Metric and coupling reversal in string theory
arXiv:hep-th/0605274 · doi:10.1016/j.nuclphysb.2006.10.016
Abstract
Invariance under reversing the sign of the metric G_{MN}(x) and/or the sign of the string coupling field H(x), where <H(x)> = g_s, leads to four possible Universes denoted 1,I,J,K according as (G,H) goes to (G,H), (-G,H), (-G,-H), (G,-H), respectively. Universe 1 is described by conventional string/M theory and contains all M, D, F and NS branes. Universe I contains only D(-1), D3 and D7. Universe J contains only D1, D5, D9 and Type I. Universe K contains only F1 and NS5 of IIB and Heterotic SO(32).
LaTeX, 27 pages; v2: New results on Green-Schwarz corrections; transformation rules for axions; corrected F-theory treatment; other minor additions and corrections
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