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The overarching theme of my research is modified gravitation and cosmology, and involves trying to understand the nature of dark matter and dark energy: two components of the matter-energy content of the universe not well explained by, and definitely not well understood in the context of, General Relativity (GR). In this vein, my research experience and interests include: the so-called f(R), f(T), and f(Q) generalisations to GR and their applications to cosmology, quantum gravity and cosmology, interacting dark-fluid cosmological models, the theory of evolving fundamental ``constants". My growing network of international collaborations has given me the opportunity to work with researchers from over 20 countries across five continents. Part of my envisaged research activities will involve SKA science which, among other things, includes studying the nature and constraints of dark energy, strong-field tests of gravity using pulsars and black holes, and cosmological magnetogenesis.
The overarching theme of my research is modified gravitation and cosmology, and involves trying to understand the nature of dark matter and dark energy: two components of the matter-energy content of the universe not well explained by, and definitely not well understood in the context of, General Relativity (GR). In this vein, my research experience and interests include: the so-called f(R), f(T), and f(Q) generalisations to GR and their applications to cosmology, quantum gravity and cosmology, interacting dark-fluid cosmological models, the theory of evolving fundamental ``constants". My growing network of international collaborations has given me the opportunity to work with researchers from over 20 countries across five continents. Part of my envisaged research activities will involve SKA science which, among other things, includes studying the nature and constraints of dark energy, strong-field tests of gravity using pulsars and black holes, and cosmological magnetogenesis.
Publications
Publications
Regular Articles
Regular Articles
1. Saikat Chakraborty, Peter K. S Dunsby, Rituparno Goswami, and Amare Abebe, A dynamical systems
formulation for inhomogeneous LRS-II spacetimes. J. Cosmol. Astropart. Phys, (2024). Chakraborty,
Saikat, Peter KS Dunsby, Rituparno Goswami, and Amare Abebe. "A dynamical systems formulation for
inhomogeneous LRS-II spacetimes, J. Cosmol. Astropart. Phys, JCAP.... (to appear, 2024)
2. Marcel A. van der Westhuizen and Amare Abebe, Interacting dark energy: clarifying the cosmological implications and viability conditions, J. Cosmol. Astropart. Phys, JCAP01 048 (2024)
3. Ayodeji Ibitoye, Wei-Ming Dai, Yin-Zhe Ma, , Patricio Vielva, Denis Tramonte, Amare Abebe, and Aroonkumar Beesham, Cross-correlation between the thermal Sunayev-Zeldovich effect and the Integrated Sachs-Wolfe effect, Astrophys. J., Suppl. Ser. 270:16 (2024)
4. Mouhssine Koussour, Nurgissa Myrzakulov, Alnadhief HA Alfedeel, and Amare Abebe, Constraining the cosmological model of modified f(Q) gravity: Phantom dark energy and observational insights, Prog. Theor. Exp. Phys 113E01 (2023)
5. Shambel Sahlu, Renier Hough, Heba Sami, Maye Elmardi, Anna-Mia Swart, and Amare Abebe, Confronting the Chaplygin gas with data: background and perturbed cosmic dynamics, Int. J. Mod. Phys. D 32 (13) 2350090 (2023)
6. Nurgissa Myrzakulov, Mouhssine Koussour, Alnadhief HA Alfedeel, and Amare Abebe, Constrained evolution of effective equation of state parameter in non-linear f(R,Lm) dark energy model: Insights from Bayesian analysis of cosmic chronometers and Pantheon samples, Eur. Phys. J. Plus 13 (9) 852 (2023)
7. Guo-JianWang, Cheng Cheng, Yin-Zhe Ma, Jun-Qing Xia, Amare Abebe, and Aroonkumar Beesham, CoLFI: Cosmological Likelihood-free Inference with Neural Density Estimators, Astrophys. J., Suppl. Ser. 268:7 (2023)
8. Değer Sofuoğlu, Alnadhief H. A. Alfedeeli, and Amare Abebe, Cosmographic implications of f(R, T)
gravitation, Eur. Phys. J. Plus 138:696 (2023)
9. Amare Abebe, Alnadhief H. A. Alfedeel, Değer Sofuoğlu, Eltegani I. Hassan, and Rishi K. Tiwari, Perturbations in Bianchi - V spacetimes with varying Λ, G and viscous fluids, Universe 9(2) 61 (2023)
