Ljusternik-Schnirelmann eigenvalues for the fractional $m-$Laplacian without the $\Delta_2$ condition

In this work we analyze the eigenvalue problem associated to the fractional $m-$Laplacian, defined as $$(-\Delta_m)^s u(x):=2\text{p.v.}\int_{{\mathbb R}^n} m\left(\frac{|u(x)-u(y)|}{|x-y|^s}\right)\frac{(u(x)-u(y))}{|u(x)-u(y)|}\frac{dy}{|x-y|^{n+s}},$$ This operator serves as a model for nonlocal, nonstandard growth diffusion problems. In contrast to previous analyses, we explore the eigenvalue problem without presuming the $\Delta_2$ condition on $M$ -- the primitive function of $m$. Our results show the existence of a sequence of eigenvalues $\lambda_k\to\infty$. This research contributes to advancing our understanding of nonlocal diffusion models, specifically those characterized by the fractional $m-$Laplacian, by relaxing the constraints imposed by the $\Delta_2$ condition.