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Tensor space representations of Temperley-Lieb algebra via orthogonal projections of rank $r geq 1$ | | Andrei Bytsko
; | | Date: |
22 Mar 2015 | | Abstract: | Unitary representations of the Temperley-Lieb algebra $TL_N(Q)$ on the tensor
space $({mathbb C^n})^{otimes N}$ are considered. Two criteria are given for
determining when an orthogonal projection matrix $P$ of a rank $r$ gives rise
to such a representation. The first of them is the equality of traces of
certain matrices and the second is the unitary condition for a certain
partitioned matrix. Some estimates are obtained on the lower bound of $Q$ for a
given dimension $n$ and rank $r$. It is also shown that if $4r>n^2$, then $Q$
can take only a discrete set of values determined by the value of $n^2/r$. In
particular, the only allowed value of $Q$ for $n=r=2$ is $Q=sqrt{2}$. Finally,
properties of the Clebsch-Gordan coefficients of the quantum Hopf algebra
$U_q(su_2)$ are used in order to find all $r=1$ and $r=2$ unitary tensor space
representations of $TL_N(Q)$ such that $Q$ depends continuously on $q$ and $P$
is the projection in the tensor square of a simple $U_q(su_2)$ module on the
subspace spanned by one or two joint eigenvectors of the Casimir operator $C$
and the generator $K$ of the Cartan subalgebra. | | Source: | arXiv, 1503.6461 | | Services: | Forum | Review | PDF | Favorites | |
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