Freeman John Dyson (15 December 1923 – 28 February 2020) was a British-American theoretical physicist and mathematician.
Freeman John Dyson (15 December 1923 – 28 February 2020) was a British-American theoretical physicist and mathematician. ◦
He was known for his works in quantum field theory, astrophysics, random matrices, the mathematical formulation of quantum mechanics, condensed matter physics, nuclear physics, and engineering. ◦
Friends and colleagues described him as shy and self-effacing, with a contrarian streak. ◦
He described himself as a frog, not a bird, as he enjoyed jumping from pool to pool, studying their details deeply in the mud. ◦
Dyson wrote that science is an alliance of free spirits in all cultures rebelling against the local tyranny that each culture imposes on its children. ◦
He added that if science ceases to be a rebellion against authority, then it does not deserve the talents of our brightest children. ◦
He held that there is no such thing as a unique scientific vision, any more than there is a unique poetic vision, and that science is a mosaic of partial and conflicting visions. ◦
He saw the common element in these visions as rebellion against the restrictions imposed by the locally prevailing culture. ◦
His friend Oliver Sacks said that a favourite word of Freeman's about doing science and being creative is the word "subversive," and that Dyson feels it is rather important not only to be not orthodox, but to be subversive, and that he has done that all his life. ◦
He maintained a lifelong suspicion of grand unified theories. ◦
Dyson described himself as a frog, not a bird, as he enjoyed jumping from pool to pool, studying their details deeply in the mud, and the bird's-eye perspective was not for him. ◦
After his most famous achievement came early as a theoretical physicist, he moved into the design of nuclear reactors, nuclear-powered space travel, astronomy, astrobiology, climate change and futurism. ◦
In the summer of 1948, while traveling by Greyhound bus from San Francisco to Princeton, Dyson had an epiphany that united Feynman's diagrams with Schwinger's abstract algebra. ◦
He believed that the great advances in science usually result from new tools rather than from new doctrines. ◦
He held that every new tool leads to new and unexpected discoveries, citing how black holes, pulsars, and quasars were utterly unanticipated until tools revealed them. ◦
Dyson saw science as a mosaic of partial and conflicting visions. ◦
On reductionism, he wrote: "This was how the philosophy of reductionism led Oppenheimer and Einstein astray... They were entranced by the dream of solving all the basic problems at once. And as a result, they failed in their later years to solve any problems at all." ◦
He warned that the real world is muddy and messy and full of things that we do not yet understand. ◦
He held that nature's imagination is always richer than ours. ◦
Dyson was a theoretical physicist and mathematician known for his works in quantum field theory, astrophysics, random matrices, the mathematical formulation of quantum mechanics, condensed matter physics, nuclear physics, and engineering. ◦
In 1949, he demonstrated the equivalence of two formulations of quantum electrodynamics: Richard Feynman's diagrams and the operator method developed by Julian Schwinger and Shin'ichiro Tomonaga. ◦
He was the first person after their creator to appreciate the power of Feynman diagrams, and his paper presented Feynman's theories of QED in a form that other physicists could understand. ◦
He later moved into the design of nuclear reactors, nuclear-powered space travel, astronomy, astrobiology, climate change and futurism. ◦
He considered the black hole incomparably the most exciting and the most important consequence of general relativity, stating that black holes are the places in the universe where general relativity is decisive. ◦
Friends and colleagues described Dyson as shy and self-effacing. ◦
Steven Weinberg said of him: "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." ◦
Dyson described Richard Feynman as "half genius and half buffoon." ◦
Dyson combined a shy, self-effacing demeanor with a contrarian streak, and Steven Weinberg noted that when consensus is forming like ice hardening on a lake, Dyson will do his best to chip at the ice. ◦
He argued that "all the fuss about global warming is grossly exaggerated" and warned against over-reliance on computer climate models, writing that it is easier for a scientist to run computer models than to measure what is really happening outside. ◦
He wrote that intelligent land-management increasing the topsoil carbon reservoir is "a theoretical possibility and ought to be seriously explored," framing carbon dioxide as a problem to be addressed through biology and soil rather than only through emissions cuts. ◦
While he achieved his most famous work early in theoretical physics, he maintained a lifelong suspicion of grand unified theories and preferred the frog's detail-oriented perspective to the bird's-eye view. ◦
Dyson found great satisfaction in building good tools for other people to use. ◦
He valued subversive, unorthodox thinking, and his friend Oliver Sacks reported that Dyson feels it is rather important not only to be not orthodox, but to be subversive. ◦
He viewed science as a rebellion against the restrictions imposed by the locally prevailing culture. ◦