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Wickey Dcrouze: on 7/25/18 at 6:24am UTC, wrote So nice post it is. Techsmith promo codes is giving you a big discount on...

Georgina Woodward: on 6/24/18 at 0:32am UTC, wrote John, you are changing two aspects of the experiment in addition to...

Georgina Woodward: on 6/19/18 at 0:03am UTC, wrote Hi John, I don't think that there is actual superposition happening in...

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John Taylor: on 5/25/18 at 23:03pm UTC, wrote Tell me what you think of this thought experiment: How significant are...

Georgina Woodward: on 4/15/18 at 1:48am UTC, wrote Physics of the Observer – Cosmology: Panel discussion with Prof. Sean...

Georgina Woodward: on 4/14/18 at 3:10am UTC, wrote The second half of the video is about observer's. Including the question of...



FQXi FORUM
September 19, 2018

CATEGORY: Ultimate Reality [back]
TOPIC: Physics of the Observer Series [refresh]
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Member Farzad Nekoogar wrote on Feb. 28, 2018 @ 06:25 GMT
Please visit MVJS physics of the observer series:

Physics of the Observer – Cosmology (Panel Discussion):



Reliable observers in the multiverse:



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Member Farzad Nekoogar wrote on Apr. 13, 2018 @ 00:31 GMT
Physics of the Observer – Cosmology:

https://www.youtube.com/watch?v=Fs8uHXnm-o8

The Role of the Observer - Prof. Yasunori Nomura:

https://www.youtube.com/watch?v=s808RFYoojQ

What Exists and What Happens: The Role of the Observer - Prof. Raphael Bousso:

https://www.youtube.com/watch?v=vMyGODNuWiI

Reliable observers in the multiverse – Prof. Sean Carroll

https://www.youtube.com/watch?v=ckrtCT3wPA0

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Georgina Woodward wrote on Apr. 13, 2018 @ 03:35 GMT
Re. "What Exists and What Happens: The Role of the Observer - Prof. Raphael Bousso:" Nice clear presentation, cute spider.

The Schrodinger's cat experiment is a red herring. A decayed and non decayed a particle are different from each other because the decayed particle has lost something and is therefore not an identical system to the un-decayed. It might be regarded as a different object because that change has happened. A shattered flask of poison is not the same as an intact flask of poison. The shards of glass are different objects from the intact flask object. It is not a matter of relative perspective. Likewise dead and alive cat. The live cat has functioning metabolism, the dead does not. Which is not a matter of relative perspective but intrinsic difference in state of being.Therefore the Schördinger's cat thought experiment does not provide an analogy of what is going on in quantum experiments because decayed and un-decayed can not coexist and nor can broken and unbroken, or dead and alive.

There needs to be two different notions of what happens, One is unseen change happening to an actualized system, the other is what is seen to have happened which is a construction utilizing information that has been received. It seems to me that overcomes a lot of puzzlement.

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Georgina Woodward wrote on Apr. 13, 2018 @ 04:14 GMT
The Role of the Observer - Prof. Yasunori Nomura: Interesting discussion of two different kinds of "observer".

Re, the reference frame. What is seen to be in a reference frame has to be the product of information processing, from EM signal receipt. Without that process there isn't any visual knowledge. The reference frame is a construct not externally existing, but representing sources of the information obtained. The observer deemed to be moving obtains different information from the one deemed to be stationary and so the content of the constructed reference frames shows that.

The second part of the talk about quantum observers seems to be approaching a similar idea. The superposition representing possibilities but each observer constructing the outcome from the information uniquely received. Agreeing with the speaker; The multiverse representing possibilities (an observer might construct) prior to choice rather than physically real outcomes belonging to different universes.

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Georgina Woodward replied on Apr. 14, 2018 @ 00:04 GMT
Another multiverse can be considered as many unique individual constructs from the information uniquely obtained if there are multiple observers of the system under investigation. However in an experiment where interaction with the apparatus and or protocol causes the outcome, the result will be the same for all subsequent observers of the result. E.g. a spin up result will be spin up for all recipients of the information about the result.There is a similarity here with the Andromeda paradox. A distant material event that has occurred will be seen to have occurred when observers receive the signals transmitted from it. Between happening and awareness of it there is fate. What has already happened distantly can not be made to not have happened. A singular quantum measurement result is different from macroscopic observations involving many photons. For the macroscopic system different observers can receive different signal photons from which different constructs can be made. Consider an array of cameras surrounding a butterfly.

