The Lawrence--Krammer representation is unitary

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We show that the Lawrence--Krammer representation is unitary. We explicitly present the non-singular matrix representing the sesquilinear pairing invariant under the action. We show that reversing the orientation of a braid is equivalent to the transposition of its Lawrence--Krammer matrix followed by a certain conjugation. As corollaries it is shown that the characteristic polynomial of the Lawrence--Krammer matrix is invariant under substitution of its variables with their inverses up to multiplication by units, and is not a complete conjugacy invariant for braids.
16 pages, 53 pictures

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Geometric Topology, Representation Theory, 20F36; 57M07

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http://salesiana.dossiersoluciones.com/handle/123456789/63395

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0202214
 http://arxiv.org/abs/math/0202214

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arXiv