Walsh's Conformal Map onto Lemniscatic Domains for Several Intervals

We consider Walsh's conformal map from the complement of a compact set $E = \cup_{j=1}^\ell E_j$ with $\ell$ components onto a lemniscatic domain $\widehat{\mathbb{C}} \setminus L$, where $L$ has the form $L = \{ w \in \mathbb{C} : \prod_{j=1}^\ell \lvert w - a_j \rvert^{m_j} \leq \operatorname{cap}(E) \}$. We prove that the exponents $m_j$ appearing in $L$ satisfy $m_j = \mu_E(E_j)$, where $\mu_E$ is the equilibrium measure of $E$. When $E$ is the union of $\ell$ real intervals, we derive a fast algorithm for computing the centers $a_1, \ldots, a_\ell$. For $\ell = 2$, the formulas for $m_1, m_2$ and $a_1, a_2$ are explicit. Moreover, we obtain the conformal map numerically. Our approach relies on the real and complex Green's functions of $\widehat{\mathbb{C}} \setminus E$ and $\widehat{\mathbb{C}} \setminus L$.