NDLI: Brane-world cosmology and inflation

Content Provider	Springer Nature Link
Author	Sasaki, Misao
Copyright Year	2004
Abstract	There has been substantial progress in brane-world cosmology in recent years. Much attention has been particularly paid to the second Randall-Sundrum (RS2) scenario in which a single positive-tension brane is embedded in a five-dimensional space-time, called the bulk, with a negative cosmological constant. This brane-world scenario is quite attractive because of the non-trivial geometry in the bulk and because it successfully gives four-dimensional general relativity in the low energy limit. After reviewing basic features of the RS2 scenario, we consider a brane-world inflation model driven by the dynamics of a scalar field living in the five-dimensional bulk, the so-called bulk inflaton model. An intriguing feature of this model is that the projection of the bulk inflaton on the brane behaves just like an ordinary inflaton in four dimensions in the low energy regime,H $^{2}$ l $^{2}$ « 1, whereH is the Hubble expansion rate of the brane andl is the curvature radius of the bulk. We then discuss the cosmological perturbation on superhorizon scales in this model. We find that, even under the presence of spatial inhomogeneities, the model is indistinguishable from the standard four-dimensional inflation toO(H $^{2}$ l $^{2}$). That is, the difference may appear only atO(H $^{14}$ l $^{4}$).
Starting Page	785
Ending Page	796
Page Count	12
File Format	PDF
ISSN	03044289
Journal	Pramana
Volume Number	63
Issue Number	4
e-ISSN	09737111
Language	English
Publisher	Springer India
Publisher Date	2004-01-01
Publisher Place	New Delhi
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Brane world cosmology inflation Physics Astronomy Astrophysics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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