Large numbers and ratios in astrophysics and cosmology

Details Large numbers and ratios in astrophysics and cosmology Large numbers and ratios in astrophysics and cosmology

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983rspta.310..311r&link_type=abstract

(Royal Society, Discussion on the Constants of Physics, London, England, May 25, 26, 1983) Royal Society (London), Philosophical

Astronomy and Astrophysics

Astrophysics

7

Astrophysics, Constants, Cosmology, Baryons, Big Bang Cosmology, Galactic Evolution, Hubble Constant, Neutrinos, Nuclear Fusion, Photons

Scientific paper

The masses and lifetimes of stars can be expressed in terms of fundamental constants. Such expressions always involve powers of the number hc/Gmp2, whose huge magnitude stems from the weakness of gravity on microphysical scales. Our physical understanding of what determines galactic dimensions is not yet, however, on the same firm footing. Observational cosmology gives us three basic numbers that characterize our Universe; (1) the Robertson-Walker curvature radius; (2) the baryon-to-photon ratio; (3) the amplitude of the initial metric fluctuations which triggered galaxy formation. It is uncertain how (or, indeed, whether) these cosmological numbers can be derived from known physics.

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