Rigidity of shrinking Ricci solitons with low-dimensional focal sets

@misc{horacio2026rigidity,
  title = {{Rigidity of shrinking Ricci solitons with low-dimensional focal sets}},
  author = {Matheus Andrade Ribeiro de Moura Horácio},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.02740},
  eprint = {2611.02740},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.02740},
}

TY  - UNPB
TI  - Rigidity of shrinking Ricci solitons with low-dimensional focal sets
AU  - Matheus Andrade Ribeiro de Moura Horácio
PY  - 2026
DA  - 2026/11/02
PB  - arXiv
DO  - 10.48550/arxiv.2611.02740
UR  - https://arxiv.org/abs/2611.02740
AB  - We prove that, in every dimension, the focal set of the potential function of a complete gradient shrinking Ricci soliton with constant scalar curvature is totally geodesic whenever it has dimension two or three, and that every complete five-dimensional gradient shrinking Ricci soliton with constant scalar curvature is rigid. The first result follows from a Bochner identity for the covariant derivative of the Ricci tensor at the focal set. For the second, when the scalar curvature is twice the soliton constant, we prove that total geodesy implies rigidity through an integral identity on the level hypersurfaces; the case of scalar curvature three times the soliton constant is treated by a separate argument. As further applications, we combine our methods with the rigidity theorem in the recent preprint of Li, Li, Ou, Qu, Wu and Zhou to obtain rigidity in arbitrary dimension when the scalar curvature is twice or three times the soliton constant, and under integral Weyl pinching for four-dimensional focal sets.
ER  -