In life and work, Claudio Bunster (formerly Teitelboim) prefers extreme challenges. Bunster, a physicist who contemplates brain-warping theories of space and time, returned to his native Chile from the United States precisely when most intellectuals would have stayed clear- during the middle of the Pinochet dictatorship (K. Mossman, Proceedings of the National Academy of Sciences)

Against this backdrop, Bunster founded the Centro de Estudios Científicos (CECS), a world class institute for frontier science research in Chile. His mentor, John A. Wheeler often used Teddy Roosevelt's advice, "Do what you can, where you are, with what you have." "I followed his advice," said Bunster. "At latitude 40°S there is a science institute where one can find the footprints of Wheeler in every corner."

As a true pioneer, Bunster was ahead of his time, opening roads, pushing the frontiers, under extreme conditions, in unexplored environments. Throughout his career, black holes, monopoles, the Antarctic vastness and the entire universe, have been the objects of his fascination: extreme, simple objects where beauty is best captured and displayed.

On 10 and 11 January 2008, the meeting Quantum Mechanics of Fundamental Systems: The Quest for Beauty and Simplicity -Claudio's Fest took place in Valdivia to celebrate Claudio Bunster's 60th birthday. This volume collects the contributions that were discussed at this meeting by many of Bunster's colleagues and longtime collaborators. Articles by L. Brink, S. Carlip, F. Englert, S. Hawking, M. Henneaux, C.W. Misner and L. Susskind, among others, highlight the broad impact of Bunster, providing unique insightful views on many topics addressed by him in his scientific career, ranging from black holes and symmetries in gravity and supergravity, to cosmology.

The meeting was co-organized by the CECS and the International Solvay Institutes.

Résumé
This article is dedicated to Claudio Bunster on the occasion of his 60th birthday. It is a great honor to take this opportunity to express my gratitude to him, who in my opinion has been the greatest national physicist ever, for his wise guidance and intrepid support through the years. As a Chilean, I can further tell that Claudio's contributions have been well far beyond theoretical physics, helping our country to be ready to face future challenges through science. Gravity in diverse dimensions is a subject in which Claudio has done major c- tributions, encouraging in many ways the following work, that is being made along different fronts in collaboration with my colleagues Diego Correa, Gustavo Dotti, Julio Oliva and David Tempo. Thepursuitforwormholesolutions,whicharehandlesinthespacetimetopology, it is as old as General Relativity and it has appeared in theoretical physics within different subjects, ranging from the attempt of describing physics as pure geometry, as in the EinsteinRosen bridge model of a particle [1], to the concept of charge withoutcharge[2],aswell asindifferentissuesconcerningthe Euclideanapproach to quantum gravity (see, e.g., [3]). More recently, the systematic study of this kind of objects was pushed forward by the works of Morris, Thorne and Yurtsever [4,5].

Contenu
OPENING REMARKS.- Recorded in Santa Barbara.- Opening.- CONTRIBUTED PAPERS.- On the Symmetries of Classical String Theory.- Eddington-Born-Infeld Action and the Dark Side of General Relativity.- Maximal Supersymmetric Theories and E7(7) in Light-Cone Superspace.- Strongly Hyperbolic Extensions of the ADM Hamiltonian.- Black Hole Entropy and the Problem of Universality.- Sources for Chern-Simons theories.- The Emergence of Fermions and The E Content.- Why did the Universe Inflate?.- Kac-Moody algebras and the structure of cosmological singularities: a new light on the Belinskii-Khalatnikov-Lifshitz analysis.- Black holes with a conformally coupled scalar field.- Quantum Mechanics on some Supermanifolds.- John Wheeler's Quest for Beauty and Simplicity.- Magnetic Monopoles in Electromagnetism and Gravity.- The Census Taker's Hat.- Static wormholes in vacuum and gravity in diverse dimensions.- CLOSING.- Claudio Bunster: A personal recollection.- Profile of Claudio Bunster.