José Javier Ortega Gómez

Institute for Theoretical Physics (IFT UAM-CSIC)

C/ Nicolás Cabrera 13-15, Campus de Cantoblanco UAM, 28049 Madrid, Spain

I am a PhD student in theoretical physics at the Institute for Theoretical Physics (IFT UAM-CSIC), where I work in Yashar Akrami’s group, supported by an FPU (Formación de Profesorado Universitario) grant from Spain’s Ministry of Universities.

My current research focuses on cosmic topology: how Casimir energy and its backreaction leave observable imprints — isotropy violations, features in the primordial power spectrum — that could, in principle, reveal that the universe has a non-trivial shape on large scales. Earlier in my career I also worked on axial oscillations of viscous neutron stars using relativistic hydrodynamics, which led to a published paper, though it is not a line of research I am continuing.

Check out the publications page for my published and ongoing work.

news

Sep 25, 2026	Personal website up and running. I’ll post updates here about publications, talks, and progress on my research projects.

selected publications

PRD

Axial Oscillations of Viscous Neutron Stars

Sofía Bussières, Jaime Redondo-Yuste, José Javier Ortega Gómez, and 1 more author

Phys. Rev. D, 2026

DOI arXiv Bib

@article{axialns2026,
  title = {Axial Oscillations of Viscous Neutron Stars},
  author = {Bussières, Sofía and Redondo-Yuste, Jaime and Gómez, José Javier Ortega and Cardoso, Vitor},
  journal = {Phys. Rev. D},
  volume = {114},
  pages = {044012},
  year = {2026},
  doi = {10.1103/w9nm-ygnf},
  publisher = {American Physical Society,},
}

arXiv

Quantum Signatures of Cosmic Topology: How Casimir Backreaction Transmits Isotropy Violation

COMPACT Collaboration

arXiv e-prints, 2026

arXiv Bib

@article{costopology2026,
  title = {Quantum Signatures of Cosmic Topology: How Casimir Backreaction Transmits Isotropy Violation},
  author = {Collaboration, COMPACT},
  journal = {arXiv e-prints},
  year = {2026},
}