This paper is dedicated to the study of shape optimization problems for the first eigenvalue of the elliptic operator with drift L= - Δ + V(x) · ∇ with Dirichlet boundary conditions, where V is a bounded vector field. In the first instance, we prove the existence of a principal eigenvalue λ1(Ω , V) for a bounded quasi-open set Ω which enjoys similar properties to the case of open sets. Then, given m> 0 and τ≥ 0 , we show that the minimum of the following non-variational problem min{λ1(Ω,V):Ω⊂Dquasi-open,|Ω|≤m,‖V‖L∞≤τ}.is achieved, where the box D⊂ Rd is a bounded open set. The existence when V is fixed, as well as when V varies among all the vector fields which are the gradient of a Lipschitz function, are also proved. The second interest and main result of this paper is the regularity of the optimal shape Ω ∗ solving the minimization problem min{λ1(Ω,∇Φ):Ω⊂Dquasi-open,|Ω|≤m},where Φ is a given Lipschitz function on D. We prove that the optimal set Ω ∗ is open and that its topological boundary ∂Ω ∗ is composed of a regular part, which is locally the graph of a C1,α function, and a singular part, which is empty if d< d∗, discrete if d= d∗ and of locally finite Hd-d∗ Hausdorff measure if d> d∗, where d∗∈ { 5 , 6 , 7 } is the smallest dimension at which there exists a global solution to the one-phase free boundary problem with singularities. Moreover, if D is smooth, we prove that, for each x∈ ∂Ω ∗∩ ∂D, ∂Ω ∗ is C1 , 1 / 2 in a neighborhood of x.
Existence and regularity of optimal shapes for elliptic operators with drift
Velichkov B.
2019-01-01
Abstract
This paper is dedicated to the study of shape optimization problems for the first eigenvalue of the elliptic operator with drift L= - Δ + V(x) · ∇ with Dirichlet boundary conditions, where V is a bounded vector field. In the first instance, we prove the existence of a principal eigenvalue λ1(Ω , V) for a bounded quasi-open set Ω which enjoys similar properties to the case of open sets. Then, given m> 0 and τ≥ 0 , we show that the minimum of the following non-variational problem min{λ1(Ω,V):Ω⊂Dquasi-open,|Ω|≤m,‖V‖L∞≤τ}.is achieved, where the box D⊂ Rd is a bounded open set. The existence when V is fixed, as well as when V varies among all the vector fields which are the gradient of a Lipschitz function, are also proved. The second interest and main result of this paper is the regularity of the optimal shape Ω ∗ solving the minimization problem min{λ1(Ω,∇Φ):Ω⊂Dquasi-open,|Ω|≤m},where Φ is a given Lipschitz function on D. We prove that the optimal set Ω ∗ is open and that its topological boundary ∂Ω ∗ is composed of a regular part, which is locally the graph of a C1,α function, and a singular part, which is empty if d< d∗, discrete if d= d∗ and of locally finite Hd-d∗ Hausdorff measure if d> d∗, where d∗∈ { 5 , 6 , 7 } is the smallest dimension at which there exists a global solution to the one-phase free boundary problem with singularities. Moreover, if D is smooth, we prove that, for each x∈ ∂Ω ∗∩ ∂D, ∂Ω ∗ is C1 , 1 / 2 in a neighborhood of x.File | Dimensione | Formato | |
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