Variations of the Cosmic Expansion Field and the Value of the Hubble Constant
Tammann, G. A.
Original · EN
Four Hubble diagrams are combined to test for the linearity of the cosmic expansion field. The expansion rate, H₀, is found to decrease by 5% out to 18000km/s. Beyond this distance the mean value of H₀ is close to the value at 10000km/s. The absolute value of H₀ is derived in two different ways. The one leads through Cepheids from HST and blue SNe Ia to H₀=57+/-7 (external error) at 30000km/s. The other uses various distance indicators to the Virgo cluster whose distance can be extended to 10000km/s by means of only relative cluster distances; the result of H₀ is closely the same. Independent distances from purely physical methods (SZ effect, gravitational lenses, and MBW fluctuations) cluster about H₀(cosmic)=58.
English translation
This paper has no Arabic translation yet. Be the first: it takes a few seconds, and the result is stored for every future reader.