The braid-index–bridge-index conjecture for L-space knots

Let KK be an L-space knot, meaning a knot admitting a Dehn surgery yielding an L-space. Let b(K)b(K) denote its bridge index and β(K)\beta(K) its braid index. The L-space knot index conjecture. If KK is an L-space knot, then its braid index and bridge index agree, that is, β(K)=b(K)\beta(K)=b(K). The conjecture holds for several important families, including two-bridge knots, Montesinos knots, 1-bridge braids, and the Baker–Kegel family, but a classification of L-space knots remains elusive and the general claim is open.

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Primary source

Siddhi Krishna and Hugh Morton, “Twist positivity, L-space knots, and concordance”, arXiv:2211.17109 (2025).

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