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Georgina Woodward wrote on Apr. 14, 2018 @ 01:57 GMT
Re. Reliable observers in the multiverse – Prof. Sean Carroll. The talk begins considering Newtonian time as the time of the universe. It is sequential fitting our experience. There is discussion of why past and future seem different to us.

Newtonian time is not just sequential but also eternal time , the dwelling place of Newton's God, stretching from eternity to eternity, being always and everywhere. Such a consideration was necessary for Newton to fit with his faith but is it also necessary for modern physics? I'd say no, what matters is the sequential nature not stretching from eternity to eternity. If each actualized configuration of the universe is a time, and change of that configuration superseding the former is foundational passage of time, there is a clear and unambiguous difference between past existence and the future that has not and does not exist (an open future). With this kind of time the arrow of time does not need accounting for by entropy. There can be parts of the universe with increasing entropy and parts with decreasing entropy; Development and decomposition. Avoiding the theoretical, eventual cold, dark heat death of the universe that is inevitable with the entropy/ thermodynamic arrow of time.

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Georgina Woodward replied on Apr. 14, 2018 @ 03:10 GMT
The second half of the video is about observer's. Including the question of whether they can randomly fluctuate into existence. Sean Carroll says that quantum physics says that "if you are not looking at a system it "looks like" a wave. When you look at it it "looks like" a particle. He then relates that to space. To paraphrase, not looked at; just a wave configuration of the vacuum, "nothing...

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Georgina Woodward wrote on Apr. 15, 2018 @ 01:48 GMT
Physics of the Observer – Cosmology: Panel discussion with Prof. Sean Carroll, Prof. Yasunori Nomura and Prof. Raphael Bousso.

Lots of interesting discussion. About half way through Sean Carroll asks for someone to stand up for "real objective reality". The participants are reluctant. I'd like to do that by arguing that a singular term "the universe" is inadequate as a term for all that...

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John Joseph Taylor wrote on May. 25, 2018 @ 23:03 GMT
Tell me what you think of this thought experiment:

How significant are our decisions? Are they meaningless, as in they are determined, and we are just objects set in motion with no control of our destiny. Or are the decisions we make ours and we are therefore in control of our own destiny? One such area in physics which might set light on this is quantum mechanics, and in particular the...

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Georgina Woodward replied on Jun. 19, 2018 @ 00:03 GMT
Hi John,

I don't think that there is actual superposition happening in double slit experiments, i.e. the particle used taking both paths until a result is obtained. Rather I think that the moving thing is accompanied by an undetectable disturbance which is able to pass through both slits, and cause a wave interference that then affects the path taken by the particle. Leading to an interference pattern if many individual particles are used.

1. An average bacterium is considerably larger than a particle, even a C60 Buckyball. Estimate: 50um to 750um :.1um(micrometer) is a millionth of a meter. Compared to a Buckyball C60 of 1.1nm 1nm (nanometer) is one billionth of a meter. I think that the imperceptible wave interference (that can affect a particle would likely be too small to affect the path taken by the bacterium. Relative scale is important.

2. You also mention airborne bacteria. The double slit experiments are conducted in an airless environment. How would you prevent air movements influencing the path of the bacteria? The bacteria will require a life supporting environment

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Georgina Woodward replied on Jun. 24, 2018 @ 00:32 GMT
John,

you are changing two aspects of the experiment in addition to change of test object (bacterium rather than particle). By changing the environment from a vacuum to air ( or maybe water) you are introducing the possibility of affects on the test object from that courser addition to the environment. Such as from Brownian motion, (movement due to bombardment by molecules not true motility) and from convection currents. The other change you are making is in the propulsion of the test object. No external propulsion of the bacteria unlike the particles."Rather than being fired across the microbes will make the decision to travel towards the food on the detector screen. They will not be set in motion."John. It will be very difficult to introduce them perfectly stationary. Making three changes at once makes it hard to say that the difference found isn't just due to the different methods.

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