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Why is the Universe Accelerating?
Sean M. Carroll
The universe appears to be accelerating, but the reason why is a complete mystery. The simplest explanation, a small vacuum energy (cosmological constant), raises three difficult i…
Is Cosmic Speed-Up Due to New Gravitational Physics?
Sean M. Carroll, Vikram Duvvuri, Mark Trodden +1
We show that cosmic acceleration can arise due to very tiny corrections to the usual gravitational action of General Relativity of the form , with . This eliminates the n…
Sidestepping the Cosmological Constant with Football-Shaped Extra Dimensions
Sean M. Carroll, Monica M. Guica
We present an exact solution for a factorizable brane-world spacetime with two extra dimensions and explicit brane sources. The compactification manifold has the topology of a two-…
Can the dark energy equation-of-state parameter w be less than -1?
Sean M. Carroll, Mark Hoffman, Mark Trodden
Models of dark energy are conveniently characterized by the equation-of-state parameter w=p/ρ, where ρis the energy density and p is the pressure. Imposing the Dominant Energy Cond…