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Prof. Aroonkumar Beesham
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13Years (2014-Present)
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Representative Publications
View All Publications17 November 2018 in The European Physical Journal C
Journal Article
RNRitika Nagpal
Ritika Nagpal
Shibesh Kumar Jas PacifJSJ. K. Singh
J. K. Singh
Kazuharu BambaABAroonkumar Beesham
Aroonkumar BeeshamAn exact cosmological solution of Einstein’s field equations (EFEs) is derived for a dynamical vacuum energy in f( R, T) gravity for Friedmann–Lemaitre–Robertson–Walker (FLRW) space-time. A...
17 April 2018 in The European Physical Journal C
Journal Article
The construction of exact solutions in scalar field inflationary cosmology is of growing interest. In this work, we review the results which have been obtained with the help of one of the most...
7 June 2023 in Annals of Physics
Journal Article
JSJainendra Kumar Singh
Jainendra Kumar SinghSHShaily
Shaily
ASAkanksha Singh
Akanksha SinghABAroonkumar Beesham
Aroonkumar BeeshamHSHamid Shabani
Hamid Shabani2 July 2014 in Physical Review D
Journal Article
GAGiovanni Acquaviva
Giovanni AcquavivaABAroonkumar Beesham
Aroonkumar BeeshamIn the context of dark energy solutions, we consider a Friedmann—Robertson—Walker spacetime filled with a noninteracting mixture of dust and a viscous fluid, for which the bulk viscosity is governed by the nonlinear model proposed in [R. Maartens and V. Méndez, Phys. Rev. D 55, 1937 (1997)]. Through a phase-space analysis of the equivalent dynamical system, the existence and stability of critical solutions are established, and the respective scale factors are computed. The results point toward the possibility of describing the current accelerated expansion of the Universe by means of the above-mentioned nonlinear model for viscosity.
15 July 2020 in Astrophysics and Space Science
Journal Article
VSVIJAY SINGH
VIJAY SINGHABAroonkumar Beesham
Aroonkumar Beesham15 October 2015 in Classical and Quantum Gravity
Journal Article
GAGiovanni Acquaviva
Giovanni AcquavivaABAroonkumar Beesham
Aroonkumar BeeshamWe consider a Friedmann–Robertson–Walker spacetime filled with both viscous radiation and nonviscous dust. The former has a bulk viscosity that is proportional to an arbitrary power of the energy density, i.e. and viscous pressure satisfying a nonlinear evolution equation. The analysis is carried out in the context of dynamical systems and the properties of solutions corresponding to the fixed points are discussed. For some ranges of the relevant parameter ν we find that the trajectories in the phase space evolve from a FRW singularity towards an asymptotic de Sitter attractor, confirming and extending previous analysis in the literature.
About Me
Prof. Aroonkumar Beesham is currently a Research Fellow at the Faculty of Natural Sciences, Mangosuthu University of Technology, Jacobs, South Africa. Prof. Beesham was formerly a Senior Professor in the Department of Mathematical Sciences and has been in academia for many years. From 1979 to 1989, he served as a Lecturer at the University of Durban-Westville (now, the Westville campus of the University of KwaZulu-Natal) and the University of Zululand. He received his PhD degree from the University of Cape Town (UCT). Currently, his research interests mainly include Cosmology, Dark Energy, Black Holes, and the Mathematical modelling of COVID-19. He is a member of the South African Maths Society, South African Institute of Physics, International Society of General Relativity & Gravitation, Australasian Society for General Relativity and Gravitation, and Royal Astronomical Society, Indian Association for General Relativity and Gravitation.