Field equations and lagrangian for the kaluza metric. The autobiography of nikola tesla, text file or pdf file. A criticaldensity closed universe in bransdicke theory a criticaldensity closed universe in bransdicke theory. Pdf a new mechanism for baryogenesis is proposed in the context of an extended bransdicke bd theory. Bransdicke theory can be of good choice to study dark energy and the. Black holes in the bransdicke theory of gravitation. The theory respects machs principle and the weak equivalence principle. As for a nonstandard theory of gravitation, we adopt a bransdicke theory which incorporates a cosmological constant. Jun 06, 2011 recently, a class of spherically symmetric thinshell wormholes in bransdicke gravity have been introduced. Ferreiraa, antonio padillab, constantinos skordisb adepartment of astrophysics, university of oxford, uk. Pdf this is primarily an historical survey of the origins and evolution of only one of a variety of many scalartensor st alternatives to the. Perimeter institute for theoretical physics, waterloo, ontario n2l 2y5, canada department of physics, university of waterloo, waterloo, ontario n2l. 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. Exact solutions are studied in the context of modified bransdicke theory.
For two different choices of gauge, we study the resulting equations by examining both the local and global properties of the solutions, by. 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 bransdicke theory, a prototype of generic scalartensor theory, can be formulated. In standard einstein theory the spacetime metric tensor, or. A new mechanism for baryogenesis is proposed in the context of an extended brans dicke bd theory. There is a long standing debate on the physical equivalence of the formulations in these two different frames. A new mechanism for baryogenesis is proposed in the context of an extended bransdicke bd theory. A kaluzaklein inspired bransdicke gravity with dark. A unified dark fluid characterised by a linear equation of state is considered as the source of dark energy. Dark energy on higher dimensional spherically symmetric. Brans building upon, among others, the earlier work of pascual jordan. Modern physicsgravity wikibooks, open books for an open world. Holographic dark energy cosmological models in fg theory. It is a scalar tensor theory in which the gravitational interaction is mediated by a scalar field as well as the tensor field gij. Bianchi typev cosmological model with linear equation of.
Brans and dicke adopted a variation of the conventional kinetic term in their lagrangian, parameterized with the famous coefficient. Masterfully written by pioneers of the subject, comprehensive, uptodate and replete with illuminating problem sets and their solutions, string theory and mtheory. It is considered by many astronomers to be the most serious alternative to general relativity. Bransdicke theory hamity victor h and barraco daniel e fa. Cosmic acceleration and bransdicke theory internet archive. Pdf we consider an approach to bransdicke theory of gravity in which the scalar field is considered as a geometrical field. In this paper, we study cosmological implication of the interacting entropycorrected holographic dark energy model in the framework of bransdicke cosmology. The definition of the sparlingthirring form is extended to bransdicke theory. Modern physicsbransdicke theory wikibooks, open books for. Sep 09, 2015 the term brans dicke, apparently first introduced by dicke in his 1962 paper on transformation of units dicke 1962, is widely used to describe a modification of einsteins original formulation of general relativity to bring it into conformity with some form of machs principle. Then i have discussed the derivation of the field equation for the bd. However, the entropyarea relation can be modified from the inclusion of quantum effects, motivated from the loop quantum gravity, string theory and black hole physics. The nonlinearity of the modified bransdicke field equations is treated with the eulerduartemoreira method of integrability of anharmonic oscillator equation.
Dec 18, 2011 however, the entropyarea relation can be modified from the inclusion of quantum effects, motivated from the loop quantum gravity, string theory and black hole physics. In this paper, we discuss a gravitational theory based on the generalized gauge field. 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. In addition, a bransdicke theory can always be transformed into a minimally coupled scalareinsteintheory1,36,ascantheoriginalf. Modi ed gravity and cosmology timothy cliftona, pedro g. Aug, 2019 exact solutions are studied in the context of modified bransdicke theory. We consider the adm formalism of the bransdicke theory and propose a space time anisotropic extension of the theory by introducing five free parameters. It is found that only three theories exist which are unambiguously determined from consistency, without imposing arbitrary functions by hand. Bransdicke theory as a unified model for dark matterdark energy. These theories predict nonminimal couplings of the higgs. Nov 18, 2014 the bransdicke theory appeared in the beginning of the 1960s as an important alternative to the theory of general relativity gr. Bransdicke theory article about bransdicke theory by the.
