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A Dyson sphere is a hypothetical megastructure originally described by Freeman Dyson.
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Dyson and sphere
Since then, other variant designs involving building an artificial structure or series of structures to encompass a star have been proposed in exploratory engineering or described in science fiction under the name " Dyson sphere.
The concept of the Dyson sphere was the result of a thought experiment by physicist and mathematician Freeman Dyson, when he theorized that all technological civilizations constantly increased their demand for energy.
Dyson is credited with being the first to formalize the concept of the Dyson sphere in his 1960 paper " Search for Artificial Stellar Sources of Infra-Red Radiation ", published in the journal Science.
Some ideas to build a fixed-in-place ' Dyson sphere ' are impractical.
However, the number of crafts required to obtain, transmit, and maintain a complete Dyson sphere far exceeds our present-day industrial capabilities.
# REDIRECT Dyson sphere
Artist's concept of Dyson rings, forming a stable Dyson swarm, or " Dyson sphere ".
Dyson conceived that such structures would be clouds of asteroid-sized space habitats, though science fiction writers have preferred a solid structure: either way, such an artifact is often referred to as a Dyson sphere, although Dyson himself used the term " shell ".
Some writers have proposed building megastructures that have some similarities to a hollow Earth – see Dyson sphere, Globus Cassus.
* Dyson sphere
Science fiction writer Larry Niven has tongue-in-cheek theorized that, based on such abundance, Krypton was actually a Dyson sphere with a surface hundreds of times that of a mere planet.
* Dyson sphere
* Dyson sphere
* Rasd-Coduresa is the planetary system of her birth, and the specific object ( planet, orbital, Dyson sphere, etc .).
* Dyson sphere
* Dyson sphere — Freeman Dyson
Dyson and is
In response to letters prompted by this paper, Dyson replied, " A solid shell or ring surrounding a star is mechanically impossible.
Freeman John Dyson FRS ( born December 15, 1923 ) is a British-born American theoretical physicist and mathematician, famous for his work in quantum electrodynamics, solid-state physics, astronomy and nuclear engineering.
Dyson is a member of the Board of Sponsors of the Bulletin of the Atomic Scientists.
Despite sharing a last name, he is not related to the early 20th century astronomer Frank Watson Dyson, but as a small boy Freeman Dyson was aware of Frank Watson Dyson.
" I have the sense that when consensus is forming like ice hardening on a lake, Dyson will do his best to chip at the ice ," physics Nobel laureate Steven Weinberg said of him.
Dyson is best known for demonstrating in 1949 the equivalence of the formulations of quantum electrodynamics that existed by that time – Richard Feynman's diagrams, on the one hand, and, on the other, the operator method developed by Julian Schwinger and Sin-Itiro Tomonaga.
, Dyson is the president of the Space Studies Institute, the space research organization founded by Gerard K. O ' Neill.
Dyson is a long-time member of the JASON defense advisory group.
Dyson is a regular contributor to the New York Review of Books.
Dyson cheerfully admits his record as a prophet is mixed, but " it is better to be wrong than to be vague.
Dyson agrees that anthropogenic global warming exists, and has written that " ne of the main causes of warming is the increase of carbon dioxide in the atmosphere resulting from our burning of fossil fuels such as oil and coal and natural gas.
Dyson is well-aware that his " heresy " on global warming has been strongly criticized.
The number of times the interaction Hamiltonian acts is the order of the perturbation expansion, and the time-dependent perturbation theory for fields is known as the Dyson series.
The Dyson series can be alternately rewritten as a sum over Feynman diagrams, where at each interaction vertex both the energy and momentum are conserved, but where the length of the energy momentum four vector is not equal to the mass.
Dyson and hypothetical
A matrioshka brain is a hypothetical megastructure proposed by Robert Bradbury, based on the Dyson sphere, of immense computational capacity.
An Alderson disk ( named after Dan Alderson, its originator ) is an hypothetical artificial astronomical megastructure, like Niven's Ringworld, or a Dyson sphere.
* Dyson tree, a hypothetical tree that can grow on a comet as suggested by Freeman Dyson
A Dyson tree is a hypothetical genetically-engineered plant, ( perhaps resembling a tree ) capable of growing in a comet, suggested by the physicist Freeman Dyson.
Dyson and originally
Since originally taking interest in climate studies in the 1970s, Dyson has suggested that carbon dioxide levels in the atmosphere could be controlled by planting fast-growing trees.
* Jerry Michalski ( The Pilgrim ) managing editor of Release 1. 0, the newsletter published, and originally written and edited solely by Esther Dyson.
The work was originally self-published with illustrations by his friend and fellow Communist " Amb " Dyson, with the rubric " a novel in three parts by Frank J. Hardy, Ross Franklyn ".
Dyson and described
In his Marvin book Mercy Mercy Me: The Art, Loves and Demons of Marvin Gaye, Michael Eric Dyson described Gaye as someone " who transcended the boundaries of rhythm and blues as no other performer had done before ".
* Under the name of " Space Poplars ", Dyson trees are described in Donald Moffitt's two science fiction novels, The Genesis Quest and Second Genesis.
Dyson and by
Positions regarding existence after death were supported by some notable physicists such as Erwin Schrödinger and Freeman Dyson.
* Crank conjecture, a term coined by Freeman Dyson to explain congruence patterns in integer partitions
Robert Oppenheimer, in particular, was persuaded by Dyson that Feynman's new theory was as valid as Schwinger's and Tomonaga's.
Dyson recognized the formula as the pair correlation function of the Gaussian unitary ensemble, which has been extensively studied by physicists.
A seminal work by Dyson came in 1966 when, together with Andrew Lenard and independently of Elliott H. Lieb and Walter Thirring, he proved rigorously that the exclusion principle plays the main role in the stability of bulk matter.
Also during the 1970s, Dyson worked on climate studies conducted by the JASON defense advisory group.
The general concept of such an energy-transferring shell had been advanced decades earlier by author Olaf Stapledon in his 1937 novel Star Maker, a source that Dyson has credited publicly.
The Dyson series, the formal solution of an explicitly time-dependent Schrödinger equation by iteration, and the corresponding Dyson time-ordering operator an entity of basic importance in the mathematical formulation of quantum mechanics, are also named after Dyson.
Dyson disagrees with the famous remark by his fellow physicist Steven Weinberg that " With or without religion, good people can behave well and bad people can do evil ; but for good people to do evil — that takes religion.
*" The Question of Global Warming ", by Freeman Dyson, June 12, 2008
:* Comments on " The Question of Global Warming ", with a reply by Dyson, September 25, 2008
*" Our Biotech Future ", essay by Freeman Dyson, July 19, 2007
:* Comments on " Our Biotech Future ", with a reply by Dyson, September 27, 2007
:* Another comment on " Our Biotech Future ", with a reply by Dyson, October 11, 2007
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