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Abstract: In this paper, we construct Euclidean instanton and wormhole solutions in$d=4$, N=2 supergravity theories with hypermultiplets. The analyticcontinuation of the hypermultiplet action, involving pseudoscalar axions, isdiscussed using the approach originally developed by Coleman which determinesthe apparence of boundary terms. In particular, we investigate the conditionsobtained by requiring the action to be positive-definite once the boundaryterms are taken into account. The case of two hypermultiplets parameterizingthe coset $G {2,2}-SU2\times SU2$ is studied in detail. Orientifoldprojections which reduce the supersymmetry to N=1 are also discussed.



Author: Marco Chiodaroli, Michael Gutperle

Source: https://arxiv.org/







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