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Minimal surfaces and symplectic structures of moduli spaces. (English) Zbl 1323.53091

The author deals with a closed oriented surface \(S\) of genus larger than two, and with certain moduli spaces associated to \(S\). The central role is played by the deformation space of almost-Fuchsian structures \(\mathcal{A F}(S)\) (see [K. K. Uhlenbeck, Ann. Math. Stud. 103, 147–168 (1983; Zbl 0529.53007)]), since it can be viewed as an open subspace of either Taubes’ moduli space \(\mathcal{H},\) the deformation space \(\mathcal{C P}(S)\) of complex projective structures, or the character variety \(\mathcal{X}(S,\mathrm{PSL}_2(\mathbb{C}))\). The author compares the Goldman symplectic structure \(\omega_G\) on \(\mathcal{X}(S,\mathrm{PSL}_2(\mathbb{C}))\) restricted to \(\mathcal{A F}(S)\) with the symplectic structure \(\omega_{\mathcal H}\) of Taubes’ moduli space of minimal hyperbolic germs and the canonical cotangent symplectic structure \(\omega_{\text{can}}\) on the cotangent bundle to the Teichmüller space \(T^*\mathcal{T}(S)\). To this aim, the notion of renormalized volume for almost-Fuchsian manifolds is used; see [the author, Geom. Topol. 19, No. 3, 1737–1775 (2015; Zbl 1318.53097)].

MSC:

53D30 Symplectic structures of moduli spaces
53A10 Minimal surfaces in differential geometry, surfaces with prescribed mean curvature
32G15 Moduli of Riemann surfaces, Teichmüller theory (complex-analytic aspects in several variables)

References:

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