Long String-like Objects as Galactic Dark Matter

Abstract

Cosmic strings are particular extremals of the action principle determining space-time surfaces as preferred extremals in TGD. TGD cosmic strings have 2-D M⁴projection in M⁴x CP₂ which however thickens during cosmic evolution to magnetic flux tube. The emergence of ordinary manner as energy liberated as the thickness of string increases  can be understood as an analog for  the decay of inflaton field. The properties of  the magnetic flux tubes allow to understand  galactic dark matter and the flat velocity spectrum of distant stars.   Strong correlations between the directions of  rotation planes of galaxies located along flux tube, and free motion along flux tubes  are the basic predictions.