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Freeman John Dyson é um físico e matemático inglês.Trabalhou para o British Bomber Command durante a Segunda Guerra Mundial. Após seu fim, mudou-se para Princeton e nacionalizou-se estadounidense.

Nos anos posteriores à guerra, Dyson demonstrou a equivalência das formulações da eletrodinâmica quântica de Richard Feynman com as desenvolvidas por Julian Schwinger e Shin'ichiro Tomonaga. Entre 1957-1961, trabalhou no Projeto Orion que pretendia realizar o voo espacial utilizando a propulsão nuclear. Um protótipo chegou a ser construído, mas a Declaração para o Uso Pacífico do Espaço da ONU proibiu qualquer tipo de explosão nuclear na atmosfera e no espaço, o que provocou o abandono do projeto.

Dyson teorizou sobre a possibilidade de que uma sociedade avançada pudesse circundar completamente uma estrela para maximizar a captura da energia emitida, mediante nuvens de asteróides, o que foi denominado esfera de Dyson.

Também propôs a árvore de Dyson, uma planta desenhada geneticamente para crescer num cometa. O objetivo imaginado era que a árvore transformaria o cometa numa estrutura oca com uma atmosfera respirável no seu interior, utilizando-se da luz do sol distante e material do cometa para crescer e produzir o oxigênio necessário, e assim poderiam ser criados habitats para a humanidade no sistema solar exterior.

Dyson publicou suas especulações e observações sobre a tecnologia e o futuro: Mundos imaginados, De Eros a Gaia, Perturbando o Universo.

Notabilizou-se também em seus estudos sobre a origem da vida, ao propor origens independentes para o metabolismo e para a reprodução.

Desde 2003 Dyson é presidente do Space Studies Institute, organização fundada por Gerard Kitchen O'Neill.

Casado com Verena Huber-Dyson, é pai de Esther Dyson e do historiador da tecnologia George Dyson.

Foi laureado com a Medalha Max Planck em 1969 e em 2000 com o Prêmio Templeton. Ele também foi um dos que assinaram uma petição para o presidente Barack Obama em 2015 para que o Governo Federal dos Estados Unidos fizesse um pacto de desarmamento nuclear e de não-agressão. Wikipedia  

✵ 15. Dezembro 1923   •   Outros nomes Freeman John Dyson
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Freeman Dyson: 90   citações 0   Curtidas

Freeman Dyson: Frases em inglês

“Rutherford did not pretend to understand quantum mechanics, but he understood that the Gamow formula would give his accelerator a crucial advantage. Even particles accelerated at much lower energies … would be able to penetrate into nuclei. Rutherford invited Gamow to Cambridge in January 1929 … [They] became firm friends and Gamow's insight gave Rutherford the impetus to go full steam ahead with the building of his accelerator.”

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Freeman Dyson

The Scientist As Rebel (2006)

“Starting from Einstein's theory of general relativity, Oppenheimer and Snyder found solutions… that described what happens to a massive star when it has exhausted its supplies of nuclear energy. The star collapses gravitationally and disappears from the visible universe, leaving behind only an intense gravitational field to mark its presence. The star remains in a state of permanent free fall, collapsing endlessly inward into the gravitational pit without ever reaching the bottom. … In my opinion, the black hole is incomparably the most exciting and the most important consequence of general relativity. But Einstein … was actively hostile to the idea of black holes. … Oddly enough, Oppenheimer too in later life was uninterested in black holes, although… they were his most important contribution to science. … Oppenheimer in his later years believed that the only problem worthy of attention of a serious theoretical physicist was the discovery of fundamental equations of physics. Einstein certainly felt the same way.”

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Freeman Dyson

The Scientist As Rebel (2006)

“The gospel of St. Matthew told of the angry Jesus driving the merchants and money-changers out of the temple, knocking over the tables of the money-changers and spilling their coins on the floor. Jesus was not opposed to capitalism and the profit motive, so long as economic activities were carried on outside the temple. In the parable of the talents, he praises the servant who used his master's money to make a profitable investment, and condemns the servant who was too timid to invest. But he draws a clear line at the temple door. Inside the temple, the ground belongs to God and profit-making must stop.”

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Freeman Dyson

Progress In Religion (2000)

“The two great conceptual revolutions of twentieth-century science, the overturning of classical physics by Werner Heisenberg and the overturning of the foundations of mathematics by Kurt Gödel, occurred within six years of each other within the narrow boundaries of German-speaking Europe. … A study of the historical background of German intellectual life in the 1920s reveals strong links between them. Physicists and mathematicians were exposed simultaneously to external influences that pushed them along parallel paths. … Two people who came early and strongly under the influence of Spengler's philosophy were the mathematician Hermann Weyl and the physicist Erwin Schrödinger. … Weyl and Schrödinger agreed with Spengler that the coming revolution would sweep away the principle of physical causality. The erstwhile revolutionaries David Hilbert and Albert Einstein found themselves in the unaccustomed role of defenders of the status quo, Hilbert defending the primacy of formal logic in the foundations of mathematics, Einstein defending the primacy of causality in physics. In the short run, Hilbert and Einstein were defeated and the Spenglerian ideology of revolution triumphed, both in physics and in mathematics. Heisenberg discovered the true limits of causality in atomic processes, and Gödel discovered the limits of formal deduction and proof in mathematics. And, as often happens in the history of intellectual revolutions, the achievement of revolutionary goals destroyed the revolutionary ideology that gave them birth. The visions of Spengler, having served their purpose, rapidly became irrelevant.”

