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Quantum GravityThird Edition$
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Claus Kiefer

Print publication date: 2012

Print ISBN-13: 9780199585205

Published to Oxford Scholarship Online: May 2012

DOI: 10.1093/acprof:oso/9780199585205.001.0001

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Why quantum gravity?

Why quantum gravity?

Chapter:
(p.1) 1 Why quantum gravity?
Source:
Quantum Gravity
Author(s):

Claus Kiefer

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199585205.003.0001

This introductory chapter presents the general motivations for constructing a quantum theory of gravity. The main argument is the conceptual incompleteness of present theoretical physics. The chapter presents the relevant length and energy scales, that is, the Planck scales and its relation to astrophysical scales, and addresses the experimental status of the relation between quantum theory and gravity. It then discusses the semiclassical Einstein equations and their shortcomings. The chapter concludes with an overview of the main approaches to quantum gravity discussed in this book. This chapter is written in a rather general and non-technical style and should be accessible to a wide audience of people interested in theoretical physics.

Keywords:   General motivation, Planck scale, neutron and atom interferometry, quantum field theory in curved spacetime, semiclassical Einstein equations, gedanken experiments

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