A central question in geometric analysis is the search for distinguished or “optimal” metrics on a given Riemannian manifold. This problem lies at the intersection of differential geometry, partial differential equations, and mathematical physics, and provides the unifying framework of my research.
A paradigmatic example is the Yamabe problem, which asks for the existence of constant scalar curvature metrics within a given conformal class and leads to a nonlinear elliptic equation with critical Sobolev growth. Motivated by this and related questions in conformal geometry, my research focuses on nonlinear elliptic and geometric PDEs on Riemannian manifolds involving critical and supercritical nonlinearities.
More recently, my work has expanded to include higher-order conformally invariant operators, such as the Paneitz–Branson operator and equations involving Q-curvature, as well as the study of Einstein metrics on warped and multiply warped product manifolds. I am particularly interested in variational methods, obstruction results, and rigidity phenomena, and in understanding how geometric and topological constraints influence the existence and qualitative behavior of solutions.
Dobarro, Fernando, and Rey, Carolina A. "Einstein multiply warped products and generalized Kasner manifolds with multidimensional base." arXiv preprint arXiv:2501.02078 (2025).
Alarcón, Salomón; Masnú, Simón; Montero, Pedro, and Rey, Carolina A. "Concentration Phenomena for Conformal Metrics with Constant Q-Curvature". arXiv preprint arXiv:2402.14675 (2024).
Alarcón, Salomón; Faya, Jorge, and Rey, Carolina. "Concentration on the Boundary and Sign-Changing Solutions for a Slightly Subcritical Biharmonic Problem". Journal of Differential Equations 437 (2025): 113285.(2025).
Alarcón, Salomón; Petean, Jimmy, and Rey, Carolina A. "Multiplicity results for constant Q-curvature conformal metrics". Calculus of Variations and Partial Differential Equations 63, 146 (2024).
Rey, Carolina A., and Saintier, Nicolas. "Non-local equations and optimal Sobolev inequalities on compact manifolds". The Journal of Geometric Analysis 34, 17 (2024).
Rey, Carolina A., and Ruiz, Juan M. "Multipeak solutions for the Yamabe equation." The Journal of Geometric Analysis 31.2: 1180-1222 (2021).
Rey, Carolina A. "Elliptic equations with critical exponent on a torus invariant region of S3". Communications in Contemporary Mathematics 21.02: 1750100 (2019).