Bergshoeff, E.Eyras, E.Halbersma, R.Van der Schaar, J. P.Hull, C. M.Lozano, Y.2025-05-302025-05-300550-3213ORCID:/0000-0003-0793-6218/work/162948963http://www.scopus.com/inward/record.url?scp=0034598231&partnerID=8YFLogxKhttps://hdl.handle.net/1885/733754974We discuss branes whose world-volume dimension equals the target space-time dimension, i.e. "space-time-filling branes". In addition to the D9-branes, there are 9-branes in the NS-NS sectors of both the IIA and IIB strings. The world-volume actions of these branes are constructed, via duality, from the known actions of branes with codimension larger than zero. Each of these types of branes is used in the construction of a string theory with sixteen supercharges by modding out a Type II string by an appropriate discrete symmetry and adding 32 9-branes. These constructions are related by a web of dualities and each arises as a different limit of the Hořava-Witten construction.We would like to thank M. Green, L. Huiszoon, D. Matalliotakis, N. Obers, B. Pioline and M. de Roo for useful discussions. E.B. likes to thank A. Karch for a useful discussion about the relation with the Hořava–Witten picture. E.B., C.M.H. and Y.L. would like to thank the organizers and participants of the 1998 Amsterdam Summer Workshop on String Theory and Black Holes for providing a stimulating environment. The work of E.B. is supported by the European Commission TMR program ERBFMRX-CT96-0045, in which E.B. is associated to the University of Utrecht. The work of E.E, R.H. and J.P.v.d.S. is part of the research program of the “Stichting voor Fundamenteel Onderzoek der Materie” (FOM). The work of C.M.H. is supported by an EPSRC senior fellowship.31enBranesDualitiesStrings2000-01-0310.1016/S0550-3213(99)00483-60034598231