Conveners
Theoretical and Computational Physics
- Alan Cornell (University of Johannesburg)
Theoretical and Computational Physics
- Mukesh Kumar (University of the Witwatersrand)
Theoretical and Computational Physics
- William Horowitz (University of Cape Town)
Theoretical and Computational Physics
- Azwinndini Muronga (University of Johannesburg)
Theoretical and Computational Physics
- Moritz Braun (University of South Africa)
Theoretical and Computational Physics
- PAllab BAsu (Senior Lecturer)
Theoretical and Computational Physics
- DAWIT WORKU (Cape Peninsula University of Technology)
Theoretical and Computational Physics
- Alan Cornell (University of Johannesburg)
Mr
Thendo Emmanuel Nemakhavhani
(University of Johannesburg)
09/07/2019, 10:00
Track G - Theoretical and Computational Physics
Oral Presentation
The Equation of State (EoS) of a hot and dense hadron matter is studied using a microscopic transport model which can support the Large Hadron Collider energies of up to √(s_nn )= 14 TeV, namely the Ultra-relativistic Quantum Molecular Dynamics (UrQMD). The molecular dynamics simulation is performed for a system of light meson species (π; ρ; K) in a box with periodic boundary conditions. The...
Dr
Mohammed Younus
(Nelson Mandela University)
09/07/2019, 10:20
Track G - Theoretical and Computational Physics
Oral Presentation
Third order non-equilibrium fluid dynamics as an extension of Muller-Israel-Stewart theory for dissipative relativistic fluids have been derived using Grad's 14-moments techniques. We have tried to calculate transport coeffcients for shear, bulk pressures and heat flow as well as pressure anisotropy for relativistic dissipative fluids.
Mr
Blessed Ngwenya
(University of Cape Town)
09/07/2019, 10:40
Track G - Theoretical and Computational Physics
Oral Presentation
Heavy ion collisions at RHIC and at the LHC produce an enormous amount of energy that enables the nuclei and its constituent particles to melt, thus releasing gluons, quarks and antiquarks, travelling in different directions with different momenta. Studies of these collisions have shown that low transverse momentum observables describe a strongly coupled plasma (quark-gluon plasma), an almost...
Ms
Nadia Barnard
(University of Cape Town)
09/07/2019, 11:20
Track G - Theoretical and Computational Physics
Oral Presentation
We compute for the first time the suppression of bottomonia in a strongly coupled QGP and compare the results to those from a weakly coupled QGP and to data. Using imaginary time techniques we numerically determine the real and imaginary parts of the binding energy of ground state bottomonia in a potential computed from AdS/CFT and another computed from pQCD. We implement the complex binding...
Dr
DAWIT WORKU
(Cape Peninsula University of Technology)
, Prof.
Jean Cleymans
(University of Cape Town)
, Mr
Masimba Wellington Paradza
(UCT-CERN)
09/07/2019, 11:40
Track G - Theoretical and Computational Physics
Oral Presentation
We have analyzed and discussed the hadronic abundances measured in Au-Au, p-p and Pb-Pb collisions at RHIC and LHC experiments using THERMUS. The results were obtained with two particle data tables, and their differences were explained. In particular, the data from the RHIC experiment for Au-Au collisions at 130 GeV and 200 GeV were discussed and analyzed. Similarly, using the preliminary...
Dr
PAllab BAsu
(Senior Lecturer)
09/07/2019, 12:00
Track G - Theoretical and Computational Physics
Oral Presentation
Using complex Langevin dynamics and stochastic quantization we examine the phase structure of a large N unitary matrix model at low temperature with finite quark chemical potential. This model is obtained as the low temperature effective theory of QCD with N number of colors and N_f number of quark flavors. We simulate several observables of the model, including Polyakov lines and quark number...
Prof.
Azwinndini Muronga
(Nelson Mandela University)
09/07/2019, 12:20
Track G - Theoretical and Computational Physics
Oral Presentation
I will give a review of the nuclear equation of state and transport properties of matter in heavy ion collisions (HIC) and binary neutron star collisions. I will also point out the significance of the equation of state (EoS) and transport coefficients for HIC and astrophysical observables.
I will try to focus on general methods and principles but also touch on specific open questions for...
Mr
Theodore Gaelejwe
(University of the Witwatersrand)
09/07/2019, 12:40
Track G - Theoretical and Computational Physics
Oral Presentation
The Large Hadron Collider (LHC) generates petabytes of data during each data taking period and machine learning (ML) techniques are required to analyse this data. In particular, Boosted Decision Trees (BDTs) have been the de-facto standard ML tool for this task. However, in the recent past, more modern techniques such as Deep Learning have emerged and there has been growing justification for...
