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Prof. Tibra Ali24/04/2023, 09:05
In this lecture I shall introduce some basic notions needed for quantum information theory including qubits, density matrices, entanglement, quantum logic gates, basic quantum algorithms. The lecture will assume familiarity with basic quantum mechanics.
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Prof. Tibra Ali24/04/2023, 11:00
In this lecture I shall introduce some basic applications of quantum information ideas such as quantum key distributions (QKD), Bell's theorem, and NMR as basic quantum processors.
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Prof. Jeff Murugan (University of Cape Town)24/04/2023, 14:00
Abstract
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Jaco Van Zyl24/04/2023, 14:45
The notion of computational complexity has recently attracted attention in several fields, in part due to its conjectured holographic connection to the volume of black hole interiors. In the context of classical or quantum computers it arises as a natural quantity that counts the smallest number of gates needed to produce a desired output state from a circuit. With this analogy it can be...
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Prof. Christo Venter (NWU)24/04/2023, 16:00
The last few years have seen the birth of in multi-messenger astronomy. Two prominent publications initiated the field: the first described the concurrent discovery of gravitational waves (GW170817) and a gamma-ray burst (GRB 170817A) linked to the binary neutron star merger event; the second claimed the association of the blazar TXS 0506+056 as the source of extremely-high-energy neutrinos...
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Aroonkumar Beesham24/04/2023, 16:45
The observation of distant supernovae moving at speeds greater than that expected has changed our perception of cosmology. It now appears that the current universe is accelerating as opposed to decelerating as thought of previously. To try to explain this acceleration is one of the most important issues in cosmology. A new kind of matter, dubbed dark energy, with negative pressure has been...
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Dr Stefano Gariazzo (INFN Turin)25/04/2023, 09:00
We review neutrino oscillations from the theoretical and experimental points of view, by analysing how neutrino oscillations have been proposed, how we measured them and what is the current status.
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Some comments on the absolute neutrino mass scale and mass ordering are also proposed.
We discuss mostly the standard three-neutrino case, and shortly introduce the case of light sterile neutrinos. -
Dr Stefano Gariazzo (INFN Turin)25/04/2023, 11:00
After a short introduction on cosmology, we discuss how neutrinos affect the expansion of the universse in different epochs, by analysing their impact on early- and late-time observables and how we can use cosmological measurements to constrain neutrino properties.
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Neutrino decoupling, Big Bang nucleosynthesis, Cosmic Microwave Background and related constraints are presented. -
Alexei Smirnov25/04/2023, 14:00
A possibility is considered that the observed neutrino oscillations are due to refraction effects on a very light scalar dark matter. Properties of the effective neutrino mass-squared responsible for the oscillation effects are studied. In particular, the dependence of the effective mass on state of medium: a cold gas of particles or a classical scalar field is explored. Cosmological...
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Khushboo Dixit25/04/2023, 14:45
The phenomena of entanglement and the nonlocal features of quantum correlations were initially introduced to elegantly abase the opponents of quantum mechanics. However, owing to the development of quantum information science, these quantum mechanical features have to be reassessed and to be elevated as resources that may be exploited to achieve tasks that are not possible within the realm of...
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Dr Peter Denton (Brookhaven National Laboratory)25/04/2023, 16:00
Terrestrial and solar neutrino experiments have a variety of anomalous data that has resisted clarification. Recently, it has appeared that measurements of neutrinos from intense sources on gallium have passed 5σ and other hints from MicroBooNE and elsewhere remain interesting. I will present the latest update of these anomalies. I will then explain the primary reasons why these cannot be...
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Mr Thabo Msiza (University of Johannesburg)25/04/2023, 16:45
The Standard Model is widely accepted as one of the most successful predictive theories of Physics, providing insight into the fundamental building blocks of the universe. Over the last few decades this model has shown signs of incompleteness, most of which are attributed to Neutrinos. Within the confines of the standard model a discrepancy exists related to vanishing Neutrino masses, which...
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Tamador Aldowma (Johannesburg University, Omdurman Islamic University)25/04/2023, 17:00
Gamma-Ray Bursts (GRBs) have been detected to very high redshift (z = 9.4) which make them interesting cosmological probes. In attempts to use GRBs as cosmological standard candles, like Type-Ia supernovae (SNe), many studies have been conducted throughout in recent decades. These studies explore different phenomenological relations, such as the Amati and Yonetoku correlations between the GRB...
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Mr Luyanda Mazwi (University of Johannesburg)25/04/2023, 17:15
The detection of Gravitational Waves (GWs) allows the study of massive binary systems that may or may not have any electromagnetic (EM) emission. The joint detection of GW~170817 and the Gamma Ray Burst (GRB) GRB~170817A, marked the beginning of GW multi-messenger astronomy. It presented the potential to reveal new insights into the emission mechanisms of GRBs as well as a more accurate...
