The induced gravity brane model proposed by dvali, gabadadze and porrati and its extension are also discussed. Brane cosmology progress of theoretical physics supplements. We have realized that it is not obvious that the postin. Starobinskylike inflation in dilaton brane cosmology.
Supersymmetry and brane cosmology antonio riotto a. Cosmology of dilatonic brane world donam youm1 ictp, strada costiera 11, 34014 trieste, italy abstract we study cosmological solutions in the dilatonic brane world models. The central idea is that the visible, threedimensional universe is restricted to a brane inside a higherdimensional space, called. Pdf anisotropy in borninfeld brane cosmology zahra.
In the brane scenario, the earlier model proposed by regge and teitelboim is an attempt to generalize gr 3, consisting of a brane ricci. Brane cosmology itself is why gravity is weaker, at least according to the theories mentioned in the lead. May 25, 2016 the brane world cosmology is based on the socalled rs ii model first proposed by randall and sundrum rs, where the standard model particles are confined on a 3 brane at a boundary embedded in fivedimensional antide sitter ads spacetime. A series of theories and models like the superstring theory, have shown certain success as fundamental theories. Quantum cosmology and adscft luis anchordoquia,1, carlos nun. Papantonopoulosa national technical university of athens, physics department, zografou campus, gr 157 80, athens, greece. The brane world picture of the universe, as inspired by string theory, opens up new vistas in cosmology. We describe the equations and matching conditions in the case of flat, spherical and hyperbolic slicing of the bulk geometry and find the conditions for the existence of a static solution. Brane cosmology and the selftuning of the cosmological constant. Timeindependent and timedependent scalar field configurations with the most general homogeneous and isotropic 4d metric are considered. Request pdf brane cosmology we summarize the main ideas underlying brane cosmology, or the cosmology of a universe considered as a submanifold of a higherdimensional. Disformally coupled cosmologies arise from diracborninfeld actions in type ii string theories, when matter resides on a moving hidden sector d brane. The brane cosmology has invoked new challenges to the usual big bang cosmology.
An active line of research towards this goal resides in braneworld cosmology where any proposed geometrical model should be selfconsistent and able to reproduce an accurate cosmological evolution 1,2. This subject deals with the cosmological behaviour of a brane universe, i. In the latter case, such modifications are usually related to the existence of extra dimensions which is also required by unification theories, giving rise to the socalled brane cosmology. Our attention in this paper is paid to an extension of the braneworld scenarios in the. Some versions of brane cosmology, based on the large extra dimension idea, can explain the weakness of gravity relative to the other fundamental forces of nature, thus solving the hierarchy problem. Brane cosmology refers to several theories in particle physics and cosmology related to string. Aug 16, 2005 the creation of the inflationary brane universe in 5d bulk einstein and einsteingaussbonnet gravity is considered.
The stability of the bianchi type i anisotropic brane. Starobinskylike inflation in dilatonbrane cosmology sciencedirect. In this paper we present a brief account on thermal history of the postin. In the usual friedmannrobertsonwalker frw model the scale noninvariant nbi matter gives rise to an equation of state which asymptotes to the string gas equation p. Oct 06, 2004 we discuss isotropic and homogeneous d brane world cosmology with nonabelian borninfeld nbi matter on the brane. Because of the ads spacetime geometry, massless graviton in fourdimensional effective theory. We argue that some fundamental physical principle which may be related with adscft correspondence is necessary. Then we introduce an intrinsic curvature scalar term in the bulk action, and analyze. Apart from inflationary and postinflationary brane cosmology. Oct 11, 2002 the aim of these lectures is to give a brief introduction to brane cosmology. Nonabelian brane cosmology, astrophysics and space science. Dec 09, 20 download fulltext pdf download fulltext pdf read fulltext. Nonabelian brane cosmology, astrophysics and space. This is likewise one of the factors by obtaining the.
Evolution with time of the distance x from the second brane to the horizon in the case of ds 4 for an initial. This article is titled brane cosmology, but im not seeing much cosmology content in the article, at least in the sense in which i understand cosmology a largely observational science. The stability of the bianchi type i anisotropic brane cosmology is analyzed in this paper. In the brane picture, the electromagnetic, weak and strong nuclear force are localized on the brane, but gravity has no such constraint and.
We make use of the generalized infraredcutoff holographic dark energy, introduced by nojiri and odintsov we consider various examples. Download fulltext pdf download fulltext pdf read fulltext. A model for superstring cosmology in which the background spacetime is described as in 4,5 by dilaton gravity, and the matter source is a gas of branes, has recently been studied under the name of brane gas cosmology 8,9 see also 10,11 for extensions to backgrounds which are not toroidal, and 12 for an extension to an anisotropic. Pdf modified geodetic brane cosmology ruben cordero. A brief survey of string brane cosmology sudhakar panda where. Physicists often study fields analogous to the electromagnetic field, which live on the worldvolume of a brane.