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Freeman Dyson

The Scientist As Rebel (2006)

“After sketching his program for the scientific revolution that he foresaw, Bacon ends his account with a prayer: "Humbly we pray that this mind may be steadfast in us, and that through these our hands, and the hands of others to whom thou shalt give the same spirit, thou wilt vouchsafe to endow the human family with new mercies". That is still a good prayer for all of us as we begin the twenty-first century.”

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Freeman Dyson

Progress In Religion (2000)

“Science as subversion has a long history. … Davis and Sakharov belong to an old tradition in science that goes all the way back to the rebels Benjamin Franklin and Joseph Priestley in the eighteenth century, to Galileo and Giordano Bruno in the seventeenth and sixteenth. If science ceases to be a rebellion against authority, then it does not deserve the talents of our brightest children. … We should try to introduce our children to science today as a rebellion against poverty and ugliness and militarism and economic injustice.”

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Freeman Dyson

The Scientist As Rebel (2006)

“It is probably not an accident that modern science grew explosively in Christian Europe and left the rest of the world behind. A thousand years of theological disputes nurtured the habit of analytical thinking that could also be applied to the analysis of natural phenomena. On the other hand, the close historical relations between theology and science have caused conflicts between science and Christianity that does not exist between science and other religions.”

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Freeman Dyson

The Scientist As Rebel (2006)

“All the books that I have seen about the science and the economics of global warming, including the two books under review, miss the main point. The main point is religious rather than scientific. There is a worldwide secular religion which we may call environmentalism, holding that we are stewards of the earth, that despoiling the planet with waste products of our luxurious living is a sin, and that the path of righteousness is to live as frugally as possible. … Environmentalism has replaced socialism as the leading secular religion.”

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Freeman Dyson

The New York Review of Books (12 June 2008)

“I do not claim any ability to read God's mind. I am sure of only one thing. When we look at the glory of stars and galaxies in the sky and the glory of forests and flowers in the living world around us, it is evident that God loves diversity. Perhaps the universe is constructed according to a principle of maximum diversity.”

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Freeman Dyson

Progress In Religion (2000)

“Scientists and business leaders who care about social justice should join forces with environmental and religious organizations to give political clout to ethics. Science and religion should work together to abolish the gross inequalities that prevail in the modern world. That is my vision, and it is the same vision that inspired Francis Bacon four hundred years ago, when he prayed that through science God would "endow the human family with new mercies."”

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Freeman Dyson

Progress In Religion (2000)

“Astronomers have so far escaped the extreme specialization that has overtaken physicists. Telescopes are big, but they are not as complicated as accelerators. Observations with a big telescope can be carried out in hours rather than years.”

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Freeman Dyson

The Scientist As Rebel (2006)

“The bottom line for mathematicians is that the architecture has to be right. In all the mathematics that I did, the essential point was to find the right architecture. It's like building a bridge. Once the main lines of the structure are right, then the details miraculously fit. The problem is the overall design.”

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Freeman Dyson

"Freeman Dyson: Mathematician, Physicist, and Writer". Interview with Donald J. Albers, The College Mathematics Journal, vol 25, no. 1, (January 1994)

“The laws of nature are constructed in such a way as to make the universe as interesting as possible.”

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Freeman Dyson

Imagined Worlds (1997)

“It is a curious paradox that several of the greatest and most creative spirits in science, after achieving important discoveries by following their unfettered imaginations, were in their later years obsessed with reductionist philosophy and as a result became sterile. Hilbert was a prime example of this paradox. Einstein was another.”

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Freeman Dyson

The Scientist As Rebel (2006)

“Nobody knows what dark matter is. It is another deep mystery waiting to be explored. We know only that it is there, and that it weighs more than the stuff that we can see.”

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Freeman Dyson

The Scientist As Rebel (2006)

“Gödel's theorem shows conclusively that in pure mathematics reductionism does not work. To decide whether a mathematical statement is true, it is not sufficient to reduce the statement to marks on paper and to study the behavior of the marks. Except in trivial cases, you can decide the truth of a statement only by studying its meaning and its context in the larger world of mathematical ideas.”

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Freeman Dyson

The Scientist As Rebel (2006)

“I had the good luck a few years ago to visit the archeological site of Zippori in Israel … I could see here displayed the Greek culture that Jesus decisively rejected, the same Greek culture that infiltrated the Christian religion soon after his death and has dominated Christianity ever since.”

