Hamilton321
Prince
Squire, I always love his purposely terrible acting.
What are you watching on Youtube, right now? Part VII
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AdamCrock
Polish Pirate
I've watched a lot of movies about quantum mechanics over the weekend. (by "Spark" mostly). As it turns out Niels Bohr was right and Einstein was wrong, the moon does not really exist when You are not looking at it. Scary stuff but it's true. (it is called the measurement problem). The nature of light changes too whether or not a sentient observer is watching it. Another very spooky thing I found out about quantum mechanics is the entanglement. Two particles being able to "communicate" with each other by unknown means, seemingly faster than the speed of light. There's of course also the tunneling of protons - it's basically teleportation on atomic scale. Empty space is not an empty space because on average it always has a particle in it. Small particles of matter can travel in all directions at the same time. There is so much of it - counter intuitive and straightforward "magical" effects in quantum mechanics that it makes my head spin.
Ferocitus
Deity
I'm watching ridiculously stupid comedy, while waiting for the BBC Live feed on Brexit to update. Anything else would be too jarring.
Ferocitus
Deity
Maybe Wojciech Zurek, a former countryman of yours can explain some of it for you.
Quantum Darwinism, an Idea to Explain Objective Reality, Passes First Tests
Three experiments have vetted quantum Darwinism, a theory that explains how quantum possibilities can give rise to objective, classical reality.
...
When you see an object, for example, that information is delivered to your retina by the photons scattering off it. They carry information to you in the form of a partial replica of certain aspects of the object, saying something about its position, shape and color. Lots of replicas are needed if many observers are to agree on a measured value — a hallmark of classicality. Thus, as Zurek argued in the 2000s, our ability to observe some property depends not only on whether it is selected as a pointer state, but also on how substantial a footprint it makes in the environment. The states that are best at creating replicas in the environment — the “fittest,” you might say — are the only ones
accessible to measurement. That’s why Zurek calls the idea quantum Darwinism.
https://www.quantamagazine.org/quan...bjective-reality-passes-first-tests-20190722/
The observer doesn't even need a mind, as the double-slit experiment will not function as expected if a clicker to count photons is added before the light hits either slit.
AdamCrock
Polish Pirate
Yet somehow photons "know" this device is gonna be used to measure them by sentient observer !
Ferocitus
Deity
Yet somehow photons "know" this device is gonna be used to measure them by sentient observer !
Photons: do they "know" when your eyes are closed?
I found a series of very helpful videos that I could stop and start as I tried to explain some concepts to the kids and others in my extended family.
Be warned though, some of the animations are very unusual.
(I think @Snerk subscribes to the channel, but I don't know what he thinks of them. )
https://www.youtube.com/channel/UCJ0yBou72Lz9fqeMXh9mkog
AdamCrock
Polish Pirate
The cat in there I presume is the Schrödinger's cat 
I always thought we don't need to literally observe an object or photon to collapse its wavefunction. It only needs to interact with something and produce observable effect.
Macroscopic object such as the Moon always exists regardless if someone looks at it, because we still "observe" it for example by registering its gravitation.
Macroscopic object such as the Moon always exists regardless if someone looks at it, because we still "observe" it for example by registering its gravitation.
Ferocitus
Deity
Obviously, quantum mechanics is still not fully understood or completely satisfactory as a theory.
That is why new methods and ideas are being explored in an attempt to remove some of the paradoxical features.
See, for example, the paper I cited in https://forums.civfanatics.com/thre...ght-now-part-vii.631679/page-37#post-15581115
In cosmology there are also difficulties that are arising from new measurements that are far more precise than were possible only 10 years ago.
Cosmologists Debate How Fast the Universe Is Expanding
https://www.quantamagazine.org/cosmologists-debate-how-fast-the-universe-is-expanding-20190808/
Others think that problems arise from the point of view taken in trying to understand the Universe. For example:
How to Understand the Universe When You’re Stuck Inside of It
https://www.quantamagazine.org/were...-an-idea-for-how-to-study-it-anyway-20190627/
Ferocitus
Deity
The cat in there I presume is the Schrödinger's cat
One of them. Like medical doctors, some physicists bury their mistakes.
AdamCrock
Polish Pirate
This is just an example but when I scroll the page "fishes" in Your avatar briefly turn black, but when I focus on them , they are always red. This means fish in Your avatar are both black and red at the same time until I look at them. Did I got that right ? (maybe my old monitor is faulty though
) Maybe actually we can change reality by observing it. It makes me wonder if somehow we actually "create" the universe from a probability wave fabric as our observation capabilities increase. Did those star systems and planets really existed untill we turned our telescopes and looked at them ? (assuming that there we no sentient aliens out there) This is all a bit over my head atm.
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Berzerker
Deity
Reagan's budget director David Stockman on Fox Business fending off Republican warmongers
PPQ_Purple
Purple Cube (retired)
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Am I the only one upset about how many, many content creators are transforming their content into full length adds instead? Like when you get a video that's as long as it always was but than suddenly in the middle or at the beginning or end the guy transitions into an add for what ever sponsor he has that just gets me riled up to no end. It completely ruins things for me and makes me feel subjectively like the entire video is just an excuse for the add to be there. Sort of like the excuse plot of a XXX movie. And it completely ruins my enjoyment.
AdamCrock
Polish Pirate
Yeah it's almost as if it was their whole sole inspiration for making a movie about x was a company y doing x in the first place - it is super annoying and discredits all the work authors make into researching the x topic. (because it is obviously biased for what company y is doing with topic x)
Yet somehow photons "know" this device is gonna be used to measure them by sentient observer !
I haven't looked into this much. But I suspect it isn't about "knowing" but simply about there being more possibilities opened, much like in simple probability theory. If any check is added, it leads to its own possible cases. Eg if you have a light switch it can just be on or off, 2 possibilities. But if you have a chair in the room and the ability to remove it, the possibilities are now four: light on/chair in, light on/chair out, light off/chair in, light off/chair out. I suppose this is a similar case (?).
Those all still need someone sentient to notice they are different states, but other than that it isn't required. Besides, afaik no one is arguing that alterations in states do not happen if no sentient observer can ever pick them up (cause this wouldn't mean anything; without such an observer you cannot know).
Furthermore, not all sentient observers would pick up all changes. We are talking about changes in states humans can (in whatever manner) notice.
AdamCrock
Polish Pirate
There is also a possibility that objects have more dimensions than can be observed by 3-dimensional observers.
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