After almost a century, the field of quantum gravity remains as difficult and inspiring as ever. Today, it finds itself a field divided, with two major contenders dominating: string theory, the leading exemplification of the covariant quantization program; and loop quantum gravity, the canonical scheme based on Dirac's constrained Hamiltonian quantization. However, there are now a number of other innovative schemes providing promising new avenues. Encapsulating the latest debates on this topic, this book details the different approaches to understanding the very nature of space and time. It brings together leading researchers in each of these approaches to quantum gravity to explore these competing possibilities in an open way. Its comprehensive coverage explores all the current approaches to solving the problem of quantum gravity, addressing the strengths and weaknesses of each approach, to give researchers and graduate students an up-to-date view of the field.

About the Authors

Jeff Murugan is a Senior Lecturer in the Department of Mathematics and Applied Mathematics and a member of the Astrophysics, Cosmology and Gravity Centre, University of Cape Town. He is interested in all aspects of gravity and is currently working on string theory and connections between gauge theories and gravity.

Amanda Weltman is a Lecturer in the Department of Mathematics and Applied Mathematics and a member of the Astrophysics, Cosmology and Gravity Centre, University of Cape Town. She works in the exciting bridging areas of string cosmology studying physical ways to test string theory within the context of cosmology.

George F. R. Ellis is Emeritus Professor of Applied Mathematics and Honorary Research Associate in the Mathematics Department, University of Cape Town. He works on general relativity theory, cosmology, complex systems, and the way physics underlies the functioning of the human brain.

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