10. Adams Duniya, Amare Abebe, Alvaro de la Cruz-Dombriz, Peter Dunsby, Imprint of f(R) gravity in the cosmic magnification, Mon. Not. R. Astron. Soc 518(4) 6102 (2023)
11. Albert Munyeshyaka, Joseph Ntahompagaze, Manasse Mbonye, Tom Mutabazi, Abraham Ayirwanda, Fidele Twagirayezu, and Amare Abebe, Perturbations in the interacting vacuum, Int. J. Geom. Methods Mod. Phys 20(03) 2350047 (2023)
12. Değer Sofuoğlu, Rishi K. Tiwari, Amare Abebe, Alnadhief H. A. Alfedeel, and Eltegani I. Hassan, Cosmology of a non-minimally coupled f(R, T) gravitation, Physics 4(4) 1348-1358 (2022)
13. Alnadhief H. A. Alfedeel, Rishi K. Tiwari, Değer Sofuoğlu, Amare Abebe, Eltegani I. Hassan, and B. K. Shukla, A cosmological model with time dependent Λ, G and viscous fluid in General Relativity, Front. Astron. Space Sci. 9 965652 (2022)
14. Heba Sami and Amare Abebe, Cosmic hierarchy in f(R) gravity, Int. J. Geom. Methods Mod. Phys. 19 (11) 2250167 (2022)
15. Joseph Ntahompagaze, Amare Abebe, and Manasse Mbonye, Large-scale structure power spectrum from scalar-tensor gravity, Int. J. Mod. Phys. D 31 (09), 2250071 (2022)
16. Alnadhief Alfedeel and Amare Abebe, The evolution of time-dependent Λ and G in multi-fluid Bianchi type-I cosmological models, Open Astronomy 31 198 (2022)
17. Prateek Sharma, Hemwati Nandan, Gamal G. L. Nashed, Shobhit Giri, and Amare Abebe, Geodesics of a Static Charged Black Hole Spacetime in f(R) Gravity, Symmetry 14 309 (2022)
18. Sarfraz Ali, Sarfaraz Khan, Sadia Sattar, and Amare Abebe, The R.nyi holographic dark energy model in Chern-Simons gravity: Some cosmological implications, Int. J. Geom. Methods Mod. Phys. 19 (1)2250001 (2022)
18. Sarfraz Ali, Sarfaraz Khan, Sadia Sattar, and Amare Abebe, The R.nyi holographic dark energy model in
Chern-Simons gravity: Some cosmological implications, Int. J. Geom. Methods Mod. Phys. 19 (1)2250001
(2022)
19. Saheb Soroushfar, Reza Saffari, Amare Abebe, and Haidar Sheikhahmadi, Thermodynamic geometry of
static and rotating regular black holes in conformal massive gravity, Eur. Phys. J. Plus 136 (12) 1223 (2021)
20. Thato Tsabone and Amare Abebe, Dynamical system analysis of the Bianchi type-V cosmological model in
R^n-gravity, Class. Quantum Grav. 38 205004 (2021)
21. Heba Sami, Shambel Sahlu, Amare Abebe, and Peter K. S. Dunsby, Covariant density and velocity perturbations of the quasi-Newtonian cosmological model in f(T) gravity, Eur. Phys. J. C 81 872 (2021)
22. Amare Abebe, Mudhahir Al Ajmi, Maye Elmardi, Hemwati Nandan, and Noor ul Sabah, Shear-free
conditions of a Chaplygin-gas-dominated universe, Int. J. Geom. Methods Mod. Phys. 18 (12) 2150192 (2021)
23. Heba Sami and Amare Abebe, Perturbations of quasi-Newtonian universes in scalar-tensor gravity, Int. J.
Geom. Methods Mod. Phys. 18 (10) 2150158 (2021)
24. Shambel Sahlu, Joseph Ntahompagaze, Amare Abebe, and DavidMota, Inflationary constraints in teleparallel
gravity theory, Int. J. Geom. Methods Mod. Phys. 18 (02) 2150027 (2021)
25. Joseph Ntahompagaze, Shambel Sahlu, Amare Abebe, and Manasse Mbonye, On multifluid perturbations in scalar-tensor cosmology, Int. J. Mod. Phys. D 20 50120 (2020)
26. Gamal Nashed, Amare Abebe, and Kazuharu Bamba, Neutral physical compact spherically symmetric stars
with non-exotic matters in Einstein’s cluster model using Weitzenb.ck geometry, Eur. Phys. J. C 80 1109
(2020)
27. Pankaj Sheoran, Hemwati Nandan, Eva Hackmann, Ulises Nucamendi, and Amare Abebe, Schwarzschild
black hole surrounded by quintessential matter field as an accelerator for spinning particles, Phys. Rev. D
102, 064046 (2020)
28. Prateek Sharma, Hemwati Nandan, Radouane Gannouji, Rashmi Uniyal, and Amare Abebe, Deflection of
light by a rotating black hole surrounded by “quintessence", Int. J. Mod. Phys. A 35 (26) 2050155 (2020)
29. Renier Hough, Amare Abebe, Stefan Ferreira, Viability tests of f(R)-gravity models with Supernovae Type
1A data, Eur. Phys. J. C 80 787 (2020)
30. Shambel Sahlu, Joseph Ntahompagaze, Amare Abebe, .lvaro de la Cruz-Dombriz, and David F. Mota,
Scalar perturbations in f(T) gravity using the 1 + 3 covariant approach, Eur. Phys. J. C 80 422 (2020)
