Cosmological constant from gauge fields on extra dimensions

Details Cosmological constant from gauge fields on extra dimensions Cosmological constant from gauge fields on extra dimensions

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..957..405h&link_type=abstract

PARTICLES, STRINGS, AND COSMOLOGY: 13th International Symposium on Particles, Strings, and Cosmology-PASCOS 2007. AIP Conferenc

Computer Science

2

Observational Cosmology, Particle-Theory And Field-Theory Models Of The Early Universe, Dark Energy, Compactification And Four-Dimensional Models, Spontaneous Breaking Of Gauge Symmetries

Scientific paper

We present a new model of dark energy which could explain the observed accelerated expansion of our Universe. We show that a five-dimensional Einstein-Yang-Mills theory defined in a flat Friedmann-Robertson-Walker universe compactified on a circle possesses degenerate vacua in four dimensions. The present Universe could be trapped in one of these degenerate vacua. With the natural requirement that the size of the extra dimension could be of the GUT scale or smaller, the energy density difference between the degenerate vacua and the true ground state can provide us with just the right amount of dark energy to account for the observed expansion rate of our Universe.

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