# Questions tagged [grand-unification]

A Grand Unified Theory is a model in particle physics in which at ultra-high energy, the 3 gauge interactions of the Standard Model (electromagnetic, weak, and strong) merge into a single one, characterized by one larger encompassing gauge symmetry and one unified coupling constant. After SSBreaking, force carriers differentiate themselves and are driven by the RG to their values and numbers in the lab. Use for gauge GUT and gravity unification.

172 questions
Filter by
Sorted by
Tagged with
1 vote
54 views

### Do GUT's really explain parity violation?

Every book on the Standard Model introduces early on the concept of left and right-handed quantum fields, defined as \begin{align} (\psi_L)_{\alpha} = \left(\frac{1-\gamma_5}{2}\right)_{\alpha \beta}\...
• 131
36 views

### Can you explain the Georgi–Jarlskog mass relation?

I am trying to understand the Georgi Mass relation in $SU(5)$ As far as I was aware the symmetry breaking occurs only with the various charge quantum numbers (colour, weak charge, electromagnetic). So ...
• 117
29 views

### What does it mean, during the Grand Unified Epoch, that matter fluctuated between lepton and baryon states?

My understanding of leptons and baryons is that leptons are an elementary particle, while baryons are a composite particle. Can someone explain to me what particles fluctuating between lepton and ...
144 views

### $SU(5)$ Gauge Field Theory, symmetry breaking

If I start with an $SU(5)$ gauge group and discover that the vacuum is preserved only by matrices of the form $G$ $$\begin{bmatrix} A & 0 \\ 0 & B \\ \end{bmatrix}$$ where ...
21 views

### Charged particles deflected by gravitational and magnetic fields

I am trying to better understand one of my previous questions, and another. Charged particle in uniform Magnetic field Does a charged particle orbiting Earth radiate? https://en.wikipedia.org/wiki/...
• 187
1 vote
83 views

### (Anti-)Fundamental Representation of $SU(5)$ GUT

In many places, it has been mentioned that the sum of electrical charges of the particles present in $\overline{5}$ of $SU(5)$ is zero since the trace of $SU(5)$ generators is zero. I do not ...
• 85
221 views

### Is there a clean mathematical way to deduce grand unification from string theory?

The question says it all. Simply stated: Can one prove grand unification from string theory? What is the argument chain of such a proof? The textbooks I read so far only appear to give hand-waving ...
• 727
110 views

### Was the Michelson & Morely experiment ever valid? [closed]

One of the key predecessors to Einstein's Relativity was another theory having to do with an "Aether" material. This substance was supposed to be the substrate that the universe is built ...
88 views

### How are representations of fermions and bosons made for different gauge groups?

I have been told to that representations(for particle physics) go like this: How many versions or charges of a particle can be changed from a group's associated gauge interaction In the standard model ...
101 views

### Is Monopolium Theoretically Stable Against Fusion Catalyzation of Al-27 Nuclei?

Monopolium is the hypothetical composite of either (1) a bound pair of monopoles, or (2) a magnetic monopole that has captured an atomic nucleus, analogous to how atomic nuclei capture electrons. My ...
• 360
78 views

• 9,778
1 vote
100 views

### How Can I Find Good Resources to Learn About the $SU(5)$ and $SO(10)$ Grand Unified Theories Without an Extensive Background in the Field?

I'm a first-year university student. My group and I have been tasked with finding out whether, given current scientific consensus, it looks like a viable Grand Unified Theory (GUT) can be found. We ...
1 vote
110 views

### Does a grand unified field theory need to include a Dark Energy field? [closed]

Nobody has unified field theories yet but could dark energy if considered as a field be useful in this endeavour?
163 views

### Error in Wikipedia on a flipped $SO(10)$ model

In the description of Wikipedia of flipped SO(10) model, it says that: In flipped $SO(10)$ models, however, the gauge group is $[SO(10)_F × U(1)_B]/Z_4$. If we suppose $[SU (5) × U(1)_χ ]/ Z_5$ ...
• 4,336
1 vote
54 views

### Disadvantages of flipped $SU(5)$ model

Question: What are the advantages and disadvantages of flipped $SU(5)$ model? We know the fermions (same form for three families), each consisting of the representations $\overline{5}_{−3}$ for the ...
• 4,336
303 views

### Does the lack of evidence for proton decay really rule out the basic grand unification theories?

Grand unification theories (GUT), such as $SU(5)$/$SO(10)$/SUSY variants, suggest proton decay. The lack of observational evidence for proton decay is supposed to rule out basic GUTs, at least for the ...
• 4,452
1 vote
449 views

### $\text{SU}(5)$ GUT Higgs sector and symmetry breaking

The Higgs sector of minimal $\text{SU}(5)$ GUT consists of scalar fields in two representations, a $\mathbf{24}$ and a $\mathbf{5}$. All the $\mathbf{5}$ non-derivative terms form the potential \$V(\...
• 343