The condensed three-braid Jones polynomial coefficient conjecture

Let β\beta be a condensed positive three-braid word, let w=w(β)w=w(\beta), and write rr for the number of syllables in β\beta. Define Vβ^(t)V_{\widehat{\beta}}^*(t) and Vβ^(t)V_{\widehat{\beta}}^{**}(t) by the displayed decomposition below. Here ϵn=(1)n\epsilon_n=(-1)^n, [P]j[P]_j denotes the coefficient of tjt^j in a polynomial PP, and an AC polynomial is one whose nonzero coefficients alternate in sign. A condensed three-braid has either no trivial syllables or one trivial syllable whose two adjacent syllables each have length at least three.

Condensed three-braid conjecture. One has

Vβ^(t)=ϵw(1+t2)+t2Vβ^(t),V_{\widehat{\beta}}^*(t)=\epsilon_w(1+t^2)+t^2V_{\widehat{\beta}}^{**}(t),

and the following properties hold: the sign of [Vβ^]j[V_{\widehat{\beta}}^{**}]_j is ϵr+1+j+w\epsilon_{r+1+j+w}, so Vβ^V_{\widehat{\beta}}^{**} is an AC polynomial; if β\beta has no trivial syllables, then

degVβ^(t)=wr1,[Vβ^]max=1;\deg V_{\widehat{\beta}}^{**}(t)=w-r-1,\qquad [V_{\widehat{\beta}}^{**}]_{\max}=1;

if β\beta has one trivial syllable, then

degVβ^(t)=wr2,[Vβ^]max=1;\deg V_{\widehat{\beta}}^{**}(t)=w-r-2,\qquad [V_{\widehat{\beta}}^{**}]_{\max}=-1;

and

[Vβ^]j0exactly whenj[w2degVβ^(t),degVβ^(t)].[V_{\widehat{\beta}}^{**}]_j\neq 0\quad\text{exactly when}\quad j\in[w-2-\deg V_{\widehat{\beta}}^{**}(t),\,\deg V_{\widehat{\beta}}^{**}(t)].

The claim gives a precise alternating-sign and support description for the residual part of the Jones polynomial of condensed positive three-braid closures. The supplied text does not establish whether this statement is proved or remains open.

Sources & referencesView supporting material

Primary source

David Emmes, “The Jones polynomial and related properties of some twisted links”, arXiv:1108.1523 (2011).

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