yoginka: (thinking deeply)
Сам ответ Ричарда ничего особенного не содержит. Но интересны комментарии, где спорят Mathieu Vandenberghe и John Fowler, и пример Джона с игрой в жизнь в конце их спора. ППКС, как говорится.
yoginka: (thinking deeply)

"There are a lot of mysteries left in physics. One of my favorites is dark matter. Lots of proposals have been made about what it is, but no one has found direct evidence for any of them yet.
My favorite speculation is that dark matter is composed of “Gordian knots” of the 26-dimensional strings proposed to account for all the known particles. For reasons beyond our ken, the topologies of these knots render them stable against decay into the simpler strings we see today. This means that they are immune to all the interactions through which they might decay, and so experience only gravity. I call them Quipu, after the knotted strings used by the Inca to store information."
yoginka: (thinking)
Decoding the quantum horizon
"Consisting of 17 senior researchers from the US, Canada, the UK, Japan, Israel and Argentina, plus a growing team of postdoctoral fellows, the collaboration is trying to answer an ambitious list of questions. Is space–time held together by quantum entanglement? Does quantum gravity allow information processing even more powerful than quantum computers? Is there a connection between computational complexity and the principle of least action?"
"Is space–time built from entanglement? Are black holes nature’s most powerful computers? "
"how the study of “qubits”, quantum bits of information, may hold the key to uniting quantum theory and general relativity into a unified theory of quantum gravity"
"it has become clear that quantum information theory is also a powerful new lens through which to examine the conundrums of quantum gravity. "
yoginka: (thinking)
"The natural history of consciousness, and the question of whether plants are conscious, in relation to the Hameroff-Penrose quantum-physical ‘Orch OR’ theory of universal consciousness"

И опять замешана теория Пенроуза-Хамероффа. Уже несколько раз о ней писала (пора, наверное тег заводить).


Dec. 29th, 2016 09:05 am
yoginka: (thinking deeply)
Перед новым годом естественно возникают мысли о времени и его природе. Нашла подтверждение тому, что давно казалось и мне, а именно, что его не удается определить без создания порочного круга. Когда-то попадалось у Аристотеля(??? лень искать), что время эквивалентчо движению. А здесь явно утверждается, что никому еще не удавалось избежать порочного круга в определении времени (https://en.wikipedia.org/wiki/Time#Time-like_concepts:_terminology):
"Time has long been an important subject of study in religion, philosophy, and science, but defining it in a manner applicable to all fields without circularity has consistently eluded scholars"
Лейбниц считал время интеллектуальной концепцией, наряду с пространством и числом.
Еще интересно (не знала), что у древних греков было два разных понятия, и Хронос соответствует тому, что используется в практике, науке, технике и т.п., а Kairos уже принципиально другое:
"The Greek language denotes two distinct principles, Chronos and Kairos. The former refers to numeric, or chronological, time. The latter, literally "the right or opportune moment", relates specifically to metaphysical or Divine time. In theology, Kairos is qualitative, as opposed to quantitative."
Это знала, но для полноты картины пусть будет:
"According to Kabbalists, “time” is a paradox and an illusion. Both the future and the past are recognized to be combined and simultaneously present."
"According to Martin Heidegger we do not exist inside time, we are time. "

Там есть много и другого интересного.
yoginka: (thinking)
Много раз встречала подобные взгляды. Но здесь мне понравилось, как кратко и точно они выражены здесь. Где-то читала, что и сам Бор так же считал насчет природы вероятностей (жаль, не помню, где читала об этом). Т.е. расхождение взглядов Бора и Эйнштейна не совсем в том, что принято подавать в популярной литературе, а более тонкое.

"Quantum mechanics tells you exactly, in a very deterministic way, how the wavefunction evolves. No probabilities are involved"

"The uncertainty principle, in its modern form, is not about probabilities: it is about commutation rules. "

"So why are we talking about probabilities, then? We do because in the end, we insert into the system something that does not exist: a classical thing (an instrument, an observer). By doing so, we force the quantum system to “collapse into an eigenstate”. But the wavefunction does not tell us which eigenstate the system collapses into; it can only provide probabilities. If instead, the “classical” thing was properly described quantum mechanically by its wavefunction, there would be no collapse nonsense. No probabilities would be involved"

"The moment you introduce this nonquantum abstraction, a classical thing, forcing the quantum system to pick an eigenstate, probabilities show up. "
yoginka: (thinking)
"Something is the "inside view" of Nothing."

Начала читать, и показалось, что должно быть интересно. Там мои любимые темы интегрированы в общую картину устройства мира. Ход мысли близок.
yoginka: (thinking)
По-английски: http://whatislife.stanford.edu/LoCo_files/What-is-Life.pdf
По-русски: http://yanko.lib.ru/books/natural/biology/schodinger-what_is_life.htm

Последнее время стала часто встречать в разных контекстах упоминания этой старой статьи Шредингера (1944). Видимо, пора читать ее.
yoginka: (thinking)
Давно не читала таких интересных статей. (И здесь замешан Seth Lloyd, на которого я уже много раз ссылалась). Статья не новая, но мне не попадалась раньше.

