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Symplectic potentials and resolved Ricci-flat ACG metrics

Aswin K Balasubramanian1,3, Suresh Govindarajan1 and Chethan N Gowdigere2

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We pursue the symplectic description of toric Kähler manifolds. There exists a general local classification of metrics on toric Kähler manifolds equipped with Hamiltonian 2-forms due to Apostolov, Calderbank and Gauduchon (ACG). We derive the symplectic potential for these metrics. Using a method due to Abreu, we relate the symplectic potential to the canonical potential written by Guillemin. This enables us to recover the moment polytope associated with metrics and we thus obtain global information about the metric. We illustrate these general considerations by focusing on six-dimensional Ricci-flat metrics and obtain Ricci-flat metrics associated with real cones over Lpqr and Ypq manifolds. The metrics associated with cones over Ypq manifolds turn out to be partially resolved with two blow-up parameters taking special (non-zero) values. For a fixed Ypq manifold, we find explicit metrics for several inequivalent blow-ups parametrized by a natural number k in the range 0 < k < p. We also show that all known examples of resolved metrics such as the resolved conifold and the resolution of {\bb C}^3/{\bb Z}_3 also fit the ACG classification.


PACS

04.20.Jb Exact solutions

11.10.Cd Axiomatic approach

02.40.Sf Manifolds and cell complexes

11.30.Pb Supersymmetry

04.50.-h Higher-dimensional gravity and other theories of gravity

MSC

32Q20 Kähler-Einstein manifolds (See also 53Cxx)

83C20 Classes of solutions; algebraically special solutions, metrics with symmetries

81T05 Axiomatic quantum field theory; operator algebras

83C05 Einstein's equations (general structure, canonical formalism, Cauchy problems)

81T60 Supersymmetric field theories

83C15 Exact solutions

Subjects

Mathematical physics

Gravitation and cosmology

Particle physics and field theory

Dates

Issue 24 (21 December 2007)

Received 1 September 2007, in final form 31 October 2007

Published 29 November 2007



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