A new non-perturbative time-dependent string configuration

Details A new non-perturbative time-dependent string configuration A new non-perturbative time-dependent string configuration

2007-08-10

arxiv.org/abs/0708.1494v1

AIPConf.Proc.957:289-292,2007

Physics

High Energy Physics

High Energy Physics - Theory

Talk given at PASCOS-07

Scientific paper

10.1063/1.2823783

A time-dependent bosonic string configuration is discussed, in graviton and dilaton backgrounds, leading to Weyl-symmetry beta-functions which are homogeneous in X^0, to any order in alpha'. As a consequence, a string reparametrization can always be implemented, such that beta functions can be cancelled, to any order in alpha'. This non-perturbative conformal invariance is valid for any target space dimension, and leads to a power law expanding Universe, for which the power vanishes if a specific relation between the dimension and dilaton amplitude holds. Finally, D=4 is the minimum dimension (in the case of a spherical world sheet) for which this configuration is consistent with a Wick rotation in a Minkowski target space.

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