Modified bransdicke theory with spacetime anisotropic. In this letter, we first obtain all the exact solutions satisfying the wec. By continuing to use our website, you are agreeing to our use of cookies. A study on the expanding universe based on a model of the. Newsfeed onedrive sites erik e gottschalk fermipoint.
Look at einsteins and kaluzas unified field theories, a series of sixteen very complex tensor equations integrating the electromagnetic and gravity forces into a 4th. Hence, a dynamical field \\phi \ represents the gravitational. Scalartensor theories of gravity di er from general relativity gr because they describe gravitation using not only a spacetime metric, but also a scalar eld that. Stability of bransdicke thinshell wormholes, physics. If two theories are both consistent with the same experimentalobservational data, then we prefer the simpler one. Whereas, in this modified theory, all matters are the reason for the gravitational behaviour of. Violation of equivalence principle in bransdicke theory.
This paper is devoted to study the accelerated expansion of the universe by exploring the brans dicke parameter in different eras. 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. The big why welcome to readers of the ultimate key to happiness. As particular examples we consider selfaccelerating covariant galileons, bransdicke theory and parameterizations based on the effective field theory of dark energy, using the hi class code to address the impact of these models on relativistic corrections to lss observables. Einsteinhilbert action, variational principle, palatini identity. Exact solutions and accelerating universe in modified.
Bransdicke theory represents a minority viewpoint in physics. In frw space time bransdicke theory is developed for two cases. While some solutions show a forever accelerating nature, in some cases there is a signature flip in the evolution of deceleration parameter in recent. I have emphasized on the formalism of brans dicke theory and the need to introduce it. Exact solutions and accelerating universe in modified brans. Brans dicke theory in the local potential approximation dario benedetti1 and filippo guarnieri1,2 1max planck institute for gravitational physics albert einstein institute, am muhlenberg 1, d14476 golm, germany 2dipartimento di fisica, universita degli studi di roma tre and infn sezione di roma tre, via della vasca navale 84, i00146 rome, italy email. Recent observations have revealed that the present state of the. On earth, gravity gives weight to physical objects, and the moons gravity causes the ocean tides. Then we show these solutions can be stable for certain parameters.
The gravitational attraction of the original gaseous matter. Recently, a class of spherically symmetric thinshell wormholes in bransdicke gravity have been introduced. Since then alternatives to the general theory of relativity like the bransdicke theory, scalartensor theories of gravity and their higher derivative. From wikibooks, open books for an open world 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. Brans and dicke 1 theory of gravitation is well known modified version of einsteins theory.
Sudipto roy, dibyajyoti laha, argho aranya sangma and indrani pal. The radiationmatter transition in jordanbransdicke theory. Bransdicke theory article about bransdicke theory by. Anisotropic dark energy cosmological models are constructed in the frame work of generalised bransdicke theory with a selfinteracting potential. As particular examples we consider selfaccelerating covariant galileons, brans dicke theory and parameterizations based on the effective field theory of dark energy, using the hi class code to address the impact of these models on relativistic corrections to lss observables.
Brans building upon, among others, the earlier 1959 work of pascual jordan. So it is of little wonder that it is deprecated given the lack of unique observational support for bransdicke theory. Bransdicke theory at the classical level, we concentrate our analysis on the. The general energy expression provided by the superpotential in the jordan frame is discussed in relation. A study of bransdicke theory in frwmodel springerlink. In standard einstein theory the spacetime metric tensor, or more precisely geometry, is. At present, both bransdicke theory and general relativity are generally held to be in agreement with observation. Why isnt bransdicke theory preferable to einsteins general. Indeed, scalar field theory does typically have such a quadratic term, and such a term was quickly added to the generalized 5d theory as early as the 1940s.