31. Alnadhief Alfedeel, Amare Abebe, Bianchi type-V solutions with varying G and Λ: The general case, Int. J.
Geom. Methods Mod. Phys. 17 2050076 (2020)
32. Haidar Sheikhahmadi, Abolhassan Mohammadi, Ali Aghamohammadi, Tiberiu Harko, Ramon Herrera,
Christian Corda, Amare Abebe, and Khaled Saaidi, Constraining chameleon field driven warm inflation
with Planck 2018 data, Eur. Phys. J. C 79 1038 (2019)
33. Shambel Sahlu, Joseph Ntahompagaze, Maye Elmardi, and Amare Abebe, The Chaplygin gas as a model for
modified teleparallel gravity?, Eur. Phys. J. C, 79 749 (2019)
34. Joseph Ntahompagaze, Jean Mbarubucyeye, Shambel Sahlu, and Amare Abebe, Inflation constraints for
classes of f(R) models, Int. J. Geom. Methods Mod. Phys., 15 1850209 (2018)
35. Alnadhief Alfedeel, Amare Abebe, and Hussam Gubara, A Generalized Solution of Bianchi Type-V Models
with Time-Dependent G and Λ, Universe 4(8), 83 (2018)
36. Heba Sami and Amare Abebe, Quasi-Newtonian Cosmological Models in Scalar-Tensor Theories of Gravity,
Lett. High En. Phys. 1 (1), 21-27 (2018)
37. Joseph Ntahompagaze, Amare Abebe, and Manasse Mbonye, A study of perturbations in scalar-tensor
theory using the 1 + 3 covariant approach, Int. J. Mod. Phys. D 27 1850033 (2018)
38. Heba Sami, Neo Namane, Joseph Ntahompagaze, Maye Elmardi, and Amare Abebe, Reconstructing f(R)
gravity from a Chaplygin scalar field in de Sitter spacetimes, Int. J. Geom. Methods Mod. Phys. 15 18500275
(2018)
39. Heba Sami, Joseph Ntahompagaze, and Amare Abebe, Inflationary f(R) Cosmologies, Universe 3(4), 73
(2017)
40. Joseph Ntahompagaze, Amare Abebe, and Manasse Mbonye, On gravity in scalar-tensor theories, Int. J.
Geom. Methods Mod. Phys. 14 1750107 (2017)
41. Amare Abebe, Peter K. S. Dunsby and Deon Solomons, Integrability conditions of quasi-Newtonian
cosmologies in modified gravity, Int. J. Mod. Phys. D 26 1750054 (2017)
42. Maye Elmardi, Amare Abebe, and Abiy Tekola, Chaplygin-gas solutions of f(R) gravity, Int. J. Geom. Methods
Mod. Phys. 13 1650120 (2016)
43. Amare Abebe, Davood Momeni, and Ratbay Myrzakulov, Shear-free anisotropic cosmological models in
f(R) gravity Gen. Relativ. Grav. 48(4):1-17 (2016)
44. Amare Abebe and Maye Elmardi, Irrotational-fluid cosmologies in fourth-order gravity, Int. J. Geom. Methods
Mod. Phys. 12 1550118 (2015)
45. Amare Abebe, Breaking the cosmological background degeneracy by two-fluid perturbations in f(R)
gravity, Int. J. Mod. Phys. D 24 1550053 (2015)
46. Amare Abebe, Anti-Newtonian cosmologies in f(R) gravity, Class. Quantum Grav. 31 115011 (2014)
47. Amare Abebe, Alvaro de la Cruz-Dombriz and Peter K. S. Dunsby, Large scale structure constraints for a
class of f(R) theories of gravity, Phys. Rev. D 88 044050 (2013)
48. Amare Abebe, Mohamed Abdelwahab, Alvaro de la Cruz-Dombriz, and Peter K. S. Dunsby, Covariant
gauge-invariant perturbations in multifluid f(R) gravityPhys. Rev. D Class. Quantum Grav. 29 135011 (2012)
