Nonlinear fractional wave equation on compact Lie groups

Let $G$ be a compact Lie group. In this article, we consider the initial value fractional wave equation with power-type nonlinearity on $G$. Mainly, we investigate some $L^{2}-L^{2}$ estimates of the solutions to the homogeneous fractional wave equation on $G$ with the help of the group Fourier transform on $G$. Further, using the Fourier analysis on compact Lie groups, we prove a local in-time existence result in the energy space. Moreover, under certain conditions on the initial data, a finite time blow-up result is established. We also derive a sharp lifespan for local (in-time) solutions. Finally, we consider the space-fractional wave equation with a regular mass term depending on the position and study the well-posedness of the fractional Klein-Gordon equation on compact Lie groups.

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