<p>In this paper, we study the existence of positive solutions to a periodic problem for the mean curvature equation in Friedmann-Lemaître-Robertson-Walker spacetime. The equation features an indefinite weight function, and its nonlinear term exhibits superlinear growth near zero and super-exponential growth at infinity. The proof relies on topological degree theory. By using continuation methods, we also establish the existence of periodic solutions for the corresponding equation.</p>

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Positive Solutions to the Periodic Problem of the Mean Curvature Equation with Indefinite Weight in Friedmann-Lemaître-Robertson-Walker Spacetime

  • Man Xu,
  • Yong Ruan,
  • Yanyun Li

摘要

In this paper, we study the existence of positive solutions to a periodic problem for the mean curvature equation in Friedmann-Lemaître-Robertson-Walker spacetime. The equation features an indefinite weight function, and its nonlinear term exhibits superlinear growth near zero and super-exponential growth at infinity. The proof relies on topological degree theory. By using continuation methods, we also establish the existence of periodic solutions for the corresponding equation.