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Quasar variability limits on cosmological density of cosmic strings
Quasar variability limits cosmological density cosmic strings
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2010/3/19
We put robust upper limits on the average cosmological density \Omega_s of cosmic strings based on the variability properties of a large homogeneous sample of SDSS quasars. We search for an excess of ...
On Current-Carrying Cosmic Strings and the Generalized Rainich Algebra in Scalar-Tensor Gravities
Current-Carrying Cosmic Strings the Generalized Rainich Algebra Scalar-Tensor Gravities
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2010/10/15
We obtain exact solutions for a static and charged cosmic string in a Einstein-Maxwell-Dilaton theory of a scalar-tensor type in (3+1)-Dimensions. This theory is specified by the dilaton field f, the ...