John D. Barrow citáty

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John D. Barrow

Datum narození: 29. listopad 1952
Další jména: John Barrow

Reklama

John David Barrow je jedním z významných anglických kosmologů a teoretických fyziků a matematiků. V dnešní době působí jako profesor matematických věd na Univerzitě v Cambridge a také jako spisovatel a dramatik.

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Citáty John D. Barrow

„While we have no reason to expect that our position in the universe is special in every way, we would be equally misled were we to assume that it could not be special in any way.“

—  John D. Barrow
The Book of Universes: Exploring the Limits of the Cosmos (2011), Context: While we have no reason to expect that our position in the universe is special in every way, we would be equally misled were we to assume that it could not be special in any way.<!--ch. 2, p. 22

„Ultimate explanation no longer means only a story that encompasses everything.“

—  John D. Barrow
New Theories of Everything (2007), Context: Ultimate explanation no longer means only a story that encompasses everything.<!--Ch. 1, p. 6

Reklama

„The abstractions of Einstein's curved space and time gave rise to analogies and pictures that played a new explanatory role.“

—  John D. Barrow
Cosmic Imagery: Key Images in the History of Science (2008), Context: The abstractions of Einstein's curved space and time gave rise to analogies and pictures that played a new explanatory role. Space and time gave way to space-time, visible light was augmented by images across the rest of the electromagnetic spectrum, and we realised that we could see back towards the apparent beginnings of time.<!--part. 1, p. 8

„If a 'religion' is defined to be a system of ideas that contains unprovable statements, then Gödel taught us that mathematics is not only a religion, it is the only religion that can prove itself to be one.“

—  John D. Barrow
The Artful Universe (1995), Context: If a 'religion' is defined to be a system of ideas that contains unprovable statements, then Gödel taught us that mathematics is not only a religion, it is the only religion that can prove itself to be one.<!-- Ch. 5, p. 211

„What had stopped them both in their tracks was Gamow's suggestion that the laws of physics could describe something being created out of nothing.“

—  John D. Barrow
The Book of Universes: Exploring the Limits of the Cosmos (2011), Context: Einstein had spent the previous thirty years showing how we could understand the behaviour of whole universes with simple maths. Gamow saw that those universes must have had a past that was unimaginably different to the present. What had stopped them both in their tracks was Gamow's suggestion that the laws of physics could describe something being created out of nothing.<!--ch. 1, p. 2

„Where there is life there is a pattern, and where there is a pattern there is mathematics.“

—  John D. Barrow
The Artful Universe (1995), Context: Where there is life there is a pattern, and where there is a pattern there is mathematics. Once that germ of rationality and order exists to turn a chaos into a cosmos, then so does mathematics. There could not be a non-mathematical Universe containing living observers.<!-- Ch. 5, p. 230

„We are products of a past world where sensitivities to certain things were a matter of life or death.“

—  John D. Barrow
The Artful Universe (1995), Context: The Universe has imposed aspects of its structure upon us by the inevitability of the forces of Nature... In a world where adapters succeed, but non-adapters fail, one expects to find vestigial remnants... Many of these adaptations... give rise to a suite of curious byproducts, some of which have played a role in determining our aesthetic sense. We are products of a past world where sensitivities to certain things were a matter of life or death.<!-- Ch. 6, p.246

„There is a good deal more to Pythagorean musical theory than celestial harmony.“

—  John D. Barrow
The Artful Universe (1995), Context: Ancient belief in a cosmos composed of spheres, producing music as angels guided them through the heavens, was still fluorishing in Elizabethan times.... There is a good deal more to Pythagorean musical theory than celestial harmony. Besides the music of the celestial spheres (musica mundana), two other varieties of music were distinguished: the sound of instruments...(musica instrumentalis), and the continuous unheard music that emanated from the human body (musica humana), which arises from a resonance between the body and the soul.... In the medieval world, the status of music is revealed by its position within the Quadrivium—the fourfold curriculum—alongside arithmetic, geometry, and astronomy. Medieval students... believed all forms of harmony to derive from a common source. Before Boethius' studies in the ninth century, the idea of musical harmony was not considered independently of wider matters of celestial or ethical harmony.<!-- Ch. 5, pp. 201-202

