In this work we study an alternative scheme for an emergent universe scenario in the context of a jordan brans dicke theory, where the universe is initially in a truly static state supported by a scalar field located in a false vacuum. Signchangeable holographic dark energy in brans dicke theory. Brans dicke is actually the theory that will concern us here. This is the action of brans dicke theory, which is obviously a subcase of scalartensor theories.
Critical behavior in the brans dicke theory of gravitation critical behavior in the brans dicke theory. This is primarily an historical survey of the origins and evolution of only one of a variety of many scalartensor st alternatives to the standard einstein equations of general relativity. The solutions and the effects of brans dicke field in the gbd theory. We show that, this theory can be conformally symmetrized using an appropriate conformal transformation. Kinetic inflation in deformed phase space brans dicke cosmology. It is possible to reconstruct chameleon field equations by transformation of bransdicke equations from jordan frame jf to einstein. Pdf we investigate the spatially homogeneous bianchi typeiii spacetime.
For this sake, firstly we obtain an exact solution of field. It is shown that among the four classes of the static spherically symmetric solutions of the vacuum brans dicke theory of gravity only two are really independent. Several cosmological solutions of this theory have been found and discussed since then. We consider both original and new type of agegraphic dark energy nade and further assume the sign of the. Black holes in the bransdicke theory of gravitation. Brans, who also contributes personally, is a creative and independent researcher and one of the founders of the scalartensor theory, also known as jordan brans dicke theory.
A study of bransdicke theory in frwmodel springerlink. Pdf mapping of bransdicke theory to chameleon gravity. Farewell to our tutor the memorial speech by sifeng liu on behalf of students of prof. If you do not see its contents the file may be temporarily unavailable at the journal website or you do not have a pdf plugin installed and enabled in your browser. The present study has been conducted in the framework of brans dicke theory, using frw metric with flat space, to determine the time dependence of the brans dicke parameter. Brans building upon, among others, the earlier work of pascual jordan. Initial singularity free quantum cosmology in twodimensional brans dicke theory won tae kim and myung seok yoony department of physics and basic science research institute, sogang university, seoul 121742, korea march 1998 abstract we consider twodimensional brans dicke theory to study the initial singularity problem. In the present book, much space is devoted to scalartensor theories. For this purpose, we take frw universe model with viscous fluid without potential and bianchi type i universe model with barotropic fluid with and without potential. A particular alternative is the brans dicke theory, which has been broadly studied as concerned to k essence type fields in 4d. In the anniversary year of einsteins general theory of relativity, developed 100. Professor deng julong was a tireless lifelong pioneer and founder of grey system theory, so the.
The generalized brans dicke gbd theory is studied in this paper. Bianchi type iii charged fluid universe in brans dicke theory of gravitation. Without knowing the exact theory of the pbrane cosmology, the best guess is that it should be a brans dicke theory with matters. Critical behavior in the bransdicke theory of gravitation. We generalize the bd scalar to complex field with cp violating coupling to curvature and show that the charged bd current can be enhanced during inflationary epoch. Enter your mobile number or email address below and well send you a link to download the free kindle app.
As an example, low energy limit of the string theory contains the brans dicke theory with a ne tuned deformation parameter. The resulting theory allows a particle interpretation, and suggests that the quantum aspects of matter may be geometrized. In theoretical physics, the bransdicke theory of gravitation is a theoretical framework to explain gravitation. Brans building upon, among others, the earlier 1959 work of pascual jordan.
Constraining bianchi type v universe with recent h z. It is well known that, in contrast to general relativity, there are two conformally related frames, the jordan frame and the einstein frame, in which the brans dicke theory, a prototype of generic scalartensor theory, can be formulated. In this paper, we investigate a transitioning model of bianchi type v universe in brans dicke theory of gravitation. We consider a modified bransdicke theory in which except the usual bransdicke parameter a new dimensionful parameter appears. It is well known that, in contrast to general relativity, there are two conformally related frames, the jordan frame and the einstein frame, in which the. Modern physicsbransdicke theory wikibooks, open books.
Pdf bianchi type iii charged fluid universe in bransdicke. Accelerating universe with variable eos parameter of dark. At the frontier of spacetime scalartensor theory, bells inequality. It is an example of a scalartensor theory, a gravitational theory in which the gravitational interaction is mediated by a scalar field as well as the tensor field of general relativity. Conformal relativity or the hoylenarlikar theory is invariant with respect to conformal transformations of the metric.
