Electroweak effective lagrangians

In this paper I review several aspects of the use of effective lagrangians in (mainly) electroweak physics. The conditions under which this approach is reliable and useful, as well as the limitations of the formalism are detailed. Various applications are also presented.Comment: 89 page

A short course in effective Lagrangians

These lectures provide an introduction to effective theories concentrating on the basic ideas and providing some simple applicationsComment: Lectures delivered at the VII Mexican Workshop on Particles and Fields, Merida, Yucatan, Mexico, 10-17 November, 1999. 29 pages, 8 figure

Strategies and obstacles in constructing realistic higher-dimensional models

We discuss several aspects of higher dimensional models that contain bulk gauge and fermion fields only. In particular we argue that non-standard boundary conditions involving charge-conjugate fermion fields offer attractive model building possibilities. We also discuss a no-go theorem for 5-dimensional models which severely limits their phenomenological relevance.Comment: 4 pages, 1 fugure; contribution to the SUSY06 proceeding