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The Shadow of the Black Hole$
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John W. Moffat

Print publication date: 2020

Print ISBN-13: 9780190650728

Published to Oxford Scholarship Online: June 2020

DOI: 10.1093/oso/9780190650728.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 27 July 2021

Alternative Gravitational Theories

Alternative Gravitational Theories

(p.146) 9 Alternative Gravitational Theories
The Shadow of the Black Hole

John W. Moffat

Oxford University Press

There have been many proposed modifications of gravitational theory, beginning with Einstein’s general relativity, modifying Newtonian gravity, and Weyl’s attempt at unifying gravity and electromagnetism. The standard model of cosmology, the Lambda CDM model, requires dark matter and dark energy to fit experimental data. There is a lack of direct evidence for dark matter and dark energy. An alternative theory called modified gravity (MOG) seeks to fit the observational data for the dynamics of galaxies and clusters of galaxies without dark matter. The MOG gravitational theory has a solution for a black hole that modifies the Schwarzschild and Kerr solutions, and can be tested using the data collected on supermassive black holes by the Event Horizon Telescope. There are many modified gravity theories proposed to explain the accelerating expansion of the universe, generally ascribed to dark energy. However, Einstein’s cosmological constant is the simplest explanation for the accelerating expansion.

Keywords:   modified gravity, unified theory, MOG, dark matter, dark energy, cosmological constant, modified black hole

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