R-matrix

수학노트
http://bomber0.myid.net/ (토론)님의 2010년 8월 10일 (화) 12:23 판
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introduction
  • R-matrix has entries from Boltzman weights.
  • From quantum group point of view, R-matrix naturally appears as intertwiners of tensor product of two evaluation modules
  • from this intertwining property we need to consider  \(\bar R=p\circ R\) instead of the \(R\) matrix where \(p\) is the permutation map
  • this is what makes the module category into braided monoidal category

 

 

 

YBE

 

 

 

R-matrix and Braid groups
  • For \(R\) matrix on \(V \otimes V\), define \(\bar R=p\circ R\) where \(p\) is the permutation map.
    \(\bar R_i=1\otimes \cdots \otimes\bar R \cdots \otimes 1\), \(\bar R_i\) sitting in i and i+1 th slot.
  • Then YB reduces to
    \(\bar R_i\bar R_j =\bar R_j\bar R_i\) whenever \(|i-j| \geq 2 \)
    \(\bar R_i\bar R_{i+1}\bar R_i= \bar R_{i+1}\bar R_i \bar R_{i+1}\)
    which are the Braid group relations.
  • with an R-matrix satisfying the YBE, we obtain a representation of the Braid group, which then gives a link invariant in Knot theory

 

 

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