{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

ArvixBraneWorld

ArvixBraneWorld - arXiv:hep-th/0404011v1 2 Apr 2004 Brane...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: arXiv:hep-th/0404011v1 2 Apr 2004 Brane World Cosmology Philippe Brax † , Carsten van de Bruck ‡ and Anne–Christine Davis ∗ † Service de Physique Th´ eorique, CEA-Saclay F-91191, Gif/Yvette cedex, France ‡ Department of Applied Mathematics, Astro–Particle and Cosmology Group University of Sheffield, Hounsfield Road, Hicks Building Sheffield S3 7RH, United Kingdom * Department of Applied Mathematics and Theoretical Physics, Center for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, U.K. E-mail: [email protected], [email protected], [email protected] Abstract. Recent developments in the physics of extra dimensions have opened up new avenues to test such theories. We review cosmological aspects of brane world scenarios such as the Randall–Sundrum brane model and two–brane systems with a bulk scalar field. We start with the simplest brane world scenario leading to a consistent cosmology: a brane embedded in an Anti–de Sitter space–time. We generalise this setting to the case with a bulk scalar field and then to two–brane systems. We discuss different ways of obtaining a low–energy effective theory for two–brane systems, such as the moduli space approximation and the low–energy expansion. A comparison between the different methods is given. Cosmological perturbations are briefly discussed as well as early universe scenarios such as the cyclic model and the born–again brane world model. Finally we also present some physical consequences of brane world scenarios on the cosmic microwave background and the variation of constants. Brane World Cosmology 2 1. Introduction Whilst theories formulated in extra dimensions have been around since the early twentieth century, recent developments have opened up new avenues which have enabled the cosmological consequences of such theories to be extracted. This, together with advances in high precision cosmological data, opens up the exciting possibility of testing and constraining extra–dimensional theories for the first time. In this review we explore these developments. In the early twentieth century Kaluza and Klein [1], following Nordstrom, attempted to unify electromagnetism and gravity by proposing a theory in five space–time dimensions, with the extra spatial dimension compactified on a circle. More recently, attempts to construct a consistent theory incorporating both quantum mechanics and gravity have been constructed in more than four dimensions, with the extra, spatial dimensions compactified. In particular superstring theories, which include both quantum theory and gravity, are only consistent in ten dimensions [2], with the extra dimensions being spatial. The usual four dimensional physics is retrieved by compactifying on a compact manifold with dimensions typically of the order of the Planck scale. This is essentially a generalisation of Kaluza–Klein theory....
View Full Document

{[ snackBarMessage ]}

Page1 / 57

ArvixBraneWorld - arXiv:hep-th/0404011v1 2 Apr 2004 Brane...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon bookmark
Ask a homework question - tutors are online