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

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.