This is a somewhat unusual question.
I am looking for any physics problem
in which the number or factor exp(-4pi^2)
appears.
If you know one, I'd like to hear about it!
François
Many articles and papers say that 4% of all energy in the universe is baryonic. How many baryons does that make? I do not seem to find any wikipedia article or paper that gives an absolute number. Can anybody help?
Thank you!
François
If I look up how the mass of the electron runs with energy between low energy and the Planck energy due to renormalization, the difference is only a few percent. I never found such a calculation of the W or the Z bosons. Is the effect equally small? Or is there a difference?
Thank you very...
Yes, the only hint I got was that the mass gap is "necessary to explain why the nuclear force is strong but shortranged". (The rest of the text is not about motivation, but only about why the problem is hard.)
But why is QCD shortranged only if there is a mass gap? How do the two aspects...
Ed Witten was essential in organizing the 1 million dollar prize for clarification of the mass gap in QCD that is offered by the Clay institute.
But why is this issue so important? Wouldn't all the successes of QCD stay also if no glueballs existed?
Can somebody explain why Witten wants the...
I have tried a few products, and it seems to work out. The rest of the
file is more intriguing: the guy is going for the holy grail
of physics... It is quite a change in approach to what is seen around.
Unification in 3 d , unusual SU(2) symmetry breaking proposal, no GUT, non Susy - that is...
The question says it all. Black holes have mass, and they
have angular momentum.
- Is the angular momentum an integer or half an integer? Or neither/both?
- What happens when two black holes are exchanged?
François
Hi Franca,
the only place I have seen something similar is the last manuscript
on http://www.motionmountain.net/research
where Schiller uses the triple belt trick to model the strong
interaction. Does this help you?
François
D M Fradkin discussed the physics very clearly in the 1964 American Journal of Physics, I found out. The symmetries are the angular momentum and the Runge-Lentz tensor (for the harmonic oscillator in 3d, it is a tensor, not a vector). That makes 3+5=8 generators
The generators shift energy...
The 3-dimensional harmonic oscillator has SU(3) symmetry. This is stated in many papers. It seems to be due to the spherical symmetry of the system. (After all, the idea of a 3d harmonic oscillator is that a mass is attached to the origin with a spring, and that the mass can move in 3...
Now I am completely confused. The HERA collider had polarized electrons, and they call
longitudinally polirezed electrons those with "spin" (?) in the direction of motion, as can be seen on many Powerpoint presentations online.
On teh other hand, it makes sense to say that spin in direction of...