8 Acknowledgments

This review originates from lectures given at Iberian Strings 2012 in Bilbao. I am very grateful to the organizers I. Bandos, I. Egusquiza, J.L. Mañes, M.A. Valle and C. Meliveo for the invitation to lecture in this outstanding and agreeable conference. I gratefully thank V. Balasubramanian, J. de Boer, B. Chen, C.-M. Chen, B. Chowdury, A. Castro, S. Detournay, J. Jottar, F. Larsen, S. Markoff, K. Murata, M. Rangamani, H. Reall, S. Sheikh-Jabbari, K. Skenderis, A. Strominger, A. Virmani and especially M. Guica and T. Hartman for interesting exchanges during the writing of this review. This work has been financially supported by the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) via an NWO Vici grant. It is also currently supported by the FNRS, Belgium. I finally thank the organizers D. Berman, J. Conlon, N. Lambert, S. Mukhi and F. Quevedo of the program “Mathematics and Applications of Branes in String and M-theory” at the Isaac Newton Institute, Cambridge for support and hospitality during the final stages of this work.

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