Time’s Arrow Traced to Quantum Source
New Quantum Theory Could Explain the Flow of Time

"“Finally, we can understand why a cup of coffee equilibrates in a room,” said Tony Short, a quantum physicist at Bristol. “Entanglement builds up between the state of the coffee cup and the state of the room.”"

"The idea that entanglement might explain the arrow of time first occurred to Seth Lloyd about 30 years ago, when he was a 23-year-old philosophy graduate student at Cambridge University with a Harvard physics degree. Lloyd realized that quantum uncertainty, and the way it spreads as particles become increasingly entangled, could replace human uncertainty in the old classical proofs as the true source of the arrow of time."

"Eventually, the correlations contained all the information, and the individual particles contained none. At that point, Lloyd discovered, particles arrived at a state of equilibrium, and their states stopped changing, like coffee that has cooled to room temperature."

"According to the scientists, our ability to remember the past but not the future, another historically confounding manifestation of time’s arrow, can also be understood as a buildup of correlations between interacting particles. When you read a message on a piece of paper, your brain becomes correlated with it through the photons that reach your eyes. Only from that moment on will you be capable of remembering what the message says. As Lloyd put it: “The present can be defined by the process of becoming correlated with our surroundings.”"

"The backdrop for the steady growth of entanglement throughout the universe is, of course, time itself. The physicists stress that despite great advances in understanding how changes in time occur, they have made no progress in uncovering the nature of time itself or why it seems different (both perceptually and in the equations of quantum mechanics) than the three dimensions of space. Popescu calls this “one of the greatest unknowns in physics.”

“We can discuss the fact that an hour ago, our brains were in a state that was correlated with fewer things,” he said. “But our perception that time is flowing — that is a different matter altogether. Most probably, we will need a further revolution in physics that will tell us about that.”"
yoginka: (thinking deeply)
(комментарий: http://www.quora.com/As-any-system-event-can-be-considered-as-a-wave-function-can-we-postulate-it-never-existed-before-it-gets-measured-collapsed-with-respect-to-a-given-observer/answer/Joshua-Engel/comment/7313932
, вся дискуссия: http://www.quora.com/As-any-system-event-can-be-considered-as-a-wave-function-can-we-postulate-it-never-existed-before-it-gets-measured-collapsed-with-respect-to-a-given-observer)

Heisenberg said that the wave function collapses when the result of a measurement is registered in the mind of an observer.

Einstein said that if quantum theory is true then the moon is not there when nobody is looking at it.

Von Neumann said that "consciousness, whatever it is, appears to be the only thing in physics that can ultimately cause this collapse or observation."

Max Planck: "I regard consciousness as fundamental. I regard matter as derivative from consciousness."

Freeman Dyson: "At the level of single atoms and electrons, the mind of an observer is involved in the description of events. Our consciousness forces the molecular complexes to make choices between one quantum state and another."

Eugene Winger: "It is not possible to formulate the laws of quantum mechanics in a consistent way without reference to the consciousness."

Pascual Jordon: "Observations not only disturb what is to be measured, they produce it."

Wolfgang Pauli: "We do not assume any longer the detached observer, occurring in the idealizations of this classical type of theory, but an observer who by his indeterminable effects creates a new situation, theoretically described as a new state of the observed system."

Martin Rees: "The universe could only come into existence if someone observed it. It does not matter that the observers turned up several billion years later. The universe exists because we are aware of it."
yoginka: (thinking)
Уже несколько раз писала об этом. Статей попадается много, но продвижений пока не видно, если не считать внушительного списка подписей авторитетов.

Еще интересная статья:

Понравился аргумент скептиков:
"if Alan Turing had gotten it into his head to try to solve it in 1945, his ideas might have been along the lines of “Place your punch cards in a locked box where German spies can’t read them.”"

Несколько новых, неожиданных аспектов проблемы, причем в паре из них мне показались и кое-какие надежды на возможные подходы к решению вопросов безопасности:

аналогия с бесконечной стимуляцией гипоталамуса (Problem 1: Wireheading);
аналогия с религией (Problem 2: Weird Decision Theory).
yoginka: (thinking deeply)
Paul Davies (editor), Niels Henrik Gregersen (editor) Information and the Nature of Reality: From Physics to Metaphysics 2010

Both matter and evil represented a privation of being or goodness (privatio boni) rather than positive principles in their own right.

Matter was that from which one must flee in order to experience salvation or liberation – or knowledge.
yoginka: (thinking deeply)
(Айзек Азимов когда-то сказал, что есть в мире два человека, которые превосходят его по интеллекту: Карл Саган и Марвин Минский.)

From Sagan's essay "On 'God' and 'Gods'":
Read more... )
yoginka: (thinking deeply)

Оказывается, американские индейцы тоже панентеисты. И даже те немногие, у которых был политеизм (ацтеки, инки, майя), на уровне жрецов и высших слоев общества были панентеистами.
yoginka: (thinking)
Perimeter Institute Public Lecture: Nima Arkani-Hamed

Лектор знаменит (для меня) тем, что когда-то предположил, что слабость гравитации может быть связана с наличием дополнительных измерений.

То же самое на другом сайте:


Теперь почти никто не верит в существование пространства и времени (6-ая минута)

ОТО выводится из СТО и квантовой механики (21-ая минута)

February 2017

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