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    Reinoud Jan Slagter and Zoltan Keresztes (Editors), Spacetime 1909-2019. Selected peer-reviewed papers presented at the Second Hermann Minkowski Meeting on the Foundations of Spacetime Physics, dedicated to the 110th anniversary of the publication of Minkowski's paper "Space and Time," 13-16 May 2019, Albena, Bulgaria   (Minkowski Institute Press, Montreal 2020). 218 pages.

ISBN: 978-1-927763-55-1 (ebook): $5
ISBN: 978-1-927763-54-4 (softcover): $18.00

Published 16 October 2020

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This proceeding of the Second Hermann Minkowski Meeting on the Foundations of Spacetime Physics, held in 2019, is a continuation of the abundant tradition of the Hermann Minkowski Institute for Foundational Studies. Ontological and fundamental questions in theoretical physics are reviewed by three main categories, i. e., new aspects of black hole physics, fundamental aspects of spacetime and gravity from a different point of view. Firstly, this volume aims to provide some new insights in the fundamental difficulties one encounters in the description of the spinning black hole spacetime. In general, the final stage of a black hole is far from understood. It is believed that quantum effects will dominate the evaporation of the black hole by Hawing radiation. However, the maximally extended Penrose diagram of the black hole is not understood. Is there an inside of the black hole? One can modify gravity, alter the dimension of spacetime or add conformal invariance as a new symmetry in order to get new insights. Secondly, the conceptual aspects of the ontological state of the universe from first principles are considered. Issues in Minkowski spacetime like pure states, entangled states, Lorentz transformations and the notion of time are reconsidered. They interface with philosophy. In order to formulate the “laws of nature”, one needs unambiguity, simplicity, efficiency and finiteness. Other aspects, such as locality and spacetime slicing, are presented. Thirdly, this volume ends with some new ideas on quantization of spacetime and an application of transition state theory to spacetime flow. Conclusively, this volume will be of interest to researchers working in the field of conceptual aspect of spacetime and general relativity.

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