TITLE:
Existence of Solutions for the Schrödinger-Type Bopp-Podolsky System with Indefinite Potentials
AUTHORS:
Li Chen
KEYWORDS:
Schrödinger-Type Bopp-Podolsky System, Morse Theory, Critical Group, Indefinite Potential
JOURNAL NAME:
Journal of Applied Mathematics and Physics,
Vol.14 No.1,
December
31,
2025
ABSTRACT: This paper investigates the existence of nontrivial solutions for the Schrödinger-Bopp-Podolsky system with an indefinite potential function
V(
x
)
. The indefiniteness of
V
prevents the direct application of standard variational methods such as the mountain pass theorem, as the associated Schrödinger operator
−Δ+V
possesses a finite-dimensional negative space, leading to a loss of coercivity and the standard linking structure in the energy functional. By employing a reduction method to handle the coupling with the Bopp-Podolsky equation and applying Morse theory combined with critical groups at infinity, we establish the existence of at least one nontrivial solution under appropriate assumptions on the indefinite potential
V
. and the nonlinearity
g
.