From Quantum to Classical

1. Front Matter

   Pages i-xiv

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2. H. Dieter Zeh and the History of the Foundations of Quantum Mechanics

   • Kristian Camilleri

   Pages 1-21

3. Emergence of the Classical World from Within Our Quantum Universe

   • Wojciech Hubert Zurek

   Pages 23-44

4. Decoherence: From Interpretation to Experiment

   • Maximilian Schlosshauer

   Pages 45-64

5. Experimental Decoherence in Molecule Interferometry

   • Markus Arndt, Stefan Gerlich, Klaus Hornberger

   Pages 65-83

6. When Zeh Meets Feynman: How to Avoid the Appearance of a Classical World in Gravity Experiments

   • Markus Aspelmeyer

   Pages 85-95

7. Preferred Basis, Decoherence and the Quantum State of the Universe

   • Andrei O. Barvinsky, Alexander Yu. Kamenshchik

   Pages 97-120

8. Wave Function First—H. D. Zeh and the Foundations of Physics

   • Heinrich Päs

   Pages 121-134

9. Geometrodynamics as Functionalism About Time

   • Henrique Gomes, Jeremy Butterfield

   Pages 135-178

10. Quantum Hierarchical Systems: Fluctuation Force by Coarse-Graining, Decoherence by Correlation Noise

    • Bei-Lok Hu

    Pages 179-215

11. Decoherence and the Puzzle of Quantum Brownian Motion in a Gas

    • Lajos Diósi

    Pages 217-224

12. On the Statistical Viewpoint Concerning the Second Law of Thermodynamics—A Reminder on the Ehrenfests’ Urn Model

    • Domenico Giulini

    Pages 225-242

13. Explanation, the Progress of Physical Theories and Computer Simulations

    • Ion-Olimpiu Stamatescu

    Pages 243-288

14. Searching for Dieter Zeh

    • Peter Byrne

    Pages 289-305

Quantum theory is at the foundation of the physical description of our world. One of the people who contributed significantly to our conceptual understanding of this theory was Heinz-Dieter Zeh (1932-2018).  He was the pioneer of the process of decoherence, through which the classical appearance of our world can be understood. This volume presents a collection of essays dedicated to his memory, written by distinguished scientists and scholars. They cover all aspects of the interpretation of quantum theory in general and the quantum-to-classical transition in particular. This volume provides illuminating reading to anyone seeking a deep understanding of quantum theory and its relevance to the foundations of physics.

• Foundations of Quantum Theory
• Quantum to Classical transition
• Decoherence theory
• Interpretation of Quantum Theory
• Unterstanding Quantum theory
• Foundations of Physics
• Dieter Zeh in Memoriam
• Many Worlds interpretation
• Quantum measurement problem

• Institute for Theoretical Physics, University of Cologne, Köln, Germany

  Claus Kiefer

Claus Kiefer is a professor of theoretical physics at the University of Cologne. He does research on quantum gravity and the foundations of quantum theory as well as studying black holes and more general cosmological questions. In 2009, his essay, "Does Time Exist in Quantum Gravity?", was awarded second prize by the Foundational Questions Institute, New York. In 2012, his essay, "Can Effects of Quantum Gravity Be Observed in the Cosmic Microwave Background?" (written together with Manuel Krämer), was awarded first prize by the Gravity Research Foundation, Wellesley Hills, USA.