{ "id": "2403.08146", "version": "v1", "published": "2024-03-13T00:17:48.000Z", "updated": "2024-03-13T00:17:48.000Z", "title": "Nodal solutions to Paneitz-type equations", "authors": [ "Jurgen Julio-Batalla", "Jimmy Petean" ], "categories": [ "math.AP", "math.DG" ], "abstract": "On a closed Riemannian manifold $(M^n ,g)$ with a proper isoparametric function $f$ we consider the equation $\\Delta^2 u -\\alpha \\Delta u +\\beta u = u^q$, where $\\alpha$ and $\\beta$ are positive constants satisfying that $\\alpha^2 \\geq 4 \\beta$. We let ${\\bf m}$ be the minimum of the dimensions of the focal varieties of $f$ and $q_f = \\frac{n-{\\bf m}+4}{n-{\\bf m}-4}$, $q_f = \\infty$ if $n\\leq {\\bf m}+4$. We prove the existence of infinitely many nodal solutions of the equation assuming that $1