Ooguri, HirosiVafa, Cumrun2019-09-221996Ooguri, Hirosi, and Cumrun Vafa. 1996. “Summing up Dirichlet Instantons.” Physical Review Letters 77 (16): 3296–98. https://doi.org/10.1103/physrevlett.77.3296.0031-90071079-71141092-0145http://nrs.harvard.edu/urn-3:HUL.InstRepos:41384998We investigate quantum corrections to the moduli space for hypermultiplets for the type IIA string near a conifold singularity. We find a unique quantum deformation based on symmetry arguments which is consistent with a recent conjecture. The correction can be interpreted as an infinite sum coming from multiple wrappings of the Euclidean Dirichlet branes around the vanishing cycle.en-USJournal Article2019-09-2210.1103/PhysRevLett.77.3296