Pdf a geometrical approach to bransdicke theory researchgate. Redish university of maryland list of scientists with small images honored on currency throughout the world. Bransdicke theory branz dik a relativistic theory of gravitation put forward in the 1960s by carl brans and robert dicke as a variant of einsteins general theory of relativity. Generalized sparlingthirring form in the bransdicke theory. A study on the expanding universe based on a model of the time variation of its matter content in the framework of bransdicke theory. It is a competitor of einsteins theory of general relativity. Unified dark fluid in bransdicke theory pdf paperity. By writing the bransdicke field equations in a formally maxwelllike form, a superpotential and a corresponding pseudoenergymomentum form are defined.
Our lagrangian is invariant not only under local lorentz trans we use cookies to enhance your experience on our website. In a modern context bransdicke theory appears naturally from a email. These papers substantially duplicate much of the work of. In theoretical physics, the brans dicke theory of gravitation sometimes called the jordan brans dicke theory is a theoretical framework to explain gravitation. The bransdicke bd theory of gravity is taken as a possible theory of kessence coupled to gravity. 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.
A modern introduction provides an ideal preparation for research on the current forefront of the fundamental laws of nature. In general, the bd theory of gravity, in the presence of matter with lagrangian. Modern physicsgravity wikibooks, open books for an open. The term bransdicke, apparently first introduced by dicke in his 1962 paper on transformation of units dicke 1962, is widely used to describe a modification of einsteins original formulation of general relativity to bring it into conformity with some form of machs principle. 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. Kaluzaklein, brans dicke theory, dark matter, dark energy 1. 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. While some solutions show a forever accelerating nature, in some cases there is a signature flip in the evolution of deceleration parameter in recent past.
Tesla was not the only one with a dynamic theory, and not just gravity either. The bransdicke theory appeared in the beginning of the 1960s as an important alternative to the theory of general relativity gr. In theoretical physics, the bransdicke theory of gravitation is a theoretical framework to explain gravitation. The main idea of this theory is to consider the gravitational coupling \g\ as a dynamical quantity, implementing in this way the large number hypothesis formulated by dirac. In this paper, we show that the bransdicke scalartensor theory of gravitation, one of the most widely used generalizations of einsteins general relativity, is. Why isnt nikola teslas dynamic theory of gravity used. May 17, 2020 in this paper, locally rotationally symmetric lrs bianchi typei models with holographic dark energy within the framework of fg theory of gravitat. Pdf the omegatendstoinfinity limit of bransdicke theory valerio faraoni academia. While solving bransdickes field equations for bianchi type v cosmological model, we have used a special law of variation of hubble parameter proposed by berman.
A study on the expanding universe based on a model of the time variation of its matter content in the framework of brans dicke theory author. Role of the action in constructing the feynman path integral for quantized gravity. In this paper, locally rotationally symmetric lrs bianchi typei models with holographic dark energy within the framework of fg theory of gravitat. Raw binaries containing spectral curve data available with an accompanying mathematica notebook at this s url 180mb zip archive. Secondly, cdm, though providing a model for the late time speedup, must be supported in any case with an in. 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.
Dark energy on higher dimensional spherically symmetric brans. It is well known that the kaluzaklein theory reduces to a dicke theory and the kaluzaklein theory, and to clarify some of the misunderstandings at this point it is perhaps important for us to discuss the similarity between the. Modern physicsbransdicke theory wikibooks, open books. Gravity from latin gravitas, meaning weight, or gravitation, is a natural phenomenon by which all things with mass or energyincluding planets, stars, galaxies, and even light are brought toward or gravitate toward one another. As promised, in this document, ill give you a detailed summary of the big why behind why the mind machine was created and why it operates as it does.
1284 949 538 1272 573 1104 1178 29 457 691 1131 1116 166 204 196 1386 905 1506 729 146 498 178 787 36 279 1253 179 795 1277 727 208 694 272 625 273 892 1331 1090 947 1075 1473 1494 1119 1133 302 62 1272 42