Fractional Boundary Value Problems and Elastic Sticky Brownian Motions, I: The half line

We extend the results obtained in \cite{Dov22} by introducing a new class of boundary value problems involving non-local dynamic boundary conditions. We focus on the problem to find a solution to a local problem on a domain $\mathrm{\Omega }$ with non-local dynamic conditions on the boundary $\mathrm{\partial }\mathrm{\Omega }$. Due to the pioneering nature of the present research, we propose here the apparently simple case of $\mathrm{\Omega }=(0,\mathrm{\infty })$ with boundary $\{0\}$ of zero Lebesgue measure. Our results turn out to be instructive for the general case of boundary with positive (finite) Borel measures. Moreover, in our view, we bring new light to dynamic boundary value problems and the probabilistic description of the associated models.