49. Amare Abebe, Rituparno Goswami and Peter K. S. Dunsby, Shear-free perturbations of f(R) gravity, Phys.
Rev. D 84, 124027 (2011)
Conference Proceedings
Conference Proceedings
Edmund Kyazze and Amare Abebe, On the Rh = ct universe, SA Inst. Phys. Proceedings, ISBN: 978-0-7961-3774-6, SAIP2023 (2023)
George Mbewe, Remudin Mekuria, Shambel Sahlu, and Amare Abebe, Viscous cosmological fluids and large-scale structure, SA Inst. Phys. Proceedings, ISBN: 978-0-7961-3774-6, SAIP2023 (2023)
Amare Abebe, Dark-fluid constraints of shear-free universes, Proceedings of the African Conference on Fundamental and Applied Physics (ACP2021), arXiv [gr-qc]:2205.11471 (2022)
Amare Abebe, Matters of the Rh = ct universe, SA Inst. Phys. Proceedings, ISBN: 978-0-6397-4426-1, SAIP2022 (2022)
George Mbewe and Amare Abebe, Interacting viscous dark cosmology, SA Inst. Phys. Proceedings, ISBN: 978-0-6397-4426-1, SAIP2022 (2022)
Marcel van der Westhuizen and Amare Abebe, Dark coupling: cosmological implications of interacting dark energy and dark matter fluids, SA Inst. Phys. Proceedings, ISBN: 978-0-620-97693-0, SAIP2021 (2021)
Thato Tsabone and Amare Abebe, Bianchi Type-V model in Rn-gravity: A dynamical systems approach, SA Inst. Phys. Proceedings, ISBN: 978-0-620-97693-0, SAIP2021 (2021)
Heba Sami and Amare Abebe, Cosmological Models in Gravitational Scalar-Tensor Theories, SA Inst. Phys. Proceedings, ISBN: 978-0-620-97693-0, SAIP2021 (2021)
Shambel Sahlu, Joseph Ntahompagaze, Amare Abebe, David Mota, Accelerating universe in modified teleparallel gravity theory, IAU Proceedings: Nuclear Activity in Galaxies Across Cosmic Time, Cambridge University Press (2020)
Renier Hough, Amare Abebe, and Stefan Ferreira, Constraining f(R)-gravity models with recent cosmological data, SA Inst. Phys. Proceedings, ISBN: 978-0-620-88875-2, SAIP2019 (2020)
Anna-Mia Swart, Renier Hough, Shambel Sahlu, Heba Sami, Thato Tsabone, Rubby Aworka, Maye Elmardi, and Amare Abebe, Unifying dark matter and dark energy in Chaplygin gas cosmology, SA Inst. Phys. Proceedings, ISBN: 978-0-620-88875-2, SAIP2019 (2020)
Shambel Sahlu, Heba Sami, Anna-Mia Swart, Thato Tsabone, Maye Elmardi, and Amare Abebe, Perturbations in a Chaplygin gas Cosmology, SA Inst. Phys. Proceedings, ISBN: 978-0-620-88875-2, SAIP2019 (2020)
Neo Namane, Heba Sami and Amare Abebe, Oscillating cosmological correlations in f(R) gravity, SA Inst. Phys. Proceedings, ISBN: 978-0-620-85406-1, SAIP2018 (2019)
Amare Abebe, Constraining Gravitational Models using Cosmological Integrability Conditions, Andromeda Proceedings, BSM2017 (2018)
Heba Sami and Amare Abebe, SA Inst. Phys. Proceedings, ISBN: 978-0-620-82077-6, SAIP2017 (2018)
Maye Elmardi and Amare Abebe, Cosmological Chaplygin gas as modified gravity, J. Phys. Conf. Ser. 905012015 (2017)
Amare Abebe, Davood Momeni and Ratbay Myrzakulov, Anisotropic solutions in modified gravity, J. Phys. Conf. Ser. 905, 012014 (2017)
Amare Abebe, Existence of anti-Newtonian solutions in fourth-order gravity, SA Inst. Phys. Proceedings, ISBN: 978-0-620-77094-1, SAIP2016 (2017)
Maye Elmardi and Amare Abebe, Integrability conditions for nonrotating solutions in f(R) gravity, SA Inst. Phys. Proceedings, ISBN: 978-0-620-77094-1, SAIP2016 (2017)
Amare Abebe, Rituparno Goswami and Peter K. S. Dunsby, Simultaneous expansion and rotation of shear-free universes in modified gravity, AIP Conf. Proc. 1458 307 (2012)
Theses
Theses
Beyond Concordance Cosmology (PhD thesis, University of Cape Town, 2013)
Covariant Perturbations in f(R)-Gravity of Multi-Fluid Cosmologies ((MSc dissertation, University of Cape Town, 2009)
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