All Questions
Tagged with standard-model condensed-matter
10
questions
2
votes
1
answer
85
views
Could there be states of matter that could avoid "matter decay"?
Regular structures of matter may decay over extremely long periods of time (especially if proton decay occurs, which is not proven but it remains a possibility)
Even if that happens, are there any ...
- 2,472
2
votes
2
answers
81
views
Can exchange interaction exist between electron and muon? [closed]
I'm studying about the exchange interaction and it's quite confusing.
Why does it happens between same kinds of particle?
How about electron and muon? Or one particle and another one which has all the ...
- 57
0
votes
1
answer
321
views
Helicity operator $h=\hat p \cdot S$ related to the chirality of massless fermions also in other dimensions? (other than 4d)
Is the helicity operator $h=\hat p \cdot S$ such as the one defined in eq (3.54) of Peskin QFT book well-defined in other dimensions? For example, there Peskin focused on 3d space and 1d time (4d). ...
- 4,336
2
votes
1
answer
91
views
Does Lorentz symmetry breaking always require "stuff"?
Following the thread "can Lorentz symmetry be broken?" and the paper "Zoology of condensed matter:
Framids, ordinary stuff, extra-ordinary stuff", it appears that any system with ...
- 2,625
2
votes
2
answers
512
views
Term in Lagrangian Invariant under $SO(n)$ but not $O(n)$?
In condensed matter physics or quantum field theory we often write down terms in our Lagrangian which are invariant under given symmetries. The standard model for example is invariant under $SU(3)\...
1
vote
0
answers
83
views
Infinite-fermion condensed $\langle \psi^n \rangle$ superconductor as $U(1)_f$ QED
I find it puzzling to consider the relation between (1) and (2).
(1) The superconductor obtained from an infinite number of fermion condensation $\langle \psi^n \rangle$ with a $n \to \infty$ with a ...
- 7,848
3
votes
1
answer
142
views
Are Type -II Dirac Fermions "true" particles that are not accounted for in the Standard Model?
The article " Type -II Dirac Fermions" in Physics 10, 74, July 5, 2017 suggests these particles have been "spotted" and are a low-energy condensed-matter particle that "break Lorentz invariance ...
user86411
5
votes
2
answers
2k
views
Why is the Higgs VEV called vacuum Higgs condensate?
In this Lubos says that Higgs VEV is also called vacuum Higgs condensate which the term used by Prof. Englert in this video. Since the Higgs field is bosonic, I wonder whether this terminology has ...
- 26.8k
4
votes
0
answers
136
views
Few questions regarding String-Net theory and the Standard Model
A friend today showed me this post and after reading Prof. Wen's answer, few questions came to my mind. Prof. Wen says:
all fermions (elementary or composite) must carry gauge charges (see cond-...
- 1,408
4
votes
1
answer
579
views
Chiral Fermion Problem and the String Net Model
In Xiao-Gang Wen's book "Quantum Field Theory of Many-Body Systems", he mentions that
(the string-net condensation picture)...has a problem: we do not yet know how to produce the $SU(2)$ part of ...
- 2,665