Nucleus of atom

  • Thread starter jal
  • Start date
  • #26
29
0
damgo!
I do not like to argue about faith and opinions.
Do you have some other facts to present that we can discuss.

You said only, "typically called the QCD vacuum".
Have you got an experiment that can be discussed?
jal
Sure. There's a bit of a difficulty in talking about direct experiments involving the vacuum, of course, because it's the vacuum... it's not like we can turn it on and off to see what changes! But we can calculate its expected effects from some theory and look for those. jal mentioned the Casimir effect, although I don't know that the QCD contribution has been seen there. Interactions with the QCD vacuum are what cause the "running" of the strong coupling constants -- that is, the strong interactions becomes weaker as you increase the energy of your experiment. This has been observed experimentally, and matches theoretical predictions of the effect of the vacuum.

In the limit of very high energies we get something called "asymptotic freedom", where the objects inside the proton seem to be just 'floating freely' around in it (not bound at all) if you hit them hard enough. This effect is also seen, and the small corrections to it also match predictions.

see, eg http://courses.washington.edu/phys55x/558Hwi_03_soln.htm [Broken] and http://www.nikhef.nl/pub/experiments/zeus/theses/wouter_verkerke/latex2html/node8.html
(esp http://courses.washington.edu/phys55x/558Hwi_03_soln_files/image098.jpg [Broken] and http://www.nikhef.nl/pub/experiments/zeus/theses/wouter_verkerke/latex2html/img123.gif )

-----

Those two articles you mentionned don't change our understanding of the standard model... They are all about understanding the kinds of things we're talking about, how the nuclear environment behaves and how to calculate various properties of the nucleus.
 
Last edited by a moderator:
  • #27
jal
549
0
damgo!
While I look over your links you can look over this link.
http://arxiv.org/PS_cache/hep-th/pdf/0406/0406024v1.pdf
REVIEW ARTICLE
The Casimir effect: Recent controversies and Progress
Kimball A. Milton
02 june 2004
---------------
p. 61 This promises to add another bit of understanding to our knowledge of Casimir forces, knowledge that seems to grow only incrementally based on specific calculations, since a general understanding is still not at hand.
p. 62
6. Dynamical Casimir Effects
Dynamically,
photons indeed should be produced by QED by a rapidly oscillating bubble, but to produce the requisite number (106 per flash) necessitated, if not superluminal velocities at least macroscopic collapse time scales of order 10−15 s, rather than the observed 10−11 s scale [80].
-----------
The casmir effect has been observed down to 10nm. The similarity with the "quark sea" at 0.1fm is only that... a similarity. The two are different.
------------
jal
 
  • #28
3,763
9
The dynamics of quarks which are bound inside the neucleus has nothing to do with casmir effects.
When did i ever say the opposite ?

You cannot cherry pick and reject tools just because you want the tool to be the universe.
Hey, all i asked for was a clarification of your question. When did i ever "cherry pick and reject" ANYTHING ?

For someone who was asking such elementary questions on ineer nucleon structure, you sure seem to have changed tone of voice quite rapidly. What is it that you want to achieve here ? There IS a reason why this thread consists out of nothing else but "you talking to yourself".

Bye.

marlon
 

Related Threads on Nucleus of atom

Replies
15
Views
4K
Replies
5
Views
3K
Replies
2
Views
4K
Replies
8
Views
2K
Replies
5
Views
3K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
4
Views
3K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
7
Views
2K
  • Last Post
Replies
0
Views
2K
Top