Eyras, EduardoJanssen, BertLozano, Yolanda2025-05-302025-05-300550-3213ORCID:/0000-0003-0793-6218/work/162948974http://www.scopus.com/inward/record.url?scp=0000485725&partnerID=8YFLogxKhttps://hdl.handle.net/1885/733754977We construct the explicit world-volume effective actions of the type IIB NS5-brane and KK monopole. These objects are obtained through a T-duality transformation from the IIA KK monopole and the IIA NS5-brane respectively. We show that the world-volume field content of these actions is precisely that necessary to describe their world-volume solitons. The IIB NS5-brane effective action is shown to be related to the D5-brane's by an S-duality transformation, suggesting the way to construct (p,q) 5-brane multiplets. The IIB KK monopole is described by a gauged sigma model, in agreement with the general picture for KK monopoles, and behaves as a singlet under S-duality. We derive the explicit T-duality rules NS5-brane ↔ KK, which we use for the construction of the previous actions, as well as NS5 ↔ NS5, and KK ↔ KK.We would like to thank E. Bergshoeff and T. Ortfn for useful discussions. E.E. would also like to thank R. Argurio, M. de Roo and J.P. van der Schaar for discussions. The work of E.E. and B.J. is part of the research program of the Stichting FOM. The work of Y.L. is supported by a TMR fellowship from the European Commission.27enBranesDuality1998-10-2610.1016/S0550-3213(98)00575-60000485725