Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-08-08
Astronomy and Astrophysics
Astrophysics
12 pages, 10 figures, accepted to Astrophysics and Space Science
Scientific paper
10.1007/s10509-008-9878-4
Motivated by the possibility that the fundamental ``constants'' of nature could vary with time, this paper considers the long term evolution of white dwarf stars under the combined action of proton decay and variations in the gravitational constant. White dwarfs are thus used as a theoretical laboratory to study the effects of possible time variations, especially their implications for the future history of the universe. More specifically, we consider the gravitational constant $G$ to vary according to the parametric relation $G = G_0 (1 + t/t_\ast)^{-p}$, where the time scale $t_\ast$ is the same order as the proton lifetime. We then study the long term fate and evolution of white dwarf stars. This treatment begins when proton decay dominates the stellar luminosity, and ends when the star becomes optically thin to its internal radiation.
Adams Fred C.
Ketchum Jacob A.
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