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Let $\mathsf m$ be any conical (or smooth) metric of finite volume on theRiemann sphere $\Bbb CP^1$. On a compact Riemann surface $X$ of genus $g$consider a meromorphic funciton $f: X\to {\Bbb C}P^1$ such that all poles andcritical points of $f$ are simple and no critical value of $f$ coincides with aconical singularity of $\mathsf m$ or $\{\infty\}$. The pullback $f^*\mathsf m$of $\mathsf m$ under $f$ has conical singularities of angles $4\pi$ at thecritical points of $f$ and other conical singularities that are the preimagesof those of $\mathsf m$. We study the $\zeta$-regularized determinant$\operatorname{Det}' \Delta_F$ of the (Friedrichs extension of)Laplace-Beltrami operator on $(X,f^*\mathsf m)$ as a functional on the modulispace of pairs $(X, f)$ and obtain an explicit formula for $\operatorname{Det}'\Delta_F$.

On Determinants of Laplacians on Compact Riemann Surfaces Equipped with Pullbacks of Conical Metrics by Meromorphic Functions