On general type surfaces with $$q=1$$ q = 1 and $$c_2 = 3 p_g$$ c 2 = 3 p g
2019
Let S be a minimal surface of general type with irregularity $$q(S) = 1$$
. Well-known inequalities between characteristic numbers imply that $$\begin{aligned} 3 p_g(S) \le c_2(S) \le 10 p_g(S), \end{aligned}$$
where $$p_g(S)$$
is the geometric genus and $$c_2(S)$$
the topological Euler characteristic. Surfaces achieving equality for the upper bound are classified, starting with work of Debarre. We study equality in the lower bound, showing that for each $$n \ge 1$$
there exists a surface with $$q = 1$$
, $$p_g = n$$
, and $$c_2 = 3n$$
. The moduli space $$\mathcal {M}_n$$
of such surfaces is a finite set of points, and we prove that $$\#\mathcal {M}_n \rightarrow \infty $$
as $$n \rightarrow \infty $$
. Equivalently, this paper studies the number of closed complex hyperbolic 2-manifolds of first betti number 2 as a function of volume; in particular, such a manifold exists for every possible volume.
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