Amare Abebe is currently an Associate Professor of Physics at North-West University. He completed his BSc (2006) in Physics and Mathematics at Addis Ababa University, and joined the University of Cape Town to study towards his MSc (2009) and PhD (2013) in Cosmology.
My current research interests revolve around explaining away the dark sector (dark matter and dark energy) using alternative gravitational physics. This includes cosmological studies of modified gravity theories, dark fluid cosmological models, and interacting dark fluid mechanisms.
DISCIPLINE: Theoretical Physics
TOP 10 PUBLICATIONS
- Abebe, A., Abdelwahab, M., De la Cruz-Dombriz, A. and Dunsby, P.K., 2012. Covariant gauge-invariant perturbations in multifluid f(R) gravity. Classical and Quantum Gravity, 29(13), p.135011.
- Abebe, A., de la Cruz-Dombriz, A. and Dunsby, P.K., 2013. Large scale structure constraints for a class of f(R) theories of gravity. Physical review D, 88(4), p.044050.
- Abebe, A., 2014. Anti-Newtonian cosmologies in f(R) gravity. Classical and Quantum Gravity, 31(11), p.115011.
- Sheikhahmadi, H., Mohammadi, A., Aghamohammadi, A., Harko, T., Herrera, R., Corda, C., Abebe, A. and Saaidi, K., 2019. Constraining chameleon field driven warm inflation with Planck 2018 data. The European Physical Journal C, 79(12), pp.1-17.
- Ntahompagaze, J., Abebe, A. and Mbonye, M., 2017. On f(R) gravity in scalar–tensor theories. International Journal of Geometric Methods in Modern Physics, 14(07), p.1750107.
- Sahlu, S., Ntahompagaze, J., Abebe, A., de la Cruz-Dombriz, Á. and Mota, D.F., 2020. Scalar perturbations in f(T) gravity using the 1+ 3 covariant approach. The European Physical Journal C, 80(5), pp.1-19.
- Abebe, A., Goswami, R. and Dunsby, P.K., 2011. Shear-free perturbations of f(R) gravity. Physical Review D, 84(12), p.124027.
- Hough, R.T., Abebe, A. and Ferreira, S.E.S., 2020. Viability tests of f(R)-gravity models with Supernovae Type 1A data. The European Physical Journal C, 80(8), pp.1-15.
- Elmardi, M., Abebe, A. and Tekola, A., 2016. Chaplygin-gas solutions of f(R) gravity. International Journal of Geometric Methods in Modern Physics, 13(10), p.1650120.
- Sami, H., Ntahompagaze, J. and Abebe, A., 2017. Inflationary f(R) cosmologies. Universe, 3(4), p.73.
LIST OF PUBLICATIONS
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Prof Jacek Banasiak (UP)
Prof Igor Barashenkov (UCT)
Dr Bruce Bartlett (SU)
Prof Bruce A Bassett (AIMS) (SAAO) (UCT)
Prof Aroon Beesham (Mangosuthu University of Technology)
Nigel Bishop was born in England, and studied at the University of Cambridge. He was tutored by someone who would become the most famous relativists of our time, Stephen Hawking. He obtained the BA (Honours) degree in mathematics, and moved to the University of Southampton obtaining the PhD degree in 1976.
At the same time he was elected a Fellow of the Royal Astronomical Society.
He was appointed as a lecturer at the University of the Witwatersrand, and his first appointment as full Professor was at UNISA in 1992. In 2009 he moved to Rhodes University as Professor and Head of Department of Mathematics. He retired in 2016, and is currently Emeritus Professor
He has held several visiting appointments: England: University of Cambridge, University of Southampton; Germany: Max-Planck Institute for Gravitational Physics; India: Inter-University Centre for Astronomy and Astrophysics; Turkey: Sabanci University, USA: University of Pittsburgh, Louisiana State University, California Institute of Technology.
He has served as President of the South African Gravity Society. For many years he has been on the Council of the South African Mathematical Society, serving two terms as President. Internationally, he serves on the Council of the International Society on General Relativity and Gravitation.
He is the author or co-author of over 70 scientific publications, and 3 books. The subjects of this work range from mathematical analysis to computer programming, from quantum gravity to discoveries about the horizons of black holes, and from cosmology to the theory of travel faster than light. However, for about the last 30 years the focus of his work has been on gravitational waves, and in particular how they are calculated.
