Cosmology on a 3-brane

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Abstract
In this paper a general solution is found for a five-dimensional orbifold spacetime that induces a k = 0 cosmology on a 3-brane. Expressions for the energy density and pressure on the brane in terms of the brane metric are derived. Given a metric on the brane it is possible to find five-dimensional spacetimes that contain the brane. This calculation is carried out for an inflationary universe and for a metric that corresponds to a radiation-dominated universe in standard cosmology. It is also shown that any k = 0 cosmology can be embedded in a flat five-dimensional orbifold spacetime and the equation of the 3-brane surface is derived. For an inflationary universe it is shown that the surface is the usual hyperboloid representation of de Sitter space, although it is embedded in an orbifold spacetime.