John Wheeler. “Our true nature is that simple and undeniable presence of awareness in which all thinking, feeling and perceiving occurs. Always present and. John Wheeler - Sailor Bob Adamson - ebook - Awakening to the Natural State ( complete).pdf - Download as PDF File .pdf) or view presentation slides online. John Archibald Wheeler * t. Abstract. This report reviews what quantum physics and information theory have to tell us about the age-old question, How come.
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John Wheeler. On quantum theory and information. Paul Ehrenfest's photograph of Bohr and. Einstein (shown at left) is courtesy of the. AIP Emilio Segré Visual. PDF | This essay highlights the scientific vision of John Archibald Wheeler, a giant of 20th century physics. His ideas provided the important. PDF | During the conference on the methods of differential geometry in physics in John Wheeler would now surely add more about black holes in nuclei of.
The question of what is true is, of course, invariably a binary one — in answering it, we must choose between true and false. A little more than a decade later, the great theoretical physicist John Archibald Wheeler July 9, —April 13, enriched this idea in a concept he called It from Bit. Wheeler first presented his It from Bit notion at a Santa Fe Institute conference in the spring of I, like other searchers, attempt formulation after formulation of the central issues and here present a wider overview, taking for working hypothesis the most effective one that has survived this winnowing: It from Bit.
Otherwise put, every it — every particle, every field of force, even the spacetime continuum itself — derives its function, its meaning, its very existence entirely — even if in some contexts indirectly — from the apparatus-elicited answers to yes or no questions, binary choices, bits. It from Bit symbolizes the idea that every item of the physical world has at bottom — at a very deep bottom, in most instances — an immaterial source and explanation; that what we call reality arises in the last analysis from the posing of yes-no questions and the registering of equipment-evoked responses; in short, that all things physical are information-theoretic in origin and this is a participatory universe.
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Tipler, Oxford, U. Clarendon Press, Wilczek F. Wheeler willingly went to work first on the American atomic bomb, and later the hydrogen bomb. He was a complex person: a patriot, he was offended by criticism of US military policy, for example in Vietnam. But he also encouraged one of us, Bill Unruh, to go to the University of California, Berkeley — he said that the many protests there at the time made it a stimulating place to work.
In , Wheeler turned his attention to gravity. Could the malleable space-time of Einstein's general theory of relativity explain the characteristics of elementary particles? The rich harvest of physics and mathematics was displayed in the monumental treatise Gravitation, written with two former students of his, Charles Misner and Kip Thorne.
First published in , it has not been out of print since. One problem emphasized by the book was that of singularities. When a massive star exhausts its supply of nuclear fuel, it can collapse first to a 'black hole' — as Wheeler named it — and within that into a singularity where space and time cease to exist.
As Gravitation was being published, another of Wheeler's students, Jacob Bekenstein, argued that black holes have thermodynamic properties such as energy and entropy. Three years later, Stephen Hawking showed that they have a temperature, emit radiation at that temperature, and so can evaporate.
The strong observational evidence for black holes keeps Wheeler's fundamental questions alive — what is the meaning of a singularity; what is left after a black hole evaporates; what happens to information that is swallowed by a black hole. He was especially fascinated by the idea that whether, looking at light, you see wave or particle behaviour depends on what experiment you perform.
In a famous thought experiment, Wheeler considered what happened if the choice of experiment could be delayed until, assuming causality, it was too late for the decision to affect the way the light behaves.