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Freeman Dyson

The Scientist As Rebel (2006)

“Anyone who compares the bibliography with the reprinted papers will notice that mathematics and physics have not been given equal treatment. There is a strong bias in favor of mathematics. The bias arises from the fact that mathematical papers, provided that are correct and not trivial, have permanent value, whereas most papers in physics journals are ephemeral. For this reason, it is customary to publish complete collected works of mathematicians but only selected works of physicists.”

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Freeman Dyson

Selected Papers of Freeman Dyson with Commentary. https://books.google.com/books?id=nnyNUidX1OMC&pg=PA1 American Mathematical Soc. (1996) p. 1

“Sharing the food is to me more important than arguing about beliefs. Jesus, according to the gospels, thought so too.”

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Freeman Dyson

Progress In Religion (2000)

“As we look out into the Universe and identify the many accidents of physics and astronomy that have worked together to our benefit, it almost seems as if the Universe must in some sense have known that we were coming.”

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Freeman Dyson

As quoted in The Anthropic Cosmological Principle (1986) by John D. Barrow and Frank J. Tipler, p. 318

“Unfortunately a large number of people in many countries are strongly opposed to green technology, for reasons having little to do with the real dangers. It is important to treat the opponents with respect, to pay attention to their fears, to go gently into the new world of green technology so that neither human dignity nor religious conviction is violated. If we can go gently, we have a good chance of achieving within a hundred years the goals of ecological sustainability and social justice that green technology brings within our reach.”

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Freeman Dyson

Progress In Religion (2000)

“The great question for our time is, how to make sure that the continuing scientific revolution brings benefits to everybody rather than widening the gap between rich and poor. To lift up poor countries, and poor people in rich countries, from poverty, to give them a chance of a decent life, technology is not enough. Technology must be guided and driven by ethics if it is to do more than provide new toys for the rich.”

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Freeman Dyson

Progress In Religion (2000)

“An awareness of our smallness may help to redeem us from the arrogance which is the besetting sin of the scientists.”

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Freeman Dyson livro Infinite in All Directions

Fonte: Infinite in All Directions (1988), Ch. 1 : In Praise of Diversity

“It has been generally believed that only the complex numbers could legitimately be used as the ground field in discussing quantum-mechanical operators. Over the complex field, Frobenius' theorem is of course not valid; the only division algebra over the complex field is formed by the complex numbers themselves. However, Frobenius' theorem is relevant precisely because the appropriate ground field for much of quantum mechanics is real rather than complex.”

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Freeman Dyson

[The threefold way: algebraic structure of symmetry groups and ensembles in quantum mechanics, Jour. Math. Phys., 3, 1962, 1199–1215, https://books.google.com/books?id=nnyNUidX1OMC&pg=PA410] (p. 1200)

“It is more difficult for a modern scientist to be a serious Christian, like Polkinghorne, than to be a serious Muslim, like the Nobel Prize-winning physicisit Abdus Salam. Salam happily proclaimed his Muslim faith but did not feel any need to write books about it. For Salam, the idea of a conflict between his faith and his science was ludicrous. Muslim faith has nothing to do with science. But Polkinghorne writes books to prove to himself and to us that his theology and his science can live together harmoniously..”

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Freeman Dyson

The Scientist As Rebel (2006)

“The common root of modern science and Christian theology was Greek philosophy. The historical accident that caused the Christian religion to become heavily theological was the fact that Jesus was born in the Eastern part of the Roman Empire at the time when the prevailing culture was profoundly Greek.”

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Freeman Dyson

The Scientist As Rebel (2006)

“In the little town of Princeton where I live, we have more than twenty churches and at least one synagogue, providing different forms of worship and belief for different kinds of people. They do more than any other organizations in the town to hold the community together. Within this community of people, held together by religious traditions of human brotherhood and sharing of burdens, a smaller community of professional scientists also flourishes.”

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Freeman Dyson

Progress In Religion (2000)

“I am neither a saint nor a theologian. To me, good works are more important than theology. We all know that religion has been historically, and still is today, a cause of great evil as well as great good in human affairs. We have seen terrible wars and terrible persecutions conducted in the name of religion. We have also seen large numbers of people inspired by religion to lives of heroic virtue, bringing education and medical care to the poor, helping to abolish slavery and spread peace among nations. Religion amplifies the good and evil tendencies of individual souls. Religion will always remain a powerful force in the history of our species. To me, the meaning of progress in religion is simply this, that as we move from the past to the future the good works inspired by religion should more and more prevail over the evil.”

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Freeman Dyson

Progress In Religion (2000)

“... the most important questions and insights and goals are unpredictable.”

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Freeman Dyson

email sent to David Brown, 1 January 2020, quoted in [Freeman Dyson - Science and Religion (151/157) (comments section), 27 July 2016, YouTube, https://www.youtube.com/watch?v=xwoVrSICaTA] (published by Web of Stories - Life Stories of Remarkable People)

“God is what mind becomes when it has passed beyond the scale of our comprehension.”

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Freeman Dyson livro Infinite in All Directions

Fonte: Infinite in All Directions (1988), Ch. 6 : How Will it All End?