Naturalness Problems and Quintessence

Details Naturalness Problems and Quintessence Naturalness Problems and Quintessence

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003idm..conf...27b&link_type=abstract

THE IDENTIFICATION OF DARK MATTER. Proceedings of the Fourth International Workshop. Held 2 - 6 September 2002 in York, UK. Edit

Mathematics

Logic

Cosmology

Scientific paper

Despite their many attractive cosmological features, quintessence models face two major naturalness problems: 1. They do not yet explain present-day cosmic acceleration in a generic way, using only attractor solutions. 2. They are difficult to obtain within realistic microscopic theories, due the incredibly small mass which is required by the quintessence field. This article summarizes both of these difficulties, and briefly outlines a recent proposal for circumventing the second of them within a brane-world context. This proposal leads to a broader class of dynamics for the quintessence field than is normally considered, in which the its couplings slowly run (or: `walk') over cosmological time scales. The walking of the quintessence couplings may help produce acceptable cosmologies using attractor solutions.

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