Dr
Mukesh Kumar
(University of the Witwatersrand)
10/07/2019, 10:00
Track G - Theoretical and Computational Physics
Oral Presentation
We consider simplified dark matter models (DM) interacting gravitationally with the Standard Model particles in a Randall-Sundrum (RS) frame work. In this frame work the DM particles interact through the exchange of spin-2 Kaluza-Klein (KK) gravitons in the $s$-channel with the SM particles. The parameter space of RS model with universal couplings to SM particles is known to be strongly...
Mr
Lutendo Nyadzani
(Centre for Astro-Particle Physics and Department of Physics, University of Johannesburg, Auckland Park 2006, South Africa)
10/07/2019, 10:20
Track G - Theoretical and Computational Physics
Oral Presentation
When two compact objects such as black holes, white dwarfs, and neutron stars orbit a common centre of gravity, they emit energy in the form of gravitational waves (GW). The emission of GW will result in the two objects coalescing. In this work, we present the empirical calculation of the coalescence rate of binary neutron stars. We have included new important results in our input physics in...
Ms
Isobel Kolbe
(University of Cape Town)
10/07/2019, 10:40
Track G - Theoretical and Computational Physics
Oral Presentation
At the Large Hadron Collider (LHC) in Geneva, Switzerland and the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory in the United States, it is widely believed that a new state of matter, the Quark-Gluon Plasma (QGP), is routinely created by colliding the nuclei of heavy elements such as gold or lead at nearly the speed of light. In head-on collisions between heavy...
Prof.
Alan Cornell
(University of Johannesburg)
10/07/2019, 11:20
Track G - Theoretical and Computational Physics
Oral Presentation
We discuss the computation of the Coleman Weinberg effective potential in an SU(3)W × SU(3)C gauge Higgs model in five dimensions. We attempt to compute the Higgs mass in this model, where we had previously calculated the unification of the gauge and top-like Yukawa couplings.
Ms
Lara Mason
(SA-CERN)
10/07/2019, 11:40
Track G - Theoretical and Computational Physics
Oral Presentation
Composite Higgs studies, where the Higgs boson emerges as a pseudo-Nambu-Goldstone boson after the breaking of the global symmetry group, present a BSM solution to issues such as the hierarchy problem. In such models, the Higgs is described as a bound state of a confining "strong" force. Here, we investigate the phenomenology of a model with a non-minimal group structure, where the Yukawa...
Dr
Mukesh Kumar
(University of the Witwatersrand)
10/07/2019, 12:00
Track G - Theoretical and Computational Physics
Oral Presentation
The disagreement between experimental and Standard Model prediction of muon anomalous magnetic moment at the level of 3-4$\sigma$ is well known. In a two Higgs doublet model with a singlet scalar (2HDM+S), we investigate the possible parameter space of all four types of this model to explain this discrepancy. Further we also analyse the sizeable effect of electric dipole moment within this model.
Dr
William Horowitz
(University of Cape Town)
10/07/2019, 12:20
Track G - Theoretical and Computational Physics
Oral Presentation
We compute the emission spectrum of soft and collinear gluon bremsstrahlung radiation associated with the hard scattering of a quark by a gluon in QCD for one, two, and three gluons. In QED, multiple photon emissions are independent, which is to say they are emitted according to a Poisson distribution. In QCD, the non-Abelian nature of the theory leads to interactions between the emitted...
Ms
Sukanya Sinha
(The University of Witwatersrand)
10/07/2019, 12:40
Track G - Theoretical and Computational Physics
Oral Presentation
Beginning with a brief discussion on the spontaneous symmetry breaking of global and local symmetries, the amplitude for production of Higgs boson via the most dominant channel, i.e., gluon fusion, has been calculated. The expression for the amplitude in terms of general arbitrary top quark masses give rise to some dilogarithmic integrals, which can be difficult to evaluate, and hence, the...
Dr
Makhamisa Senekane
(Department of Physics and Electronics, National University of Lesotho, Roma, Lesotho)
10/07/2019, 14:00
Track G - Theoretical and Computational Physics
Oral Presentation
Topology is a branch of mathematics that studies the properties that remain invariant under continuous deformations (deformations that do not include ``cutting'' or ``tearing''). Interest in topological ideas in physics originated in the field of condensed matter physics with the exploration and discovery of topological phases of matter. Furthermore, topology was adopted in quantum computation...
