ar X iv : g r - qc / 0 21 00 04 v 1 2 O ct 2 00 2 TIME DEPENDENCE OF BRANS - DICKE PARAMETER ω FOR AN EXPANDING UNIVERSE

نویسندگان

  • B. K. Sahoo
  • L. P. Singh
چکیده

We have studied the time dependence of ω for an expanding universe in the generalised B-D theory and have obtained its explicit dependence on the nature of matter contained in the universe in different era.Lastly, we discuss how the observed accelerated expansion of the present universe can be accomodated in the formalism.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

ar X iv : g r - qc / 0 21 10 38 v 1 1 2 N ov 2 00 2 COSMIC EVOLUTION IN GENERALISED BRANS - DICKE THEORY

We have studied the Generalised Brans-Dicke theory and obtained exact solutions of a(t),φ(t), and ω(t) for different epochs of the cosmic evolution. We discuss how inflation,decceleration,cosmic acceleration can result from this solution.The time variation of G(t) is also examined .

متن کامل

ar X iv : g r - qc / 0 40 10 64 v 1 1 5 Ja n 20 04 GRAVITATIONAL WAVES IN GENERALISED BRANS - DICKE THEORY

We have solved Cosmological Gravitational Wave(GW) equation in the frame work of Gen-eralised Brans-Dicke(GBD) theory for all epochs of the Universe.The solutions are expresed in terms of the present value of the Brans-Dicke coupling parameter ω(φ).It is seen that the solutions represent travelling growing modes for negative values of ω 0 for all epochs of the Universe.

متن کامل

ar X iv : g r - qc / 0 50 41 05 v 1 2 1 A pr 2 00 5 An stellar explosion in the weak field approximation of the Brans - Dicke theory

We treat a very crude model of an exploding star, in the weak field approximation of the Brans-Dicke theory, that shows aspects that resembles some characteristics data of a Type Ia Supernova. The most noticeable result in the electromagnetic component, is the relationship between the absolute magnitude at maximum brightness of the star and the decline rate in one magnitude from that maximum. T...

متن کامل

ar X iv : g r - qc / 0 41 10 66 v 1 1 4 N ov 2 00 4 5 - dimensional Brans - Dicke Theory and Cosmic Acceleration

We consider a 5-dimensional scalar-tensor theory which is a direct generalization of the original 4-dimensional Brans-Dicke theory to 5-dimensions. By assuming that there is a hypersurface-orthogonal spacelike Killing vector field in the underlying 5-dimensional spacetime, the theory is reduced to a 4-dimensional theory where the 4-metric is coupled with two scalar fields. The cosmological impl...

متن کامل

ar X iv : g r - qc / 9 90 10 59 v 2 2 4 Ja n 19 99 Phases of the Brans - Dicke Cosmology with Matter

We study the cosmology of the Brans-Dicke theory with perfect fluid type matter. In our previous work, we found exact solutions for any Brans-Dicke parameter ω and for general parameter γ of equation of state. In this paper we further study the cosmology of these solutions by analyzing them according to their asymptotic behaviors. The cosmology is classified into 19 phases according to the valu...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2002