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Alvaro de la Cruz-Dombriz (University of Cape Town)26/04/2023, 09:00
These two pedagogical lectures are aimed to bring attendees up to date with the basic concepts and key results in current theoretical and observational cosmology. The focus is on building physical understanding and making links to modern observations where possible.
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The lectures shall begin with an overview of the accelerating universe model (LCDM), from the Big Bang and Inflation to the... -
Alvaro de la Cruz-Dombriz (University of Cape Town)26/04/2023, 09:50
These two pedagogical lectures are aimed to bring attendees up to date with the basic concepts and key results in current theoretical and observational cosmology. The focus is on building physical understanding and making links to modern observations where possible.
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The lectures shall begin with an overview of the accelerating universe model (LCDM), from the Big Bang and Inflation to the... -
Prof. Amare Abebe (North-West University)26/04/2023, 11:00
In this lecture, I will briefly overview the standard cosmological model and highlight some of its outstanding problems. I will then suggest potential candidates to alleviate the problems, and ways to observationally constrain them using astrophysical data.
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Surajit Kalita (University of Cape Town)26/04/2023, 14:00
Over the past decades, various researchers have indirectly predicted over a dozen super-Chandrasekhar white dwarfs (white dwarfs which violate the Chandrasekhar mass-limit) from the luminosity observations of peculiar over-luminous type Ia supernovae. Similarly recent gravitational wave observations showed the possibility of existence of massive neutron stars. In my presentation, I will...
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Mr Brandon Bisschoff (University of KwaZulu-Natal)26/04/2023, 14:45
Studies on the rest frame 21 cm spectral emission line of neutral hydrogen (HI; from the hyperfine spin-flip state transition) provides an interesting and novel way of studying the large-scale structure (LLS), baryon acoustic oscillations (BAO), cosmological models and galaxy dynamics and evolution. By modelling the distribution function of HI within dark matter halos and, consequently, the...
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Mthokozisi Mdlalose (University of KwaZulu-Natal)26/04/2023, 15:00
In this work, we will present the preliminary work on statistical detection of kSZ effect using Aperture Photometry. We use DESI cluster galaxy catalogue that follows in Boss-North and D56 ACTPOL region to measure kSZ effect.
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Binaya Kumar Bishi (University of Zululand)26/04/2023, 15:15
In this short presentation, I will discuss about the research work regarding f(R,T) gravity and solutions under various functional form of f(R,T) for Godel universe.
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Dr Hoang Nguyen (Babes-Bolyai University)26/04/2023, 16:00
In this talk, I shall present a novel class of non-Schwarzschild asymptotically flat metrics in exact closed analytical form for pure $R^2$ gravity (Phys. Rev. D 106 (2022) 10, 104004). They were recently derived from a program originated by Buchdahl in 1962. I shall also discuss the existence of Morris-Thorne-Buchdahl wormholes using the metrics.
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Mfanafuthi Msweli (University of Zululand)26/04/2023, 16:15
Most of the matter in the universe is thought to be a form of dark energy, which makes up about 70% of all matter in the universe, 25% of dark matter, and 5% of ordinary matter such as planets and stars. Since it was discovered around 1998, researchers have been trying to determine the nature of this dark energy. Despite many efforts, there is still no good explanation for this. Two possible...
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Shambel Sahlu (Entoto Observatory and Reserach Center, Ethiopian Space Science and Technology Institute)26/04/2023, 16:30
In this presentation is mainly devoted to the extended theory of Einstein’s gravity, particularly focused on the modified teleparallel gravity theory to explore different cosmological interests beyond the standard model of cosmology. The accelerating expansion of the universe, the linear cosmological perturbations and the inflationary Universe in modified teleparallel gravity theory will be...
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Nitin Gupta (University of Cape Town)26/04/2023, 16:45
Quantum Complexity has emerged in the past few years as a candidate for quantum chaos diagnostic. This talk is based on a work that appeared last year, in which we show that a notion of quantum complexity (spread complexity) is sensitive to Topological Phase Transitions - at least for the prototypical Kitaev chain. I'll give a brief overview of what we mean when we say "quantum" chaos and...
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Shambel Sahlu (Entoto Observatory and Reserach Center, Ethiopian Space Science and Technology Institute)
The cosmological scalar perturbations of standard matter are investigated in the context of extended teleparallel $f(T)$ gravity theories using the $1+3$ covariant formalism. After a review of the background gravitational field equations of $f(T)$ gravity and the introduction of the covariant perturbation variables, the usual scalar and harmonic decomposition have been performed, and the...
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