Roy Maartens
Institute of Cosmology & Gravitation, University of Portsmouth, Portsmouth PO1 2EG, UK
Recibido el 1 de mayo de 2006
Aceptado el 1 de noviembre de 2006
Abstract
]]> If string theory is on the right track as a description of nature, then our observable universe may be a 3–dimensional membrane surface in a higher–dimensional spacetime. The brane–world picture of the universe, as inspired by string theory, opens up new vistas in cosmology. The extra polarizations of the higher–dimensional graviton, and the additional fields arising from the extra dimensions, bring new features that may leave detectable signatures. Moreover, the hope is that these new ingredients will shed light on the major puzzles associated with the standard cosmological model – in particular, the problem of explaining inflation and the dark energy problem.Keywords: Cosmological models; dark energy; brane–world models.
Resumen
Si la teoría de cuerdas es una descripción correcta de la naturaleza, entonces nuestro universo observable puede ser una membrana tridimensional en un espacio–tiempo de mayor dimensionalidad. La visión del universo basada en mundos brana, inspirada en la teoría de cuerdas, abre nuevas posibilidades en la cosmología. Las polarizaciones extra del gravitón en más dimensiones, y los campos adicionales que aparecen debido a las dimensiones extra, tienen como consecuencia nuevas propiedades que producir senales detectables. Además, existe la esperanza de que estos nuevos ingredientes iluminen algunos de los mayores problemas asociados con el modelo cosmológico estándar – en particular, el problema del origen de la inflación y la energía obscura.
Descriptores: Modelos cosmológicos; energía obscura; modelos de mundos brana.
PACS: 95.36.+x; 98.80.–k; 98.80.Cq; 98.80.Qc
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]]>Acknowledgements
I thank the organisers for the invitation to present this work, which was supported by PPARC.
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