Possible direct measurement of the expansion rate of the universe

Details Possible direct measurement of the expansion rate of the universe Possible direct measurement of the expansion rate of the universe

2010-01-22

arxiv.org/abs/1001.3975v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 2 figures; added more discussions

Scientific paper

A new method is proposed for directly measuring the expansion rate of the universe through very precise measurement of the flux of extremely stable sources. The method is based on the definition of the luminosity distance and its change along the time due to cosmic expansion. It is argued that galaxies may be chosen as the targets of the observation to perform such measurements. Once the required precision of the flux is achieved, profiting from the abundance of galaxies in the universe, the method could be quite promising.

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