CFT Zoo

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on_model [2021/04/13 01:21]
Scott Lawrence 		on_model [2026/03/20 15:48] (current)
Ludo Fraser-Taliente added general dimemnsion
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 {{tag>3d holographic}} {{tag>3d holographic}}
  
-The special cases of the [[o2_model]] and [[o3_model]] are particularly well-studied. The [[Ising|Ising model]] is the case $N=1$, and the case $N=0$ is covered by  [[self_avoiding_walk|self-avoiding walks]].+The special cases of the [[o2_model]] and [[o3_model]] are particularly well-studied. Higher values of $N$ do come up occasionally, see for instance the [[o4_model]]. The [[Ising|Ising model]] is the case $N=1$, and the case $N=0$ is covered by  [[self_avoiding_walk|self-avoiding walks]].
  
-This also goes by the name of the "n-vector model".+This also goes by the name of the "n-vector model". Its Ginzburg-Landau description is the critical point of an O$(N)$-symmetric vector $\phi_i$ of scalar fields with a $\phi^4 =(\phi_i \phi_i)^2$ interaction. 
 + 
 +Until 2025 this was thought to be the same CFT as the non-linear $\sigma$ model (NLSM), but recent research has challenged this identification: the NLSM has a protected operator of dimension $N-1$ which cannot be seen in the WF CFT [[https://arxiv.org/abs/2505.21611 | 1]] [[https://arxiv.org/abs/2602.10194 | 2]]. 
 + 
 +There are very similar versions of this CFT with different statistics. 
 +The fermionic version is the [[https://arxiv.org/abs/1607.05316 | Gross-Neveu-Yukawa CFT]], which is the critical point of the U$(N)$-symmetric QFT of $N$ fermions and one scalar field. 
 +There is also a very similar supersymmetric CFT with $N+1$ chiral superfields: see [[https://arxiv.org/pdf/1409.1937 | section 4.3]]. 
 + 
 +===== General dimension ===== 
 + 
 +This CFT is usually thought to exist between 2 and 4 dimensions. However, if we are willing to consider complex (i.e. nonunitary) CFTs, it also [[https://arxiv.org/abs/1910.02462 | exists in $d>4$]].
  
 ===== Large-N limit ===== ===== Large-N limit =====
Last modified: 2021/04/13 01:21
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