A Heisenberg double addition to the logarithmic Kazhdan--Lusztig duality

Details A Heisenberg double addition to the logarithmic Kazhdan--Lusztig duality A Heisenberg double addition to the logarithmic Kazhdan--Lusztig duality

2009-05-13

arxiv.org/abs/0905.2215v3

Lett.Math.Phys.92:81-98,2010

Mathematics

Quantum Algebra

17 pages, amsart++, times, xy. V3: Very similar to the version to appear in Lett Math Phys

Scientific paper

10.1007/s11005-010-0373-9

For a Hopf algebra B, we endow the Heisenberg double H(B^*) with the structure of a module algebra over the Drinfeld double D(B). Based on this property, we propose that H(B^*) is to be the counterpart of the algebra of fields on the quantum-group side of the Kazhdan--Lusztig duality between logarithmic conformal field theories and quantum groups. As an example, we work out the case where B is the Taft Hopf algebra related to the U_qsl(2) quantum group that is Kazhdan--Lusztig-dual to (p,1) logarithmic conformal models. The corresponding pair (D(B),H(B^*)) is "truncated" to (U_qsl(2),H_qsl(2)), where H_qsl(2) is a U_qsl(2) module algebra that turns out to have the form H_qsl(2)=\oC_q[z,d]\tensor C[\lambda]/(\lambda^{2p}-1), where C_q[z,d] is the U_qsl(2)-module algebra with the relations z^p=0, d^p=0, and d z = q-q^{-1} + q^{-2} zd.

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