RT Journal Article T1 On the regularity of null cones and geodesic spheres A1 Gutiérrez-López, Manuel A1 Olea-Andrades, Benjamín K1 Hipersuperficies K1 Geometría semi-riemanniana AB We show a property on the null cones in a Lorentzian manifold near a conjugate point, which contributes to the understanding of the behaviour of the exponential map. We also give an analogous property in the Riemannian case. PB Springer YR 2023 FD 2023 LK https://hdl.handle.net/10630/26308 UL https://hdl.handle.net/10630/26308 LA eng NO Gutiérrez, M., Olea, B. On the regularity of null cones and geodesic spheres. Anal.Math.Phys. 13, 30 (2023). https://doi.org/10.1007/s13324-023-00791-0 NO Funding for open access charge: Universidad de Málaga / CBUAFunding for open access publishing: Universidad Málaga/CBUA. This paper has been partiallysupported by the Ministerio de Ciencia e Innovación PID2020-118452GB-I00 and Junta de Andalucía FEDER research project UMA18-FEDERJA-183. DS RIUMA. Repositorio Institucional de la Universidad de Málaga RD 19 ene 2026