Overview

"This text revolves around a new and unusual view on the most fundamental puzzle of physics. It focusses on the key aspect that makes the role of the time dimension fundamentally different: causality. It deals on the one hand with general relativity, and on the other hand with quantum theory. The implicit and intuitive way by which causality is usually taken for granted is just made explicit and less self-evident, shedding a new light on the gravity-quantum conflict. The case is made that gravity is a necessary condition for a causal universe. But upon turning to the ""pure"" unitary quantum physics explaining the nature of matter one is dealing with the strictly a-causal time expressed through the thermal quantum field theory machinery. When this a-causal microscopic and causal macroscopic world meet, one encounters the wavefunction collapse, that itself may be rooted in the quantum-gravity conflict. Modern ideas are discussed resting on eigenstate thermalization showing how this may lie eventually at the origin of irreversible thermodynamics, with its famous second law setting also a direction of time. The case is anchored in the sophisticated modern mathematical machinery of both general relativity and quantum physics which is normally barely disseminated beyond the theoretical physics floors. The book is unique in the regard that the consequences of this machinery - Riemannian geometry and Penrose diagrams, thermal quantum fields, quantum non-equilibrium and so forth -- are explained in an original, descriptive language conveying the conceptual consequences while avoiding mathematical technicalities."

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9780198920779

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Reviews

This book contains a cogent presentation on the principle of time in physics. It traces time as it appears in quantum mechanics and general relativity and weaves the story of time as it unfolds 3 separate branches of physics, non-equilibrium thermodynamics being the third one. * Philip Phillips, University of Illinois at Urbana Champaign * Scientists have struggled with the role of time for as long as science exists, and this book provides a welcome fresh twist on the story by staging the problem in terms of causality. * Jasper van Wezel, University of Amsterdam * Zaanen has a wonderfully engaging writing style, and the reader is quickly drawn into his swirling orbit of ideas, intrigued, confused, enthralled, but never bored. … Zaanen's book is at its best presenting numerous topics in current theoretical physics research for a general audience, most of which have never really been presented in this manner before: Feynman path integrals, imaginary time, Riemannian geometry, general relativity, quantum mechanics, thermodynamics, unitarity, black holes. * Subir Sachdev, Harvard University *

Author Information

"Jan Zaanen obtained his PhD in physics at Groningen University in the Netherlands, 1986. He was subsequently employed at the Max-Planck-Institute in Stuttgart, Germany, then moved in 1990 to Bell laboratories, Murray Hill, USA as a long-term visitor of the theory group. He returned to Leiden University in the Netherlands in 1993 where he got appointed as full Professor in Theoretical Physics in 2000. He became well known for his various groundbreaking discoveries in this field, honored by a Spinoza (""Dutch Nobel"") prize, a fellowship of the Dutch Royal Academy (KNAW) and visiting professorships at Stanford University, the Ecole Normale Superieur in Paris and the Solvay Institute in Brussels."

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