Nonlocal Gravity
Bahram Mashhoon
Mey 2017 · International Series of Monographs on Physics Ibhuku elingu-167 · Oxford University Press
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Relativity theory is based on a postulate of locality, which means that the past history of the observer is not directly taken into account. This book argues that the past history should be taken into account. In this way, nonlocality---in the sense of history dependence---is introduced into relativity theory. The deep connection between inertia and gravitation suggests that gravity could be nonlocal, and in nonlocal gravity the fading gravitational memory of past events must then be taken into account. Along this line of thought, a classical nonlocal generalization of Einstein's theory of gravitation has recently been developed. A significant consequence of this theory is that the nonlocal aspect of gravity appears to simulate dark matter. According to nonlocal gravity theory, what astronomers attribute to dark matter should instead be due to the nonlocality of gravitation. Nonlocality dominates on the scale of galaxies and beyond. Memory fades with time; therefore, the nonlocal aspect of gravity becomes weaker as the universe expands. The implications of nonlocal gravity are explored in this book for gravitational lensing, gravitational radiation, the gravitational physics of the Solar System and the internal dynamics of nearby galaxies, as well as clusters of galaxies. This approach is extended to nonlocal Newtonian cosmology, where the attraction of gravity fades with the expansion of the universe. Thus far, scientists have only compared some of the consequences of nonlocal gravity with astronomical observations.
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Bahram Mashhoon has spent his academic career working on relativity and gravitation. This book is the culmination of his work at the University of Missouri in Columbia over the past thirty years. He completed his Ph.D. at Princeton University under the supervision of John A. Wheeler. As an undergraduate, he attended the University of California at Berkeley, where he was mentored in physics by Emilio G. Segrè. Born in Tehran, Mashhoon left Iran in 1966 to study physics in the US.
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