Some aspects of defect theory in spacetime

Details Some aspects of defect theory in spacetime Some aspects of defect theory in spacetime

2012-04-21

arxiv.org/abs/1204.4786v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

22 pages, 2 figures. arXiv admin note: substantial text overlap with arXiv:1108.2904

Scientific paper

The topological theory and the Volterra process are key tools for the classification of defects in Condensed Mater Physics. We employ the same methods to classify the 2D defects of a 4D maximally symmetric spacetime. These \textit{cosmic forms}, which are continuous, fall into three classes: i)- $m$-forms, akin to 3D space disclinations, analogous to Kibble's cosmic strings; ii)- $t$-forms, related to hyperbolic rotations; iii)- $r$-forms, never considered so far, related to null rotations. A detailed account of their metrics is presented. There are \textit{wedge} forms, whose singularities occupy a 2D world sheet, and \textit{twist} forms, whose singularities occupy a 3D world shell. $m$-forms are {compatible} with the cosmological principle of \textit{space} homogeneity and isotropy, $t$- and $r$-forms demand \textit{spacetime} homogeneity. $t$- and $r$-forms are typical of a vacuum obeying the perfect cosmological principle in a de Sitter spacetime. Cosmic forms may assemble into networks generating vanishing curvature.

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