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Counting conjugacy classes in groups with contracting elements. (arXiv:1810.02969v1 [math.GR])
来源于:arXiv
In this paper, we derive an asymptotic formula for the number of conjugacy
classes of elements in a class of statistically convex-cocompact actions with
contracting elements. Denote by $\mathcal C(n)$ (resp. $\mathcal C'(n)$) the
set of (resp. primitive) conjugacy classes of stable length at most $n$. The
main result is an asymptotic formula as follows: $$\sharp \mathcal C(n) \asymp
\sharp \mathcal C'(n) \asymp \frac{\exp(\e G)}{n}.$$ The same formula holds for
conjugacy classes using pointed length for any given basepoint. As a
consequence of the formulae, the conjugacy growth series is transcendental for
all non-elementary relatively hyperbolic groups, graphical small cancellation
groups with finite components. As by-product of the proof, we establish several
useful properties for an exponentially generic set of elements. In particular,
it yields a positive answer to a question of Maher that an exponentially
generic elements in mapping class groups have their Teichm\"{u}ller axis
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