The grand-unification tag has no wiki summary.
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0answers
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status of +4/3 scalar as explanation of $t\bar t$ asymmetry
One of the early proposals for the Tevatron asymmetry on $t \bar t$ was a "fundamental diquark" with a charge (and hypercharge) +4/3, either in a triplet or a sextet colour. I am interested on the ...
4
votes
1answer
358 views
Why is E6 favored over E8 for GUT building?
What is the simplest explanation on why is E6 gauge group more favored as a group for Grand unified theory builders, while E8 is not? What about other exceptional groups? Which of them originate from ...
4
votes
2answers
223 views
Is there some sort of Pati-Salam model with mixed generations?
The evidence for an approximate "lepton as fourth colour" symmetry is so overhelming in the particle spectrum that Hanlon's razor does not seem to apply. Still, my own incompetence fails to recognise ...
3
votes
2answers
175 views
Simple PDE vs String Theory
For the sake of simplicity, I’d like to believe that there is one master non-linear partial differential equation
governing physics. In particular, consider a Klein-Gordon form:
$$
\frac{\partial^2 ...
3
votes
1answer
230 views
What's the deepest reason why QCD bound states have integer charge?
What's the deepest reason why QCD bound states have integer electric charge, i.e. equal to an integer times the electron charge?
Given that the quarks have the fractional electric charges they do, ...
3
votes
1answer
408 views
Introduction to Physical Content from Adjoint Representations
In particle Physics it's usual to write the physical content of a Theory in adjoint representations of the Gauge group. For example:
$24\rightarrow (8,1)_0\oplus (1,3)_0\oplus (1,1)_0\oplus ...
1
vote
2answers
325 views
Non-renormalizable corrections to GUT unification
While writing these answers: Hypercharge for U(1) in SU(2)xU(1) model and Is there a concise-but-thorough statement of the Standard Model? , it occured to me that the unification prediction for ...
1
vote
2answers
145 views
What is the relation between extra dimensions and unification of theories?
One of the most used methods in unification of theories is the use of higher dimensions. How does it actually work? If these dimensions are extremely small curled up, how does it affect the universe. ...
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Quantum gravity and GUT unification [closed]
Why do we concentrate on quantum gravity theories while GUT (strong and the electroweak) unification does not look even attainable. The QG theories do not seem to address this question (GUT).
