On the Evolution of Cosmological Type Ia Supernovae and the Gravitational Constant

摘要: There are at least three ways in which a varying gravitational constant $G$ could affect the interpretation of recent high-redhisft Type Ia supernovae results. If local value space-time location distant is different, it would change both thermonuclear energy release and time scale supernova outburst. In cases effect related to Chandrasekhar mass $M_{\rm Ch}\propto G^{-3/2}$. Moreover integrated variation with also cosmic evolution therefore luminosity distance relation. Here we investigate consistent way how these different effects current Hubble diagram supernovae. We parametrize using scalar-tensor theories gravity, such as Jordan-Brans-Dicke theory or its extensions. It remarkable that Dirac's hypothesis should decrease can qualitatively explain observed $\Delta m \simeq 0.2$ mag $z\simeq 0.5$ (with respect decelerating universe) and, same time, reduce duration risetimes recently reported.