Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005omeg.conf....3m&link_type=abstract
ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2003. Held 17-19 November 2003 in RIKEN, Wako, Saitama, Japan. Edited by M Terasawa,
Astronomy and Astrophysics
Astronomy
2
Scientific paper
The brane-world paradigm is based upon the premise that our universe could be a submanifold embedded in a higher-dimensional spacetime. In the currently popular Randall-Sundrum model, the universe is described as a three-space (3-brane) embedded in a five-dimensional anti-de Sitter spacetime with a large (infinite) extra dimension. This concept is motivated by the D-brane solution found in ten-dimensional superstring theory and eleven dimensional M-theory/supergravity. If correct, this notion significantly alters our views on the origin of matter and origin of galaxies. This talk summarizes some possible observational consequences of brane-world cosmology For example, a new "dark radiation" term arises in the cosmic evolution equations which can affect the radiation dominated epoch. Moreover, matter may literally disappear into (or reemerge from) the extra dimension. This suggests a new interpretations for dark matter, dark energy and their evolution. Further possible consequences of brane-world cosmology are time-varying physical constants and the existence of a sub-horizon compact dimension. Constraints on these possibilities arise from big-bang and stellar nucleosynthesis, observations of high redshift supernovae, galaxy-clusters, X-ray gas in galactic clusters, and the cosmic microwave background. So far, all of the available constraints are consistent with (and may even slightly favor) the existence of a large extra dimension.
Ashenfelter Timothy
Garnavich Peter M.
Ichiki Kiyotomo
Kajino Taka
Mathews Grant J.
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