Anisotropic four loop superstring cosmologies

Details Anisotropic four loop superstring cosmologies Anisotropic four loop superstring cosmologies

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.154..337g&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 154, no. 2, April 1989, p. 337-341.

Physics

Anisotropy, Cosmology, Einstein Equations, Hilbert Space, String Theory, Big Bang Cosmology, Field Theory (Physics), Gravitation Theory, Space-Time Functions, Supersymmetry

Scientific paper

This paper presents the results of an analysis of the behavior of anisotropic homogeneous cosmologies with two scale-factors within the framework of a Lagrangian obtained by adding the four-loop corrections to the Einstein-Hilbert action. It is shown that the four-loop superstring corrections allow the presence of a compactified internal space if, and only if, the external space develops an inflationary period. No compactification scheme can be consistently proposed suggested by the dynamics of the four-loop correction alone. In lower energy epochs, where the Hilbert-Lagrangian becomes relevant, the Ricci-flat compactifications seem quite reasonable; these lead to an exponential expansion of the external dimensions.

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