The gas of solitonic pbrane is treated as a perfect. In this paper, our aim is to constrain an exact bianchi type v universe in brans dicke gravity. For example, the vector could be the angular momentum of a gyroscope orbiting the earth, as carried out by the gravity probe b experiment. In the framework of brans dicke bd theory of gravitation, the time dependence of some cosmological parameters have been determined in the present study, for an universe having a frw spacetime. A new mechanism for baryogenesis is proposed in the context of an extended brans dicke bd theory. We have investigated the spatially homogeneous and isotropic friedmannrobertsonwalker frw universe filled with barotropic fluid and dark energy in the framework of the brans dicke theory of gravitation. The bransdicke theory 1 appeared in the beginning of the. Recently the most general completion of brans dicke theory was appeared with energy exchanged between the scalar field and ordinary matter, given that the equation of motion for the scalar field keeps the simple wave form of brans dicke. In frw space time brans dicke theory is developed for two cases. Cosmic acceleration and bransdicke theory internet archive. At present, both brans dicke theory and general relativity are generally held to be in agreement with observation. So it is of little wonder that it is deprecated given the lack of unique observational support for brans dicke theory. Keywords bianchi typeiii universe, bransdicke theory of gravitation, electromagnetic field, perfect fluid, vector potentials. It is found that only three theories exist which are unambiguously determined from consistency, without imposing arbitrary functions by hand.
Brans dicke theory represents a minority viewpoint in physics. However, this theory is almost unexplored in the context of the dimensional reduction in 3d. We generalize the bd scalar to complex field with cp. Pdf plus 397 k signchangeable interacting agegraphic dark energy in brans dicke cosmology. In this paper, by establishing a brans dicke bd cosmology by means of a deformed phase space, in the absence of any scalar potential, cosmological constant and ordinary matter, we show that it is feasible to overcome obstacles reported in the corresponding commutative nondeformed frameworks. We show how conformal relativity is related to brans dicke theory and to lowenergyeffective superstring theory. On static spherically symmetric solutions of the vacuum. Cosmological dynamics in deformed phase space brans dicke theory.
Pdf global monopoles in bransdicke theory of gravity. Jordan and einstein frames are studied under the light of hamiltonian formalism. Notably, it is a referred, highly indexed, online international journal with high impact factor. A particular alternative is the brans dicke theory, which has been broadly studied as concerned to kessence type fields in 4d. Kinetic inflation in deformed phase space bransdicke. The gbd theory is obtained by generalizing the ricci scalar r to an arbitrary function f r in the original brans dicke bd action. Dicke theory, where the massless scalar field and its con stant coupling. A study of transition of the expansion of the universe. In both jordan and einstein frames, brans dicke theory has four secondary first class constraints, whose constraint algebra is different. The vacuum sector of the brans dicke theory is studied from the viewpoint of a nonconformally invariant gravitational model. The volume is published in honour of carl brans on the occasion of his 80th birthday. Given that the simple wave equation of brans dicke theory for the scalar field is preserved, we have investigated, through exhaustively analyzing the bianchi identities, the consistent theories which violate the exact energy conservation equation. From bransdicke gravity to geometric scalartensor theory. We consider the adm formalism of the bransdicke theory and propose an anisotropic extension of the theory by introducing five free parameters.
The generalized bransdicke theory and its cosmology. Ade with mutual interaction with pressureless dark matter in the background of brans dicke bd theory. Dynamics of the brans dicke theory with a scalar field potential function is investigated. This class of theories contain undetermined functions, but there exist only three theories which are unambiguously determined from consistency. Pdf bianchi type iii charged fluid universe in brans. Emergent universe by tunneling in a jordanbransdicke theory. Einstein theory, the brans dicke theory is the rst one to be considered. However, this theory is almost unexplored in the context of the. The field equations are transformed into a much simpler form under a change of time coordinates and then the solutions are determined for the above cases. In the present work, we study the brans dicke theory in a dimensional reduction context. Diracs constraint theory for hamiltonian systems is applied to brans dicke theory.
Black holes in the brans dicke theory of gravitation. At the frontier of spacetime scalartensor theory, bells. Modified bransdicke theory with spacetime anisotropic parameters. Signchangeable holographic dark energy in bransdicke. Testing scalartensor theories and parametrized postnewtonian. Then you can start reading kindle books on your smartphone, tablet, or computer no kindle device required. International journal of science and research ijsr is published as a monthly journal with 12 issues per year. Cosmological model with linear quation of state in brans.
Signchangeable interacting agegraphic dark energy in. Introduction brans and dicke 1961 formulated an interesting generalisation of einsteins theory of gravitation, in order to incorporate machs principle. Global monopoles in the brans dicke theory of gravity were also analyzed by a. We show that the conformal relativity action is equivalent to the transformed brans dicke action for. We show that the system with a barotropic matter content can be. Jordan bransdicke, theory based on the 1961 publications of brans and dicke. Secondly, for those aspects of the study that focus on dynamical behavior of the brans dicke theory and its stability in jf, it provides us the possibility to find the corresponding equations in chameleon mechanism in ef which are free from singularity and more easier to discussed then transform them to the brans dick theory in jf. Kinetic inflation in deformed phase space brans dicke. Alternatively, you can download the file locally and open with any standalone pdf reader.
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