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.

Sheds light on the deepest mysteries of Quantum Mechanics Authored by world-leaders in quantum theory and beyond Published in honor of Dieter Zeh, pioneer of decoherence theory

Autorentext
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.

Inhalt
H. Dieter Zeh and the History of the Foundations of Quantum Mechanics.- Emergence of the Classical World from within our Quantum Universe.- Decoherence: From Interpretation to Experiment.- Experimental decoherence in molecule interferometry.- When Zeh meets Feynman: how to avoid the appearance of a classical world in gravity experiments.- Preferred basis, decoherence and the quantum state of the Universe.- Wave Function First - H.D. Zeh and the Foundations of Physics.- Geometrodynamics as Functionalism about Time.- Quantum Hierarchical Systems: Fluctuation Force by Coarse-Graining, Decoherence by Correlation Noise.- Decoherence and the puzzle of quantum Brownian motion in a gas.- On the statistical viewpoint concerning the second law of thermodynamics a reminder on the Ehrenfests' urn model.- Explanation, the Progress of Physical Theories and Computer Simulations.- Searching for Dieter Zeh.