Dr
Camille Lombard Latune
(UKZN)
10/07/2019, 14:20
Track G - Theoretical and Computational Physics
Oral Presentation
Several promising innovations in quantum thermodynamics and more generally in quantum technologies rely on the use of quantum coherences. However, it is far from obvious how coherences, most of the time assumed to be present initially, are supposed to be prepared and what would be the associated energetic and/or entropic costs. These are important questions which might challenge the...
220.
Analytical and Numerical Approaches to the quantum optical implementation of Open Quantum Walks
Mr
Ayanda Zungu
(Department of Physics, North-West University, Mafikeng Campus)
10/07/2019, 14:40
Track G - Theoretical and Computational Physics
Oral Presentation
Open quantum walks (OQWs) have been introduced as a type of quantum walks which are entirely driven by the dissipative interaction with external environments and are defined in terms of discrete completely positive maps on graphs [1]. In my talk, I shall give a brief overview of the microscopic derivation of OQWs [2] and propose a single atom quantum maser scheme [3] that to implement...
Mr
Hazmatally Goolam Hossen
(UKZN)
10/07/2019, 15:00
Track G - Theoretical and Computational Physics
Oral Presentation
A model of a non-repeating quantum walk is formulated in 2D using the formalism of Open Quantum Walks (OQWs) [1]. During the non-repeating quantum walk, the particle changes direction at every step and does not go to an already visited site. To achieve this dynamics of the walker all visited sites are recorded using a memory system. In the model which we developed “quantum coins'' are composed...
Mr
Jonathan Hartman
(University of Johannesburg)
10/07/2019, 15:40
Track G - Theoretical and Computational Physics
Oral Presentation
In quantum mechanics, the phenomenon described by the situation of two particles correlated in such a way that when the spin of one is measured, the other is immediately known, is called quantum entanglement. This phenomenon was first described by Einstein in an argument put forth in the now famous EPR paper to express his misgivings and what he saw as the fundamental problems with quantum...
Dr
Richard Ocaya
(UFS, Department of Physics)
11/07/2019, 10:00
Track G - Theoretical and Computational Physics
Oral Presentation
We suggest a novel approach to investigate phonon propagation in an FCC lattice through bond length oscillations in response to a single atom velocity perturbation. The lattice is modelled using the Sutton-Chen embedded atom model (EAM) without any energy loss mechanisms. We begin by showing that the concept of the cut-off distance must be abandoned to meaningfully simulate the transient...
Mr
Luke Ugwuoke
(Department of Physics, University of Pretoria)
11/07/2019, 10:20
Track G - Theoretical and Computational Physics
Oral Presentation
We present a discussion on the mode-mixing behaviour of dipolar and quadrupolar modes in gold nanoeggs. Nanoeggs are reduced-symmetry dielectric core-metallic shell nanostructures capable of supporting hybrid plasmonic modes. We investigated theoretically,
the localized surface plasmon resonances(LSPR) of nanoegg plasmons in both a non-confocal nanorice and a non-concentric nanoshell, using...
Prof.
Moritz Braun
(University of South Africa)
11/07/2019, 10:40
Track G - Theoretical and Computational Physics
Oral Presentation
Finite element calculations have been performed in Cartesian coordinates using the density functional approach
for a number of small molecules. In order to aid convergence
of the orbitals and total energies a suitable cusp factor was employed, such that the resulting effective potential is non-singular at all nuclei. The resulting total energies
and densities were compared with those...
Mr
Mpho Podile
(University of Johanensburg)
11/07/2019, 11:20
Track G - Theoretical and Computational Physics
Oral Presentation
The objectives of the research reported herein was to determine the composite wall of a crucible furnace for a contained heat and reduced heat loss to the ambient using Finite Element Method (FEM) considering transient heat conduction. This paper presents findings on heat transfer characteristics of a crucible furnace wall designed and constructed for the smelting of aluminium scraps in...
Mrs
OBIAGELI LOVENDA EZENWACHUKWU
(UNIVERSITY OF SOUTH AFRICA (UNISA))
11/07/2019, 11:40
Track G - Theoretical and Computational Physics
Oral Presentation
The Schroedinger equation in one and two dimensions is solved using sinc functions, applying the variational principle and employing Python and Numpy. Our goal is to examine how the sinc function method performs with respect to its convergence rate. The python codes are tested with the quantum harmonic oscillator potential and Morse potential, for which analytical solutions are...
Prof.
Kristian Müller-Nedebock
(University of Stellenbosch)
11/07/2019, 12:00
Track G - Theoretical and Computational Physics