May 17, 2001 finally, 6 euclidean brane cosmology, 7 conclusion contain some concluding remarks. The interest was motivated partly by the insights which static brane con. Institute of physics, national chiao tung university, hsin chu 300, taiwan. Brane cosmology with the chameleon scalar field in bulk. Brane world cosmology without the z2 symmetry sciencedirect.
After introducing some basic geometrical notions, we discuss the cosmology of a brane universe with matter localized on the brane. Simple inflationary models in gaussbonnet braneworld cosmology. Abstract the aim of these lectures is to give a brief introduction to brane cosmology. Slinky evolution of domain wall brane cosmology, phys. In the last few years, brane cosmological models with extra dimensions have been actively studied. The e ective fourdimensional equations on the brane are analyzed for the models with one positive tension brane and two branes with tensions of opposite signs. After introducing some basic geometrical notions, we discuss the cosmology of a brane universe with matter localized. The weak energy conditon requires that the energy density is nonnegative. We summarize the main ideas underlying brane cosmology, or. Cosmic acceleration may be the result of unknown physical processes involving either new fields in high energy physics or modifications of gravitation theory.
Braneworld evolution with branebulk energy exchange. This article is devoted to the application of the holographic principle to describe rip brane cosmological models in the presence of a bulk viscosity. Bohdan grzadkowskia and jose wudkab a facultyof physics, university of warsaw, ho. Physicists have been trying to figure out why its weaker for decades. The brane energymomentum tensor enters these equations both linearly and quadratically. We demonstrate that the emerging universe is ambiguous due to arbitrary function dependence of the junction conditions or freedom in the choice of boundary terms. Some analytic solutions have been found when the scalar field couples to the brane 6, but they correspond to static solutions where the cosmological evolution is due to the motion of the brane into the bulk. Evolution with time of the distance x from the second brane to the horizon in the case of ds 4 for an initial position r i download. We consider cosmology of brane world scenario in the frame work of teleparallel gravity in that way matter is localized on the. This new scenario, motivated by recent developments in string.
Then we introduce an intrinsic curvature scalar term in the bulk action, and analyze the cosmology of this induced gravity. Pdf on tduality in brane gas cosmology timon boehm. Brane cosmology and the selftuning of the cosmological constant in. Brane cosmology refers to several theories in particle physics and cosmology related to string theory, superstring theory and mtheory brane and bulk. The aim of these lectures is to give a brief introduction to brane cosmology.
Mar 12, 2020 motivated by the holographic selftuning proposal of the cosmological constant, we generalize and study the cosmology of brane worlds embedded in a higherdimensional bulk black hole geometry. Toggle navigation swansea universitys research repository. From the particle physics world we already know that there is no evidence of quantum gravity either supersymmetry, or string effects well up to energies around. We also study the effect of the brane solution by comparing the. In fact, we suppose that the scalar degree of freedom which mimics the dark sectors on the brane has its origin on the bulk scalar field. All the abovementioned studies in brane cosmology were done in the. We consider the imbalance of matter and antimatter by using a gravitational baryogenesis mechanism in the background of dvaligabadadzeporrati dgp brane cosmology. Using this formalism, we also analyze other brane models. Brane cosmology with a bulk scalar field international. Simple inflationary models in gaussbonnet braneworld. We discuss some effects induced by those terms in cosmology. We search for timedependent solutions for the 5dimensional system of a scalar field canonically coupled to gravity. Brane gas cosmology seems to us very promising to bring together string theory and cosmology. Gravitational baryogenesis in dgp brane cosmology springerlink.
This work is only part of a tremendously growing ood of literature, but we. However, we show that, in the context of dgp brane cosmology, the ratio of baryon number. Since such matter interacts only very weakly with the standard model particles, this scenario can provide a natural origin for the dark sector of the universe with a clear geometrical interpretation. Following the adscft prescription, we regard the brane as the boundary of the ads geometry. In this regard, it has been shown that the cosmology of such models is characterized by a non standard friedmann equation 4,5. Employing the holographic principle, the five dimensional bulk gravity theory is dual to a strongly coupled four dimensional quantum field theory. The content of this article is much more oriented toward theoretical considerations, so i submit that the article might be better titled braneworld, as that is. Perturbations on a moving d3 brane and mirage cosmology download.
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