Andriyash, EvgenyDenef, FrederikJafferis, DanielMoore, Gregory W.2012-02-242012Andriyash, Evgeny, Frederik Denef, Daniel Louis Jafferis, and Gregory W. Moore. 2012. Wall-crossing from supersymmetric galaxies. Journal of High Energy Physics 2012(1): 115.1029-8479http://nrs.harvard.edu/urn-3:HUL.InstRepos:8249646We give an elementary physical derivation of the Kontsevich-Soibelman wall crossing formula, valid for any theory with a 4d N = 2 supergravity description. Our argument leads to a slight generalization of the formula, which relates monodromy to the BPS spectrum.en-USblack holesstring theoryD-braneshigh energy physicsdifferential geometryalgebraic geometryJournal Article2012-02-2410.1007/JHEP01(2012)115