geons black holes and quantum foam a life in physics pdf file Thursday, May 13, 2021 12:55:50 AM

Geons Black Holes And Quantum Foam A Life In Physics Pdf File

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Illustration by Steven Veach I am an utterly irrational sucker for physics.

For years, the standard model of cosmology has been an acceptable framework to account for many observed phenomena. Nevertheless, it ought be modified due to the challenging problems such as singularity [ 1 ], flatness [ 2 ], horizon [ 3 ], small-scale inhomogeneity [ 4 ], entropy [ 5 ], monopole [ 6 ], cosmological constant [ 7 ], [ 8 ], and age [ 9 ]. Most important of all, however, is the unified description of quantum and gravity theories. The model was originally formulated in an attempt to discuss the pre-de-Sitter in terms of quantum mechanics.

The Pursuit of Quantum Gravity

These fundamental concepts provide the structure for Quantum Questions, an authoritative yet engaging book for the general reader in which every question and answer brings out one or more basic features of the mysterious world of the quantum—the physics of the very small. Nuclear researcher and master teacher, Ford covers everything from quarks, quantum jumps, and what causes stars to shine, to practical applications ranging from lasers and superconductors to light-emitting diodes.

Organized for cover-to-cover reading, Quantum Questions also is great for browsing. Some books focus on a single subject such as the standard model of particles, or string theory, or fusion energy. This book touches all those topics and more, showing us that disparate natural phenomena, as well as a host of manmade inventions, can be understood in terms of a few key ideas. Yet Ford does not give us simplistic explanations. He assumes a serious reader wanting to gain real understanding of the essentials of quantum physics.

Ken Ford's other books include The Quantum World: Quantum Physics for Everyone Harvard , which Esquire magazine recommended as the best way to gain an understanding of quantum physics. Ford's new book, a sequel to the earlier one, makes the quantum world even more accessible. Kenneth W. EN English Deutsch. Your documents are now available to view.

Confirm Cancel. Kenneth William Ford. Harvard University Press Author information FordKenneth W. Ford, K. Ford, Kenneth William. Ford K. Copy to clipboard. Log in Register. Full Access. Section I. Section II. Section III. Section IV. Section V. Section VI. Section VII. Section VIII. Section IX. Section X. Section XI. Section XII. Section XIII. Section XIV. Section XV.

John Archibald Wheeler

Wheeler also worked with Niels Bohr in explaining the basic principles behind nuclear fission. He is best known for using the term " black hole " for objects with gravitational collapse already predicted during the early 20th century, for inventing the terms " quantum foam ", " neutron moderator ", " wormhole " and " it from bit ", and for hypothesizing the " one-electron universe ". During he collaborated with Bohr to write a series of papers using the liquid drop model to explain the mechanism of fission. He returned to Princeton after the war ended, but returned to government service to help design and build the hydrogen bomb in the early s. For most of his career, Wheeler was a professor of physics at Princeton University , which he joined in , remaining until his retirement in

Work fast with our official CLI. Learn more. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. If they exist, why we haven't observed one hole yet?

Quantum foam or spacetime foam is the quantum fluctuation of spacetime on very small scales due to quantum mechanics. The idea was devised by John Wheeler in With an incomplete theory of quantum gravity , it is impossible to be certain what spacetime would look like at small scales. However, there is no reason that spacetime needs to be fundamentally smooth. It is possible that instead, in a quantum theory of gravity, spacetime would consist of many small, ever-changing regions in which space and time are not definite, but fluctuate in a foam-like manner. Wheeler suggested that the Heisenberg uncertainty principle might imply that over sufficiently small distances and sufficiently brief intervals of time, the "very geometry of spacetime fluctuates". In the two MAGIC Major Atmospheric Gamma-ray Imaging Cherenkov telescopes detected that among gamma-ray photons arriving from the blazar Markarian , some photons at different energy levels arrived at different times, suggesting that some of the photons had moved more slowly and thus contradicting the theory of general relativity's notion of the speed of light being constant, a discrepancy which could be explained by the irregularity of quantum foam.

Geons, black holes, and quantum foam : a life in physics

The Tao of It and Bit. Wheeler, at 5 years after his death. This gives the observer a participatory role in deciding the past history of the universe.

It from bit?

Geons, Black Holes, and Quantum Foam

This article is part of our Information about information project , run in collaboration with FQXi. Click here to read other articles related to John Wheeler's concept of "it from bit". If a tree falls in the woods and no one is there to hear it, does it make a sound? Do things only exist if they are perceived? What does physics tell us about reality?

These fundamental concepts provide the structure for Quantum Questions, an authoritative yet engaging book for the general reader in which every question and answer brings out one or more basic features of the mysterious world of the quantum—the physics of the very small. Nuclear researcher and master teacher, Ford covers everything from quarks, quantum jumps, and what causes stars to shine, to practical applications ranging from lasers and superconductors to light-emitting diodes. Organized for cover-to-cover reading, Quantum Questions also is great for browsing. Some books focus on a single subject such as the standard model of particles, or string theory, or fusion energy. This book touches all those topics and more, showing us that disparate natural phenomena, as well as a host of manmade inventions, can be understood in terms of a few key ideas.

How come existence? We will first understand how simple the universe is when we recognize how strange it is. Bohr—with whom I had worked a few years earlier—was coming to give some lectures at the Institute for Advanced Study in Princeton and spend time with his friend Albert Einstein, then a professor at the Institute, and I had decided to greet him. For a dozen years, Bohr and Einstein, probably the two most eminent physicists in the world at that time, had had a running debate on the meaning and interpretation of quantum mechanics, the subtle theory that governs motion and change in the subatomic realm. Bohr held that uncertainty and unpredictability are intrinsic features of the theory, and therefore of the world in which we live.


The autobiography of one of the preeminent figures in twentieth-century physics. He studied with Niels Bohr, taught Richard Feynman, and boned up on relativity.


Quantum Gravity was his goal and remained his goal throughout his lifetime until the very end. Vilkovisky commented , "Quantum Gravity is a combination of two words, and one should know both. Bryce understood this as nobody else, and this wisdom is completely unknown to many authors of the flux of papers that we see nowadays.

Quantum foam

1 Comments

Mengonomi 18.05.2021 at 03:28

To read the full-text of this research, you can request a copy directly from the authors. Request full-text PDF.

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