„Aristotle believed that the world did not come into being at some time in the past; it had always existed and it would always exist, unchanged in essence for ever. He placed a high premium on symmetry“

—  John D. Barrow
The Book of Universes: Exploring the Limits of the Cosmos (2011), Context: Aristotle believed that the world did not come into being at some time in the past; it had always existed and it would always exist, unchanged in essence for ever. He placed a high premium on symmetry and believed that the sphere was the most perfect of all shapes. Hence the universe must be spherical.... An important feature of the spherical shape... was the fact that when a sphere rotates it does not cut into empty space where there is no matter and it leaves no empty space behind.... A vacuum was impossible. It could no more exist than an infinite physical quantity.... Circular motion was the most perfect and natural movement of all.<!--ch. 1, pp. 12-13

„If we used our discriminatory power to full, we could generate an undulating sea of sound that displayed continuously changing frequency rather like the undersea sonic songs of dolphins and whales.“

—  John D. Barrow
The Artful Universe (1995), Context: Our sensitivity to changes of pitch... is underused in musical sound. Western music, in particular, is based on scales that use pitch changes that are at least twenty times bigger than the smallest changes that we could perceive. If we used our discriminatory power to full, we could generate an undulating sea of sound that displayed continuously changing frequency rather like the undersea sonic songs of dolphins and whales.<!-- Ch. 5, p. 225

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„There was always something left: a vacuum energy that permeated every fibre of the Universe.“

—  John D. Barrow
The Book of Nothing (2009), Context: The quantum revolution showed us why the old picture of a vacuum as an empty box was untenable.... Gradually, this exotic new picture of quantum nothingness succumbed to experimental exploration... in the form of vacuum tubes, light bulbs and X-rays. Now the 'empty' space itself started to be probed.... There was always something left: a vacuum energy that permeated every fibre of the Universe. chapter nought "Nothingology—Flying to Nowhere"<!-- p. 10-->

„Scientific pictures are often not just about science.“

—  John D. Barrow
Cosmic Imagery: Key Images in the History of Science (2008), Context: Scientific pictures are often not just about science. They may... have an undeniable aesthetic quality. They may even have been primarily works of art that possess a scientific message. Introduction

„It is enigma enough that the world is described by mathematics; but by simple mathematics, of the sort that a few years energetic study now produces familiarity with, this is an enigma within an enigma.“

—  John D. Barrow
New Theories of Everything (2007), Context: Scanning the past millennia of human achievement reveals just how much has been achieved during the last three hundred years since Newton set in motion the effective mathematization of Nature. We found that the world is curiously adapted to a simple mathematical description. It is enigma enough that the world is described by mathematics; but by simple mathematics, of the sort that a few years energetic study now produces familiarity with, this is an enigma within an enigma.<!--Ch. 1, p. 2

„Continual miniaturisation allows resources to be conserved, efficiency to be increased, pollution to be reduced, and the remarkable flexibilities of the quantum world to be tapped.“

—  John D. Barrow
The Book of Universes: Exploring the Limits of the Cosmos (2011), Context: Continual miniaturisation allows resources to be conserved, efficiency to be increased, pollution to be reduced, and the remarkable flexibilities of the quantum world to be tapped. Very advanced civilizations elsewhere in the universe may have been force to follow the same technological path. Their nano-scale space probes, their atomic-scale machines and nano-computers, would be imperceptible to our course-grained surveys of the universe.... This may be the low-impact evolutionary path you need to follow in order to survive into the far, far future.<!--ch. 2, pp. 23-24

„This may be the low-impact evolutionary path you need to follow in order to survive into the far, far future.“

—  John D. Barrow
The Book of Universes: Exploring the Limits of the Cosmos (2011), Context: Continual miniaturisation allows resources to be conserved, efficiency to be increased, pollution to be reduced, and the remarkable flexibilities of the quantum world to be tapped. Very advanced civilizations elsewhere in the universe may have been force to follow the same technological path. Their nano-scale space probes, their atomic-scale machines and nano-computers, would be imperceptible to our course-grained surveys of the universe.... This may be the low-impact evolutionary path you need to follow in order to survive into the far, far future.<!--ch. 2, pp. 23-24

„Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Etiam egestas wisi a erat. Morbi imperdiet, mauris ac auctor dictum.“

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