The mod-p^r hyperbolicity amplification of Moore's conjecture

Let pp be a prime and rr a positive integer. A pp-local space XX is mod-prp^r hyperbolic when the number tnt_n of Z/pr\mathbb{Z}/p^r-summands in mnπm(X)\bigoplus_{m\leq n}\pi_m(X) grows exponentially, namely

lim infnlntnn>0.\liminf_n\frac{\ln t_n}{n}>0.

The mod-prp^r hyperbolicity conjecture. Let XX be a finite simply-connected CWCW-complex. If XX is rationally hyperbolic, then it is mod-prp^r hyperbolic for all primes pp and positive integers rr. The conjecture strengthens Moore's conjecture by requiring exponential growth of every prescribed torsion order, rather than merely torsion of arbitrarily high order. The paper's preceding results establish this behavior for certain spaces and, after excluding finitely many primes, in a broad family, but the stated universal claim remains open.

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Primary source

Ruizhi Huang and Stephen Theriault, “Exponential growth in the rational homology of free loop spaces and in torsion homotopy groups”, arXiv:2105.04426 (2022).

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