Dyson was recruited by the Federal government as a civilian to help set up the procurement and record keeping for the Lend Lease Program.

A Dyson sphere is a hypothetical megastructure originally described by Freeman Dyson.

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.

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 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 ".

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.

Military test pilots and former childhood friends, loose cannon Isamu Alva Dyson and the Zentradi mixed race Guld Goa Bowman, are selected to each pilot a new aircraft ( Shinsei Industries ' YF-19 & General Galaxy's YF-21 ) for Project Super Nova, to choose the newest successor to the VF-11 Thunderbolt variable fighter which is currently still in use by the U. N. Spacy military forces.

Dyson says that the report showed that even from a narrow military point of view the US was better off not using nuclear weapons.

This proved to be the case, with Bruce Laird, John Dyson and Graeme Wood better established as openers.

Dyson speculated that such structures would be the logical consequence of the long-term survival and escalating energy needs of a technological civilization, and proposed that searching for evidence of the existence of such structures might lead to the detection of advanced intelligent extraterrestrial life.

Deployment of spacecraft and satellites using photovoltaics might be seen as the first small steps towards building a Dyson swarm ( see below for differences between these sub-types ).

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.

However, in 2006 Dyson himself confirmed that the diagrams should be called Feynman diagrams because " he taught us how to use them ".

This idea proved influential, serving as an alternative to a full Dyson Sphere that required fewer assumptions ( such as artificial gravity ) and allowed a day / night cycle to be introduced ( through the use of a smaller ring of " shadow squares ", rotating between the ring and its sun ).

Using Wick theorem on the terms of the Dyson series, all the terms of the S-matrix for quantum electrodynamics can be computed through the technique of Feynman diagrams.

With Jones occupying Wycheck, quarterback Steve McNair would pass the ball to Dyson, who would be open from about five yards out for the score.

Dyson's eternal intelligence concept ( the Dyson Scenario ) states that intelligent beings would be able to think an infinite number of thoughts in an open universe.

Orion is one of very few interstellar space drives that could theoretically be constructed with available technology, as discussed in a 1968 paper, Interstellar Transport by Freeman Dyson.

The ring can be viewed as a functional version of a Dyson sphere with the interior surface area of 3 million Earth-sized planets.

Because it is only a partial Dyson sphere, it can be viewed as an intermediary between Type I and Type II.

Linthwaite is believed to be the place where the " Dyson " surname was founded in 1316.

The Cyclone vacuum cleaner inventor James Dyson for example could be considered to be in this category.

It began to be argued that digitality or what Esther Dyson referred to as " being digital " had emerged as a separate condition from postmodernity.

Freeman Dyson has shown that these infinities are of a basic nature and cannot be eliminated by any formal mathematical procedures, such as the renormalization method.

Many further results may be obtained, such as Fermi's golden rule, which relates the rate of transitions between quantum states to the density of states at particular energies, and the Dyson series, obtained by applying the iterative method to the time evolution operator, which is one of the starting points for the method of Feynman diagrams.

Time dependent perturbations can be treated with the technique of Dyson series.

that can be solved through the above Dyson series as

Oppenheimer rewarded Dyson with a lifetime appointment at the Institute for Advanced Study, " for proving me wrong ," Oppenheimer said.

Freeman Dyson showed that the imperviousness of solid matter is due to quantum degeneracy pressure rather than electrostatic repulsion as had been previously assumed.

It was often stated, that it is more possible to build a 2-gigaton Dyson sphere than a laser rifle, but still ringworlds etc.

Its purpose was to show that Mrs. Dyson had been on more intimate terms with Peace than she was ready to admit, and that Dyson had been shot by Peace in the course of a struggle, in which the former had been the aggressor.

The range was decorated in the usual bright Dyson colours, rather than the traditional white, grey or black of most other machines.

Finally, the resulting jets would spiral outward from the star's equator rather than emerging straight from the poles ; this could complicate harvesting it, as well as the arrangement of the Dyson sphere powering the system.

Despite the swing against Labour at that election, Dyson won her new electorate of Port Hills with an increased margin than that of Banks Peninsula.

In his book Disturbing the Universe ( 1979 ), Dyson contemplated how humanity could build a small, self-replicating automaton that could explore space more efficiently than a manned craft could.

Kei and Yuri, disguised as a pregnant Shasti and an overweight male model, with EPD ( Explosive Personality Disorder ) Eddie, travel to the covert trade and technology nexus of the Nimkasi, a Dyson tree habitat, where the 3WA have scored a deal with the Black Market habitat to poach 50 of the worst " crims, terrs, and pirates " from its megatree branches, in less than 100 minutes.