar Absorption And Emission-Line Systems, Lyman Forest
Scientific paper
Theories unifying gravity and other interactions predict spatial and temporal variation of physical ``constants'' in the Universe. Comparison of quasar absorption line spectra with laboratory spectra provide the best probe for variability of the fine structure constant, α=e2/ℏc, over cosmological time-scales. We have demonstrated [1] that high sensitivity to the variation of α can be obtained from a comparison of the spectra of heavy and light atoms and have obtained an order of magnitude gain in precision over previous methods [2]. Our new constraints [3] on α come from simultaneous fitting of numerous absorption lines of the following species: MgI, MgII, AlII, AlIII, SiII, CrII, FeII, NiII and ZnII. The results are based on an analysis of 49 absorption systems covering cosmological time starting from about 10% of the age of the Universe after Big Bang (the redshift parameters cover 0.5
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