The general odd-prime torsion conjecture for matching complexes

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Let p=2q−1p=2q-1 be an odd prime, and let n=2k+1+3rn=2k+1+3r and d=k−1+rd=k-1+r. Then the relevant reduced homology group is H~k−1+r(M2k+1+3r;Z)\tilde{H}_{k-1+r}(\mathsf{M}_{2k+1+3r};\mathbb{Z}). The general odd-prime torsion conjecture. The group contains elements of order pp whenever r≥qr\geq q and

k≥(q−2)r−(q−12).k\geq(q-2)r-\binom{q-1}{2}.

Equivalently, H~d(Mn;Z)\tilde{H}_d(\mathsf{M}_n;\mathbb{Z}) contains elements of order pp whenever

(q−1)(n−q/2)2q−1−1≤d≤n−q−32.\frac{(q-1)(n-q/2)}{2q-1}-1\leq d\leq\frac{n-q-3}{2}.

The source describes this as having even less evidence than the preceding prime-specific conjectures; its general validity remains open.

References

Primary source

Jakob Jonsson, “More Torsion in the Homology of the Matching Complex”, arXiv:1203.5658 (2012).

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