23rd Solvay Physics

QcEntwn
Structure
Time
&pace and

This page intentionally left blankThis page intentionally left blank

Proceedings of the 23rd Solvay Conference on Physics
Brussels, Belgium
1 - 3 December 2005
DAVID GROSS
MARC HENNEAUX
Kavli Institute. University of California. Santa Barbara. USA
Universite Libre de Bruxelles
& International Solvay Institutes. Belgium
ALEXANDER SEVRIN
Vrije Universiteit Brussel & International Solvay Institutes. Belgium
\b World Scientific
NEW JERSEY LONOON * SINGAPORE BElJlNG * SHANGHAI HONG KONG TAIPEI * CHENNAI
The
Quantum
Structure
of
Space
and
Time
EDITORS

Published by
World Scientific Publishing Co. Re. Ltd.
5 Toh Tuck Link, Singapore 596224
USA ofJice: 27 Warren Street, Suite 401-402, Hackensack, NJ 07601
UK ofice; 57 Shelton Street, Covent Garden, London WC2H 9HE
British Library Cataloguing-in-Publication Data
A catalogue record for this hook is available from the British Library.
THE QUANTUM STRUCTURE OF SPACE AND TIME
Proceedings of the 23rd Solvay Conference on Physics
Copyright 0 2007 by World Scientific Publishing Co. Pte. Ltd.
All rights reserved. This book, or parts thereoi may not be reproduced in any form or by any means, electronic or
mechanical, including photocopying, recording or any information storage and retrieval system now known or
to
be invented, without written permission from the Publisher.
For photocopying of material in this volume, please pay a copying fee through the Copyright Clearance Center,
Inc., 222 Rosewood Drive, Danvers,
MA 01923, USA. In this case permission to photocopy is not required from
the publisher.
ISBN 981-256-952-9
ISBN 981-256-953-7 (phk)
Printed in Singapore by World Scientific Printers (S) Pte Ltd