Determinants of pseudo-Laplacians and \(\zeta^{(\mathrm{reg})}(1)\) for spinor bundles over Riemann surfaces. (English) Zbl 07919180
Summary: Let \(P\) be a point of a compact Riemann surface \(X\). We study self-adjoint extensions of the Dolbeault Laplacians in hermitian line bundles \(L\) over \(X\) initially defined on sections with compact supports in \(X \setminus \{P\}\). We define the \(\zeta\)-regularized determinants for these operators and derive comparison formulas for them. We introduce the notion of the Robin mass of \(L\). This quantity enters the comparison formulas for determinants and is related to the regularized \(\zeta (1)\) for the Dolbeault Laplacian. For spinor bundles of even characteristic, we find an explicit expression for the Robin mass. In addition, we propose an explicit formula for the Robin mass in the scalar case. Using this formula, we describe the evolution of the regularized \(\zeta (1)\) for scalar Laplacian under the Ricci flow. As a byproduct, we find an alternative proof for the Morpurgo result that the round metric minimizes the regularized \(\zeta (1)\) for surfaces of genus zero.
MSC:
| 30F10 | Compact Riemann surfaces and uniformization |
| 32L05 | Holomorphic bundles and generalizations |
| 35J05 | Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation |
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