Abstract
We prove the Topological Mirror Symmetry Conjecture by Hausel-Thaddeus for
smooth moduli spaces of Higgs bundles of type $SL_n$ and
$PGL_n$. More precisely, we establish an equality of stringy
Hodge numbers for certain pairs of algebraic orbifolds generically fibred into
dual abelian varieties. Our proof utilises p-adic integration relative to the
fibres, and interprets canonical gerbes present on these moduli spaces as
characters on the Hitchin fibres using Tate duality. Furthermore we prove for
$d$ coprime to $n$, that the number of rank $n$ Higgs bundles of degree $d$
over a fixed curve defined over a finite field, is independent of $d$. This
proves a conjecture by Mozgovoy--Schiffman in the coprime case.
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