Sebastian Bahamonde

Senior Research Fellow · Institute for Basic Science (IBS), CTPU-CGA · Daejeon, South Korea

Welcome

I am a Chilean theoretical physicist working on gravitation, cosmology and relativistic astrophysics. My research focuses on geometric extensions of General Relativity and their applications to black holes, compact objects, cosmology and gravitational-wave signatures.

Sebastian Bahamonde

Research interests

  • Metric-affine gravity

    Gravity with an independent affine connection, where torsion and nonmetricity can become dynamical.

  • Teleparallel gravity

    Curvature-free formulations of gravity and their extensions to cosmology, black holes and gravitational waves.

  • Black holes

    Exact solutions, regular cores, scalar hair, torsion and nonmetricity charges, and observational degeneracies.

  • Cosmology and waves

    Cosmological perturbations, extra gravitational degrees of freedom, propagation and polarization signatures.

News

KPS Fall Meeting 2026 — Jeju

I gave an invited talk entitled Non-Riemannian Black Holes: From Geometric Charges to Regular Torsion Hair at the 2026 Fall Meeting of the Korean Physical Society, held at ICC Jeju, South Korea, in October 2026.
In the media New Scientist (2021)Explora Chile (2014)

Selected recent publications

Complete list →
  1. Geometrically Regular Black Holes with Hedgehog Scalar Hair,S. Bahamonde, Phys. Rev. D 114 (2026) 2, 024016, [arXiv:2604.15758 [gr-qc]].
  2. Gravitational waves in Cubic Metric-Affine Gravity,S. Bahamonde, J. Gigante Valcarcel and J. M. M. Senovilla, Phys. Rev. D 114 (2026), 024027, [arXiv:2511.03574 [gr-qc]].
  3. A gravitational spin-orbit interaction in Poincaré gauge theory,S. Bahamonde and J. Gigante Valcarcel, Phys. Lett. B 873 (2026), 140126, [arXiv:2508.20035 [gr-qc]].
  4. Coupling electromagnetism to torsion: Black holes and spin-charge interactions,S. Bahamonde, J. Maggiolo and C. Pfeifer, Phys. Rev. D 113 (2026) no.4, 4, [arXiv:2507.02362 [gr-qc]].
  5. Cosmology of cubic Poincaré gauge gravity,S. Bahamonde, R. Briffa, K. Dialektopoulos, D. Iosifidis and J. Levi Said, Phys. Dark Univ. 52 (2026), 102249, [arXiv:2506.17017 [gr-qc]].

Biography

I am a Chilean theoretical physicist currently based in Daejeon, South Korea. I am a Senior Research Fellow at the Institute for Basic Science (IBS), working in the Center for Theoretical Physics of the Universe: Cosmology, Gravity and Astroparticle Physics Group (CTPU-CGA).

I began my academic path at the Universidad de Concepción in Chile, where I obtained my BSc in Physical Science, my MSc in Physics, and my professional degree in Astronomy. During this period I developed my interest in gravitation, cosmology and relativistic astrophysics. My MSc research focused on dynamical wormholes in General Relativity.

After my MSc, I worked as a Physics Teaching Fellow at the Universidad de Los Lagos in Puerto Montt, Chile. Supported by the BECAS CHILE scholarship, I then completed a PhD in Mathematics at University College London (UCL), working on theoretical gravity and cosmology.

After my PhD, I held research and teaching-related positions in the United Kingdom, Estonia and Japan. I worked as an Isaac/Ogden Fellow at the University of Lincoln, in partnership with Isaac Physics, the Ogden Trust and the University of Cambridge. I then moved to the University of Tartu as a Mobilitas Pluss Postdoctoral Fellow, later to Tokyo Institute of Technology as a JSPS Postdoctoral Fellow, and then to Kavli IPMU, University of Tokyo, before joining IBS.

My work has developed from modified teleparallel cosmology to broader non-Riemannian and gauge-theoretic formulations of gravity, including metric-affine gravity, Poincaré gauge theory, black-hole solutions, cosmological perturbations and gravitational-wave signatures.