HarryNussbaumer: Expanding Universe Conference (http://www.lowell.edu/workshops/slipher)

Title: Slipher's redshifts as support for de Sitter's universe?

Abstract: Modern cosmology began in 1917 with Einstein and de Sitter. For the first few
years it was mainly a matter for the theoreticians with, however, Slipher's
redshifts as strong support for de Sitter. Eddington's book on general
relativity, published in 1923, got the observers going: in 1924/25 Wirtz,
Silberstein, Lundmark and Strömgren were inspired be de Sitter's redshift
prediction; also Hubble in 1929 referred to de Sitter. In 1925 Lemaître found
the snare in de Sitter's theory; it violated the principle of homogeneity.
In 1927 he developed his theory of the dynamical universe, with the linear
velocity-distance relationship v=Hr. Based on Slipher's nebular redshifts and
Hubble's distances he showed the universe to be expanding, and calculated the
coefficient H. With Lemaître's work Slipher's redshifts were given a completely
different meaning to what they had in de Sitter's theory.

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