yoginka: (thinking)
Уже не раз писала об этом (тег verlinde). Но в этой статье википедии все более понятно объясняется:
https://en.wikipedia.org/wiki/Entropic_gravity
"The theory, based on string theory, black hole physics, and quantum information theory, describes gravity as an emergent phenomenon that springs from the quantum entanglement of small bits of spacetime information. As such, entropic gravity is said to abide by the second law of thermodynamics under which the entropy of a physical system tends to increase over time.
At its simplest, the theory holds that when gravity becomes vanishingly weak—levels usually seen only at interstellar distances—it diverges from its classically understood nature and its strength begins to decay linearly with distance from a mass."
И много интересных подробностей, исторические корни и т.д.
yoginka: (thinking)
Five big mysteries about CRISPR’s origins
http://www.nature.com/news/five-big-mysteries-about-crispr-s-origins-1.21294
Очередной раз поражает, какая изощренная обработка информации происходит на клеточном уровне.
yoginka: (thinking deeply)
https://www.quora.com/What-is-it-about-quantum-mechanics-that-gives-this-field-such-a-philosophical-quality/answer/Richard-Muller-3
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)
(https://www.quora.com/How-will-deeper-understanding-of-quantum-physics-hint-to-some-kind-of-existence-after-death/answer/Jess-H-Brewer)

"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
(http://physicsworld.com/cws/article/indepth/2017/jan/05/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"
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4594572/

И опять замешана теория Пенроуза-Хамероффа. Уже несколько раз о ней писала (пора, наверное тег заводить).
yoginka: (thinking)
What is a naked singularity?
(www.quora.com/What-is-a-naked-singularity/answer/Viktor-T-Toth-1)
В ответе на этот вопрос проскочило заодно и то, что в некпоторых черных дырах можно избежать попадания в сингулярнось:
"There are, however, more complicated solutions for black holes, among them the Kerr solution for a rotating black hole, the Reissner-Nordström solution for a black hole with electric charge, or the combination of these two in the so-called Kerr-Newman solution. These solutions are characterized by multiple event horizons and more complicated singular regions (e.g., a “ring” singularity) that may even be avoidable. "

И еще интересно, что даже горизонта может не быть, тогда и получается "голая сингулярность":
"But there are more extreme cases. For instance, if a Kerr black hole rotates fast enough, it has no event horizons at all. But it still has a singularity. This singularity is no longer “hidden” from the outside. In principle, it could be studied, that is, information about it can be obtained by an outside observer. Such a singularity is called “naked”."
yoginka: (thinking)
(https://www.quora.com/Is-The-Many-Worlds-Interpretation-of-QM-deterministic/answer/Viktor-T-Toth-1)
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)
http://phys.org/news/2016-10-quantum-physicists-everlasting-coherence.html
""The trick lies in the fact that local decoherence acts in a preferred direction, which is perpendicular to the one in which coherence is measured," Adesso explained. "Consequently, the resulting quantum states are overall degraded by such noise, but their observed coherence remains unaffected during the dynamics if the initial conditions are suitably chosen.""

Отмечается также, что это может объяснить и квантовые эффекты в биологии:
"Besides technological innovations, the results may also shed light on the quantum coherence that occurs naturally in biological systems, such as the light-harvesting systems in plants. Previous research has shown that some biological systems can maintain quantum coherence for very long times in certain noisy environments."
yoginka: (thinking)
Старая статья (2010), но я ее не видела раньше:
https://www.technologyreview.com/s/419590/quantum-entanglement-holds-dna-together-say-physicists/
Видимо, дальше спекуляций пока дело не пошло?
yoginka: (thinking)
(http://www.hpcoders.com.au/theory-of-nothing.pdf)
"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)
Пару лет назад написала немного о книге Сасскинда (http://yoginka.livejournal.com/314675.html). Но тогда поленилась отметить один мелкий момент о вероятностях, который мне сразу понравился.Read more... )
yoginka: (nutrition)
То, что здорОво для одного, вредно для другого.

Рассматривался один аспект - уровень глюкозы в крови после еды. Исследовали большую группу людей по всем правилам, получили результаты, неожиданные для современных представлений о питании (но неудивительные с точки зрения аюрведы):
http://news.meta.com/2015/11/19/cell-nutrition-is-personal-identical-foods-produce-healthy-and-unhealthy-responses-in-different-individuals/
Учитывалось также влияние микрофлоры кишечника на реакцию на пищу, а также обратное влияние пищи на микрофлору.
yoginka: (thinking)
http://www.nature.com/news/the-quantum-source-of-space-time-1.18797

Уже читала об этом и помещала здесь ссылки (ER=EPR). В данной статье понравилось, что детально описана история идеи.
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.

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