Who said approximately: The viscosity of the aether / vacuum state / zero-point-field / or whatever is ridiculous / ridiculously large / great / high ? This person had computed it using i.a. the c0 value of light speed. What else was in the formula ? / Grateful for info ! / ARANEV
Sorry, no idea. That model has been in the dustbin of history for a hundred years now. I never studied the details of it.
ThankYou Chalnoth and Chronos for responding. The "model" has indeed been in the "dustbin", but it appears, that like some other kinds of "dust" it has a tendency to creep out of the "dustbin" ! This may indeed try one's patience. However, the who said "it" seemed to have reached a finite value (for whatever conditions), and the purpose of the statement was clearly exactly to put the "rigid aether theory" to "rest". My reaction is, that finding some finite value does the opposite. I heard "it" one or three years ago and haven't had an opportunity before to delve into it. So, please, dear readers, every trace of "it" is of interest in order to lay the issue to rest (or resurrect it), and every lead will be appreciated.
What's with all the spurious quotes? It's rather annoying... But regardless, no, models generally don't creep out of the dustbin. Older models may sometimes inspire newer ones, but it isn't that common that a discredited model comes back. As in, almost never. I do not understand what you are trying to say.
ThankYou Chalnot and George Jones for responding. To Chalnot: My quotes are not aimed at You. Please disregard them, if they pain You. As for old theories sticking up their heads, this is common, even if they still don't qualify. As for what I'm trying to say, I regret that I see no way to be more clear. Please disregard it, if it pains You. To George Jones: No, I am not looking for a theoretical value of the cosmological constant. I am looking for who said "it" and how "it" was computed.
Which value? The cosmological constant? Because that has never been computed. At least, no value has been computed that comes remotely close to the observed value. The observed value came first from observations of Type IA supernovae from two separate groups, one led by Saul Perlmutter, and another led by Adam Riess, which discovered that the far-away supernovae were dimmer than expected. This result has since been confirmed by a wide variety of other observations, as well as further supernova observations. Various calculations of the cosmological constant from first principles with different underlying assumptions yield values that are anywhere from [itex]10^{30}[/itex] to [itex]10^{120}[/itex] times larger than the observed value.
To Chalnot: As I observed in my response to George Jones, I am not interested in the cosmological constant. As stated initially in this thread, I am interested in viscosity. I didn't anticipate,that my interest would be regarded as so opaque to comprehend. I'm sorry to have troubled You.
If anybody else has a lead to the person mentioned in the initial post, I would be grateful to learn about it.
If anybody else has a lead to the person mentioned in the initial post, I would be grateful to learn about it.
ARENEV, it is always useful and helpful to post a question clearly and succinctly so that others can understand it. English appears to be not your first language, so I will make some attempt to "guess" what you are asking. Aether does not exist, scientists believe. So, something that does not exist cannot have a viscosity.
“Viscous Gravitational Aether and the Cosmological Constant Problem” Authors:Xiao-Mei Kuang, Yi Ling (Submitted on 18 Jul 2009 (v1), last revised 29 Oct 2009 (this version, v2)) http://arXiv.org > gr-qc > arXiv:0907.3180 Also, this “viscous aether” was discussed right here on PF more than five years ago: http://www.physforum.com/index.php?showtopic=16150&st=15