منابع مشابه
Varying G and Other Constants
We review recent progress in the study of varying constants and attempts to explain the observed values of the fundamental physical constants. We describe the variation of G in Newtonian and relativistic scalar-tensor gravity theories. We highlight the behaviour of the isotropic Friedmann solutions and consider some striking features of primordial black hole formation and evaporation if G varie...
متن کاملBrane-world cosmology and varying G
The rst ideas of a varying Newton's coupling G come from 1937, when P. A. M. Dirac introduced his famous Large Numbers Hypothesis [1, 2]. In the 60s, in an attempt to reconciliate Mach Principle with General Relativity (GR), Brans and Dicke developed their well known scalar-tensor theory of gravity [3]. Following Jordan's ideas, Brans and Dicke generalized GR including a varying G, whose dynami...
متن کاملThe Behaviour Of Cosmological Models With Varying-G
We provide a detailed analysis of Friedmann-Robertson-Walker universes in a wide range of scalar-tensor theories of gravity. We apply solution-generating methods to three parametrised classes of scalar-tensor theory which lead naturally to general relativity in the weak-field limit. We restrict the parameters which specify these theories by the requirements imposed by the weak-field tests of gr...
متن کاملCosmic Microwave Background Spectrum and G-varying Cosmology
argued that the data show deviations from a simple Here 11(t) is an epoch dependent factor which multiblack body curve. Fromthe point of view of the big plies the standard planckian spectrum. In the Dirac cosbang cosmology it is necessary that the MBR spectrum mologies this factor depends on G(t) and the gauge should show a strict planckian form. Any deviations function j~(t)discussed by Canuto...
متن کاملDark Matter, Time-varying G and the Dilaton
The value of the Jordan-Brans-Dicke coupling parameter ! is at present much more tightly bounded below by radar time delay experiments than it is by the predicted time variation of Newton's constant G. We point out the possibility of having a Jordan-Brans-Dicke-type scalar (i.e. a scale-free massless scalar eld or \dilaton") couple with diierent strengths to visible and to conjectured \dark" ma...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1979
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/188.4.829