"Test of wave function collapse suggests gravity is not the answer"

[StevieTNZ]

https://phys.org/news/2020-09-function-collapse-gravity.html

An interesting article I saw yesterday. However, both Nature articles (the summary [https://www.nature.com/articles/s41567-020-1026-2] and the actual technical paper [https://www.nature.com/articles/s41567-020-1008-4]) are behind a paywall.

 

[bhobba]

I do not want to discourage experimenters trying interesting ideas. If standard QM is correct, as we have interpretations without collapse, such a discovery would be revolutionary. I am not referring to the standard postulates of QM we have all agreed on, I am referring to interpretations like Decoherent Histories that do not have the concept - or even the concept of measurement - it is emergent in that interpretation. QM is indeed a strange thing. Standard postulates you find in many textbooks, and to make discourse of this forum easy we have adopted, sometimes do not have counterparts in some interpretations.

Thanks
Bill

 

[physika]

https://phys.org/news/2020-09-function-collapse-gravity.html

An interesting article I saw yesterday. However, both Nature articles (the summary [https://www.nature.com/articles/s41567-020-1026-2] and the actual technical paper [https://www.nature.com/articles/s41567-020-1008-4]) are behind a paywall.

.https://www.sciencemag.org/news/202...radoxes-may-have-lost-its-leading-explanation

"Although Penrose praises the new work, he thinks it’s not really possible to test his version of the model. He says he was never comfortable with particle swerves, because they might cause the universe to gain or lose energy, violating a basic principle of physics. He has spent the pandemic lockdown creating a new and improved model. “It doesn’t produce a heating or radiation," he says. In that case, gravity might be causing collapse, yet hiding its tracks."

"Other factors such as interactions between germanium protons and electrons might also cloak the signal, says theoretical physicist Maaneli Derakhshani of Rutgers University, New Brunswick. All in all, he says, if gravity does cause collapse, the process has to be more complicated than Penrose originally proposed. “One could reasonably argue that … the juice isn’t worth the squeeze.”

.

 

[physika]

https://phys.org/news/2020-09-function-collapse-gravity.html

An interesting article I saw yesterday. However, both Nature articles (the summary [https://www.nature.com/articles/s41567-020-1026-2] and the actual technical paper [https://www.nature.com/articles/s41567-020-1008-4]) are behind a paywall.

A massive test.​

Nature Physics volume 17, pages14–15(2021)

10.1038/s41567-020-1026-2

"The gravitational collision model (Diósi–Penrose model) ruled out by Donadi and co-workers includes several assumptions such as a Poissonian model for the noise and does not exclude other well-known collapse models(4,5,9)"

4. Bassi, A., Lochan, K., Satin, S., Singh, T. P. & Ulbricht, H.
Rev. Mod. Phys. 85, 471–526 (2013).
5. Arndt, M. & Hornberger, K. Nat. Phys. 10, 271–277 (2014).
9. Ghirardi, G. C., Rimini, A. & Weber, T. Phys. Rev. D 34,
470–491 (1986). Nature.

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