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John David Barrow

Data de nascimento: 29. Novembro 1952
Outros nomes:John Barrow

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John David Barrow FRS é um cosmólogo, físico e matemático inglês. É atualmente professor pesquisador de ciências matemáticas da Universidade de Cambridge. Barrow é também um popular escritor de ciências e dramaturgo amador.

Citações John David 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

„The quantum revolution showed us why the old picture of a vacuum as an empty box was untenable.“

—  John D. Barrow
The Book of Nothing (2009), ...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"

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„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

„Gradually, over the last twenty years, the vacuum has turned out to be more unusual, more fluid, less empty, and less intangible than even Einstein could have imagined.“

—  John D. Barrow
The Book of Nothing (2009), Context: The spooky ether was persistent. It took an Einstein to remove it from the Universe.... Gradually, over the last twenty years, the vacuum has turned out to be more unusual, more fluid, less empty, and less intangible than even Einstein could have imagined. Its presence is felt on the very smallest and largest dimensions over which the forces of Nature act. Preface

„Mathematics became an experimental subject. Individuals could follow previously intractable problems by simply watching what happened when they were programmed into a personal computer.“

—  John D. Barrow
Cosmic Imagery: Key Images in the History of Science (2008), Context: Mathematics became an experimental subject. Individuals could follow previously intractable problems by simply watching what happened when they were programmed into a personal computer.... The PC revolution has made science more visual and more immediate.... by creating films of imaginary experiences of mathematical worlds.... Words are no longer enough. 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

„Location is not, as the estate agents say, everything. We must also consider our place in history.“

—  John D. Barrow
The Book of Universes: Exploring the Limits of the Cosmos (2011), Context: Location is not, as the estate agents say, everything. We must also consider our place in history.<!--ch. 2, p. 23

„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

„The living world is not a marble palace.“

—  John D. Barrow
New Theories of Everything (2007), Context: The living world is not a marble palace. It is a higgledy-piggledy outcome of natural selection and the competition between many interacting factors. The outcome is often neither elegant nor symmetrical.<!--Ch. 2, p. 18

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„Just focusing on what exists now seems a bit exclusive.“

—  John D. Barrow
The Book of Universes: Exploring the Limits of the Cosmos (2011), Context: Just focusing on what exists now seems a bit exclusive. And if we include everything that has ever existed as part of the universe, why not include the future as well? This seems to leave us with the definition that the universe is everything that has ever existed, does exist, or will ever exist.<!--ch. 1, p. 3

„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-->

„There could not be a non-mathematical Universe containing living observers.“

—  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

„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

„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

„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

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