Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-08
Astronomy and Astrophysics
Astrophysics
Invited talk given at the International Conference "Frontiers of Fundamental Physics 6", held in Udine, Italy, September 26 -
Scientific paper
Astronomers measure distances to faraway galaxies and their velocities. They do that in order to determine the expansion rate of the Universe. In Part I of these lectures the foundations of the theory of the expansion of the Universe was given. In this part we present the theory. A formula for the distance of the galaxy in terms of its velocity is given. It is very simple: $r(v)=c\tau/\beta\sinh\beta v/c$, where $\tau$ is the Big Bang time, $\beta =\sqrt{1-\Omega_m}$, and $\Omega_m$ is the mass density of the Universe. For $\Omega_m<1$ this formula clearly indicates that the Universe is expanding with acceleration, as experiments clearly show.
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