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Since the CMB results of the past decade, would it be fair to say that the consensus among cosmologists is that cosmic strings are no longer considered as a (major) source for density perturbations?

If so, what are the leading theories to explain how the universe developed inhomogeneity from a nearly uniform early universe?

What are the active areas of research for within structure formation today, besides relying upon relativistic perturbation methods? Is there a recent review for a status of the field today?

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Now that the Planck data is out, much stricter constraints have been placed on cosmic strings. See by the Planck Collaboration. – Brandon Enright Apr 26 '13 at 23:12

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