TOP 10 PUBLICATIONS
- N T Bishop & P T Landsberg Equivalence Principle – 60 years of a misuse? Nature 252 459-460 (1974)
- N T Bishop The closed trapped region and the apparent horizon of two Schwarzschild black holes Gen. Rel. Grav. 14 717-723 (1982)
- N T Bishop Is superluminal travel a theoretical possibility? Found. Phys. 14 333-340 (1984)
- N T Bishop Numerical relativity: combining the Cauchy and characteristic initial value problems Class. Quant. Grav. 10 333-341 (1993)
- N T Bishop, R Gomez, L Lehner, M Maharaj & J Winicour High-powered gravitational news Phys. Rev. D 56 6298-6309 (1997)
- N T Bishop Linearized solutions of the Einstein equations within a Bondi-Sachs framework, and implications for boundary conditions in numerical simulations, Class. Quant. Grav. 22 2393-2406 (2005)
- C Reisswig, N T Bishop, D Pollney and B Szilagyi, Unambiguous determination of gravitational waveforms from binary black hole mergers, Phys. Rev. Lett., 103 221101 (2009)
- H L Bester, J Larena & N T Bishop Towards the geometry of the Universe from data Mon. Not. R. astr. Soc. 453, 2364-2377 (2015)
- N T Bishop & L Rezzolla Extraction of Gravitational Waves in Numerical Relativity Living Rev. Relativity, http://dx.doi.org/10.1007/s41114-016-0001-9 (2016)
- NT Bishop, PJ van der Walt and M Naidoo Effect of a low density dust shell on the propagation of gravitational waves arXiv:1912.08289, Gen. Rel. Grav. 52 92 (2020)
- LINK TO PUBLICATIONS DOI/ARXIV
- LINK TO PUBLICATION 3: DOI/ARXIV
- LINK TO PUBLICATION 10: DOI/ARXIV
- LINK TO PUBLICATION 3: DOI/ARXIV COPY 6
- LINK TO PUBLICATION 3: DOI/ARXIV COPY 5
- LINK TO PUBLICATION 3: DOI/ARXIV COPY 4
- LINK TO PUBLICATION 3: DOI/ARXIV COPY 3
- LINK TO PUBLICATION 3: DOI/ARXIV COPY 2
- LINK TO PUBLICATION 3: DOI/ARXIV COPY
Prof Moritz Braun (UNISA)
Dr Jeandrew Brink (UOFS)
Prof Erwin Bruning (UKZN)
Prof Martin Bucher (UKZN)
Prof Nithaya Chetty (WITS)
Dr Hsin Cynthia Chang (UKZN)
Dr Chris Clarkson (UCT)
Prof Jean Cleymans (UCT)
Prof Alan Cornell (UJ)
Prof Riaan de Jongh (NWU)
Dr Alvaro de la Cruz Dombriz (UCT)
Prof Robert de Mello Koch (WITS)
Prof Cesareo A Dominguez (UCT)
Prof Peter Dunsby (UCT)
Dr Rocco Duvenhage (UP)
Prof Hans Eggers (SU)
Prof George Ellis (UCT)
Prof Francois A. Engelbrecht (WITS)
Prof Artur Every (WITS)
Prof Stefan Ferreira (NWU)
Dr Kevin Goldstein (WITS)
Dr Filippo Giraldi (UKZN)
Prof Freedom Gumedze (UCT)
Prof W Dieter Heiss (SU)
Prof Manfred Hellberg (UKZN)
Dr Gregory Hillhouse (UZULU)
Dr Shinji Hirano (WITS)
Prof Vishnu Jejjala (WITS)
Dr Anslyn John (SU)
Prof Daniel Joubert (WITS)
Prof Steven Karataglidis (UJ)
Prof Steven Karataglidis (UJ)
Dr Hannes Kriel (SU)
Prof Thomas Konrad (UKZN)
Dr Julien Larena (RU)
Prof Mantile Lekala (UNISA)
Dr Yin-Zhe Ma (UKZN)
Prof Roy Maartens (UWC)
Prof Richard Mace (UKZN)
Prof Sunil Maharaj (UKZN)
Prof Oluwole Daniel Makinde (SU)
Prof Rapela Regina Maphanga (CSIR)
Dr Refilwe Edwin Maphasha (UP)
Prof Alan Joseph Micheal Medved (RU)
Dr Shazrene Mohamed (SAAO)
Prof Kavilan Moodley (UKZN)
Prof Kristian Muller-Nedebock (SU)
Prof Azwinndini Muronga (NMU)
Prof Jeff Murugan (UCT)
Dr Monica Mwale (SANBI)
Dr Giuseppe Pellicane (UKZN)
Prof Andre Peshier (UCT)
Prof Denis Pollney (RU)