HOMFLY-PT polynomial and normal rulings of Legendrian solid torus links

Details HOMFLY-PT polynomial and normal rulings of Legendrian solid torus links HOMFLY-PT polynomial and normal rulings of Legendrian solid torus links

2010-06-16

arxiv.org/abs/1006.3285v1

Mathematics

Geometric Topology

30 pages, 9 figures

Scientific paper

We show that for any Legendrian link $L$ in the $1$-jet space of $S^1$ the $2$-graded ruling polynomial, $R^2_L(z)$, is determined by the Thurston-Bennequin number and the HOMFLY-PT polynomial. Specifically, we recover $R^2_L(z)$ as a coefficient of a particular specialization of the HOMFLY-PT polynomial. Furthermore, we show that this specialization may be interpreted as the standard inner product on the algebra of symmetric functions that is often identified with a certain subalgebra of the HOMFLY-PT skein module of the solid torus. In contrast to the $2$-graded case, we are able to use $0$-graded ruling polynomials to distinguish many homotopically non-trivial Legendrian links with identical classical invariants.

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