The Emergent Multiverse

David Wallace was born in San Rafael, California, in 1976, but has been resident in the UK since 1977. He studied theoretical physics at Oxford University from 1994-2002, but upon realising his research interests lay mostly in conceptual and foundational aspects of physics, he moved across into philosophy of physics. For the last six years he has been Tutorial Fellow in Philosophy of Science at Balliol College, Oxford. He holds PhDs in physics and in philosophy, and his research interests span a wide range of issues on the boundary between philosophy and physics: symmetry and the gauge principle, the direction of time, the structure of quantum field theory, and of course the interpretation of quantum mechanics.

• PART I: THE PLURALITY OF WORLDS; PART II: PROBABILITY IN A BRANCHING UNIVERSE; PART III: QUANTUM MECHANICS, EVERETT STYLE; APPENDICES

The Emergent Multiverse is the most extensive, careful, and wide-ranging discussion of Hugh Everetts so-called Many Worlds interpretation of quantum theory in existence (at least on our branch of the multiverse), and is certain to become the locus classicus for all future discussions of the theory. Since the first obligation of a reviewer is to give guidance to potential readers, I will discharge that obligation first: if you have any interest in studying or trying to understand the Everett theory, you must get this book. You wont find a better discussion of both foundational issues and far-flung consequences of the theory anywhere. David Wallace has been brooding on the theory, and fielding objections to it, for over a decade. His considered views and responses are as careful and sophisticated as any on the market, and are equally attuned to physical and to philosophical issues.