Cosmology and Radion Dynamics in the Randall-Sundram Model
After explaining the reasons behind the renewed recent interest in
theories with extra dimensions and briefly reviewing the most
popular models proposed, we analyze how the presence of extra
dimensions would affect the cosmological expansion of the
Universe. The naive analysis would suggest that one obtains an
unconventional expansion equation. We show that this failure of
the model is due to the presence of an extra massless mode in the
theory corresponding to the fluctuations in the size of the extra
dimension, the radion. We show, that once the radius is
stabilized, the ordinary expansion equation is recovered. However,
the radion will show up as a relatively light field in the SM. We
analyze the properties of the radion field and its consequences
for electroweak observables.
hep group
Last modified: Mon Jan 29 20:22:23 EST 2001