Uplifting the Iwasawa

doi:10.1002/prop.200510269

2006-03-15

DOI：10.1002/prop.200510269

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The Iwasawa manifold is uplifted to seven-folds of either G(2) holonomy or SU(3) structure, explicit new metrics for the same having been constructed in this work. We uplift the Iwasawa manifold to a G2 manifold through size deformation (of the Iwasawa metric), via Hitchin's Flow equations. showing also the impossibility of the uplift for shape and size deformations (of the Iwasawa metric). Using results of Dall'Agata and Prezas, Phys. Rev. D 69, 066004 (2004) [arXiv:hep-th/0311146] [1], we also uplift the Iwasawa manifold to a 7-fold with SU(3) structure through size and shape deformations via generalisation of Hitchin's Flow equations. For seven-folds with SU(3)-structure, the result could be interpreted as M5-branes wrapping two-cycles embedded in the seven-fold (as in [1]) - a warped product of either a special hermitian six-fold or a balanced six-fold with the unit interval. There can be no uplift to seven-folds of SU(3) structure involving non-trivial size and shape deformations (of the Iwasawa metric) retaining the standard complex structure - the uplift generically makes one move in the space of almost complex structures such that one is neither at the standard complex structure point nor at the edge. Using the results of Konopelchenko and Landolfi, J. Geom. Phys. 29, 319 (1999) [arXiv: math.DG/9804144] [2], we show that given two shape deformation functions, and the dilaton, one can construct a Riemann surface obtained via Weierstra beta representation for the conformal immersion of a surface in R-1, for a suitable l, with the condition of having conformal immersion being a quadric in CPl-1. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA. Weinheim

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