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Classical Stabilization of Homogeneous Extra Dimensions
Sean M. Carroll, James Geddes, Mark B. Hoffman +1
If spacetime possesses extra dimensions of size and curvature radii much larger than the Planck or string scales, the dynamics of these extra dimensions should be governed by class…
Dark Energy and the Preposterous Universe
Sean M. Carroll
A brief review is offered of the theoretical background concerning dark energy: what is required by observations, what sort of models are being considered, and how they fit into pa…
Testing The Friedmann Equation: The Expansion of the Universe During Big-Bang Nucleosynthesis
Sean M. Carroll, Manoj Kaplinghat
In conventional general relativity, the expansion rate H of a Robertson-Walker universe is related to the energy density by the Friedmann equation. Aside from the present day, the…
Noncommutative Field Theory and Lorentz Violation
Sean M. Carroll, Jeffrey A. Harvey, V. Alan Kostelecky +2
The role of Lorentz symmetry in noncommutative field theory is considered. Any realistic noncommutative theory is found to be physically equivalent to a subset of a general Lorentz…
Can we live in a self-tuning universe?
Sean M. Carroll, Laura Mersini
The self-tuning brane scenario is an attempt to solve the cosmological constant problem in the context of extra dimensions. Rather than making the vacuum energy small, this approac…