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John D. Barrow

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

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.

„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)
Kontext: 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

„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)
Kontext: 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

„Scientific pictures are often not just about science.“

—  John D. Barrow

Introduction
Cosmic Imagery: Key Images in the History of Science (2008)
Kontext: 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.

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

—  John D. Barrow

...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.
Zdroj: The Book of Nothing (2009), chapter nought "Nothingology—Flying to Nowhere"

„Parmenides' influential arguments against the concept of empty space“

—  John D. Barrow

Zdroj: The Book of Nothing (2009), chapter one "Zero—The Whole Story"<!-- p. 40-->
Kontext: The Greek tradition was a complete contrast to that of the Far East.... the Greeks placed logic at the pinnacle of human thinking. Their sceptical attitude towards the wielding of 'non-being' as some sort of 'something' that could be subject to logical development was exemplified by Parmenides' influential arguments against the concept of empty space.... He maintained that you can only speak about what is: what is not cannot be thought of, and what cannot be thought of cannot be.... more unexpected was the further conclusion that time, motion nor change could exist either.

„The laws of Nature are based upon the existence of a pattern,“

—  John D. Barrow

The Artful Universe (1995)
Kontext: The laws of Nature are based upon the existence of a pattern, linking one state of affairs to another; and where there is pattern, there is symmetry. Yet... the symmetries that the laws enshrine are broken in... outcomes. Suppose that we balance a needle on its point and then release it. The law of gravity, which governs its subsequent motion, is perfectly democratic. It has no preference for any particular direction in the Universe: it is symmetrical in this respect. Yet, when the needle falls, it must fall in a particular direction. The directional symmetry of the underlying law is broken, therefore... By the same token, the fallen needle hides the symmetry of the law... Such 'symmetry-breaking' governs much of what we see in the Universe... It allows a Universe governed by a small number of symmetrical laws to manifest an infinite diversity of complex, asymmetrical states. This is how the Universe can be at once, simple and complicated.<!-- Ch. 2, pp. 36-37

„Medieval students… believed all forms of harmony to derive from a common source“

—  John D. Barrow

The Artful Universe (1995)
Kontext: 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

„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)
Kontext: 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

„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)
Kontext: 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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„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)
Kontext: 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

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

—  John D. Barrow

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

„In general, the shorter the possible representation… the less random… On this view we recognize science to be the search for algorithmic compressions.“

—  John D. Barrow

New Theories of Everything (2007)
Kontext: We say that the string is 'random' if there is no other representation of the string which is shorter than itself. But we will say that it is 'non-random' if there does exist such an abbreviated representation.... In general, the shorter the possible representation... the less random... On this view we recognize science to be the search for algorithmic compressions.<!--Ch. 1, p. 11

„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

Preface
The Book of Nothing (2009)
Kontext: 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.

„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)
Kontext: Location is not, as the estate agents say, everything. We must also consider our place in history.<!--ch. 2, p. 23

„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

Introduction
Cosmic Imagery: Key Images in the History of Science (2008)
Kontext: 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.

„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)
Kontext: 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

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

—  John D. Barrow

The Book of Universes: Exploring the Limits of the Cosmos (2011)
Kontext: 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

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

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