Smolin's 1995 Landscape of Physical Law idea

  • #51
Arivero gave this link in another forum

I think I've made a rather interesting discovery here: It's well known that electron has two bigger brothers, the muon and the tau lepton. each of the three has its own anti particle. (The electron's anti-particle is the positron)



There are 3 generations of particles in nature. Three generations of leptons, three generations of neutrinos and three generations of quarks. The first generations form almost all of the matter in the universe. The 2nd and 3rd generation particles have limited lifetimes and seem to play a much less important role.

http://www.chip-architect.com/news/2004_07_27_The_Electron.html
 
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  • #52
There are 3 generations of particles in nature. Three generations of leptons, three generations of neutrinos and three generations of quarks. The first generations form almost all of the matter in the universe. The 2nd and 3rd generation particles have limited lifetimes and seem to play a much less important role.

Yes this is a known property of the standard model. There is also strong evidence that there are ONLY three generations, or flavors, as they are called.
 
  • #53
selfAdjoint said:
Yes this is a known property of the standard model. There is also strong evidence that there are ONLY three generations, or flavors, as they are called.
In fact De Vries' formula (that I quoted) can be see as an additional clue for having only 3 generations, because it gives a very strong relationship between second and third, namely
ln(mass of muon / mass of tau) = 2 sinh(ln(pi))

I can not see why this surfaces in this thread, but perhaps Sol2 aim was to point out the possibility of mathematical, not anthropic, constrainsts. In this sense, a more popular one is the sum of Cabbibo angle and solar neutrino mixing angle, which add to pi/4.

Yours,

Alejandro
 
  • #54
Hello Alejandro it's good to see you
I didnt see you around yesterday so I was afraid
I might have offended by my notice of your exchange with Lubos
the title was meant to be analogous to
Peter and the Wolf
Androcles and the Lion
also we have the story in English called
Goldilocks and the Three Bears and this
is perhaps even more germane to the generations of particles
than one might have expected
 
  • #55
Hi marcus. I was browsing very casually while I download some maps for my holidays (walking around spain, mostly).

Goldilocks could have offended me :-) Fortunately you choosed another title!
 
  • #56
Enjoy the Flower Children:)

arivero said:
In fact De Vries' formula (that I quoted) can be see as an additional clue for having only 3 generations, because it gives a very strong relationship between second and third, namely
ln(mass of muon / mass of tau) = 2 sinh(ln(pi))

I can not see why this surfaces in this thread, but perhaps Sol2 aim was to point out the possibility of mathematical, not anthropic, constrainsts. In this sense, a more popular one is the sum of Cabbibo angle and solar neutrino mixing angle, which add to pi/4.

Yours,

Alejandro

Yes thanks arivero. We were discussing natural numbers(marcus pointed these out in article by Smolin) and your link presented a interesting opportunity.

Why Baez quote is very important. Marcus might see this now.

G -> H -> ... -> SU(3) x SU(2) x U(1) -> SU(3) x U(1).
Here, each arrow represents a symmetry breaking phase transition where matter changes form and the groups - G, H, SU(3), etc. - represent the different types of matter, specifically the symmetries that the matter exhibits and they are associated with the different fundamental forces of nature

One has to follow the Model here?

Some might fail to realize that the continued geometrical effrts to describe this process, from then to now, has other psosibilties within the vast amount of "time" that such processes could have other things happening in the universe that live and die, and are reborn again? It is all very smooth transition from a "bubble perspective."

At the gravitataional collapse it can become very matter of fact? :smile:
 
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  • #57
sounds like a good way to spend the holiday
especially if in the mountains
I do not travel much for various reasons but if I were to
walk in Iberia I would first think of exploring the kingdom of
Alfonso the Wise
----added later----
By a strange coincidence a couple of hours after thinking of
Alfonso X, and posting this, I happened to visit Peter Woit's
blog Not Even Wrong and found a new blog which mentioned
Alfonso---the topic was the overcomplicated kludginess in
string theory's way of connecting to the Standard Model
and Zwiebach's comparing it to the Ptolemaic system with its
epicycles upon epicycles----intersecting branes in extra dimensions.

So commenting on the ugliness Zwiebach quoted Alfonso the Wise (1221-1284) who said, regarding the Ptolemaic system:

"If I had been present at the Creation I would have offered some helpful
advice as to the ordering of the universe."

a nice king with a quiet droll sense of humor.
strange he came up in two web-postings almost at once
 
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