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My research lies at the intersection of gravitational theory, cosmology and astronomical observations. I study how extensions of General Relativity affect the expansion history of the Universe, cosmological perturbations and the formation of large-scale structure.
Current themes include:
modified theories of gravity, especially f(R), f(T) and f(Q) models
interacting dark energy and dark matter
cosmological perturbations and structure growth
black-hole physics and strong-field tests of gravity
cosmological tensions and model discrimination
emerging observations, including DESI and SKA-era science
A central focus of my current work is the Cosmological Consistency Triangle (CCT), a framework that compares background expansion, growth amplitude and a theory-specific third observable to distinguish among cosmological models. My research collaborations extend across the globe.
Publications
Publications
Selected peer-reviewed publications (2025–2026)
Selected peer-reviewed publications (2025–2026)
For the complete, continuously updated publication record, please use the Google Scholar and ORCID links on the homepage.
Marcel van der Westhuizen and Amare Abebe, “Crunching, bouncing, and cyclical cosmologies from dark sector interactions,” Classical and Quantum Gravity 43, 145013 (2026).
Ayodeji Ibitoye et al., “Constraining quintessence models with integrated Sachs–Wolfe–thermal Sunyaev–Zel’dovich cross-correlations,” Physical Review D 113, 063509 (2026).
Shambel Sahlu et al., “Testing the coexistence of dark energy and dark matter with late-time observational data,” Physics of the Dark Universe 52, 102280 (2026).
David Figueruelo et al., “Late-time background constraints on linear and non-linear interacting dark energy after DESI DR2,” Physics of the Dark Universe 52, 102238 (2026).
Amare Abebe et al., “Noncoincidence f(Q)-cosmology with dark matter coupled to gravity,” Fortschritte der Physik 74, e70100 (2026).
Ritesh Pandey et al., “Geodesics and light deflection in Schwarzschild-like spacetime from cosmology-inspired modified gravity,” European Physical Journal C 86, 181 (2026).
Shambel Sahlu et al., “Observational constraints of diffusive dark-fluid cosmology,” Monthly Notices of the Royal Astronomical Society 546, staf1921 (2026).
Marcel van der Westhuizen, Amare Abebe and Eleonora Di Valentino, three-part series on linear and non-linear interacting dark energy, Physics of the Dark Universe 50, 102119–102121 (2025).
Shambel Sahlu, Álvaro de la Cruz-Dombriz and Amare Abebe, “Structure growth in f(Q) gravity,” Monthly Notices of the Royal Astronomical Society 539, 690–703 (2025).
Andronikos Paliathanasis et al., “Challenging ΛCDM with higher-order GUP corrections,” Journal of High Energy Astrophysics 51, 100533 (2025).
Current preprints and scholarly works
Current preprints and scholarly works
Amare Abebe, “The Cosmological Consistency Triangle as a Model-Discrimination Framework,” Preprints 2026, 2026061423.
Shambel Sahlu et al., “Dynamical dark energy in the Bianchi Type-V Universe with DESI DR2 BAO, SNIa compilation and RSD measurements,” arXiv:2607.09718 (2026).
Amare Abebe, “Cosmological tensions as consistency conditions for f(Q) gravity,” arXiv:2604.27773 (2026).
Renier T. Hough et al., “Kosmulator: A Python framework for cosmological inference with MCMC,” arXiv:2602.08424 (2026).
Theses and books
Theses and books
Beyond Concordance Cosmology — PhD thesis, University of Cape Town (2013).
Covariant Gauge-Invariant Perturbations in f(R)-Gravity of Multi-Fluid Cosmologies — MSc dissertation, University of Cape Town (2009).
Beyond Concordance Cosmology — Scholars’ Press, ISBN 978-3-639-76900-5 (2015).
Covariant Perturbations in f(R)-Gravity of Multi-Fluid Cosmologies — LAP Lambert Academic Publishing, ISBN 978-3-8443-1404-5 (2011).
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