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Black holes

Ta-Pei Cheng

in Relativity, Gravitation and Cosmology: A Basic Introduction

Published in print:
2009
Published Online:
February 2010
ISBN:
9780199573639
eISBN:
9780191722448
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780199573639.003.0008
Subject:
Physics, Particle Physics / Astrophysics / Cosmology

Black hole is an object so compact that it is inside its event horizon: a one-way surface through which particle and light can only traverse inward, and an exterior observer cannot receive any signal ... More


Wormholes, Time Travel, and Other Exotic Theories

John W. Moffat

in The Shadow of the Black Hole

Published in print:
2020
Published Online:
June 2020
ISBN:
9780190650728
eISBN:
9780197517383
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780190650728.003.0005
Subject:
Physics, Particle Physics / Astrophysics / Cosmology

In 1935, Einstein and Rosen described what is now called the Einstein-Rosen bridge. Wheeler called this a wormhole, which could connect two distant parts of the universe. Thorne and Morris showed the ... More


Geon Wheeler

Dean Rickles

in Covered with Deep Mist: The Development of Quantum Gravity (1916-1956)

Published in print:
2020
Published Online:
April 2020
ISBN:
9780199602957
eISBN:
9780191844393
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780199602957.003.0008
Subject:
Physics, Theoretical, Computational, and Statistical Physics

This chapter focuses on John Wheeler’s work on geons and geometrodynamics which would lead to many concepts and results that would be of importance to quantum gravity research - these projects, ... More


Modes of Time Travel

Nikk Effingham

in Time Travel: Probability and Impossibility

Published in print:
2020
Published Online:
April 2020
ISBN:
9780198842507
eISBN:
9780191878480
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780198842507.003.0002
Subject:
Philosophy, Metaphysics/Epistemology

This chapter discusses the ways in which one might travel back in time. Of course, there are no actual, known instances of time travel, so the different modes are drawn from fiction, historical ... More


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