Geoff Beck
A5073816186- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Galaxies: Formation, Evolution, Phenomena
- Particle Detector Development and Performance
- Scientific Research and Discoveries
- Pulsars and Gravitational Waves Research
- Neutrino Physics Research
- Quantum Mechanics and Applications
- Computational Physics and Python Applications
- Gamma-ray bursts and supernovae
- Black Holes and Theoretical Physics
- Inorganic and Organometallic Chemistry
- Statistical Mechanics and Entropy
- Advanced Thermodynamics and Statistical Mechanics
- Astronomy and Astrophysical Research
- History and advancements in chemistry
- thermodynamics and calorimetric analyses
- Quantum Information and Cryptography
- Astrophysical Phenomena and Observations
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear physics research studies
University of the Witwatersrand
2013-2023
Rhodes University
2023
South African Radio Astronomy Observatory
2019-2023
Justus-Liebig-Universität Gießen
2016
Max Planck Institute for Radio Astronomy
2015
Max Planck Society
2015
University of KwaZulu-Natal
2013
University of Graz
1975
Balseiro Institute
1969
University of Bern
1947-1957
We provide an updated assessment of the power Cherenkov Telescope Array (CTA) to search for thermally produced dark matter at TeV scale, via associated gamma-ray signal from pair-annihilating particles in region around Galactic centre. find that CTA will open a new window discovery potential, significantly extending range robustly testable models given standard cuspy profile density distribution. Importantly, even cored profile, projected sensitivity be sufficient probe various...
Abstract The field of particle physics is at the crossroads. discovery a Higgs-like boson completed Standard Model (SM), but lacking observation convincing resonances Beyond SM (BSM) offers no guidance for future physics. On other hand, motivation New Physics has not diminished and is, in fact, reinforced by several striking anomalous results many experiments. Here we summarise status most significant anomalies, including recent flavour multi-lepton anomalies LHC, excess around 96 GeV,...
Abstract Approximately one hundred sources of very-high-energy (VHE) gamma rays are known in the Milky Way, detected with a combination targeted observations and surveys. A survey entire Galactic Plane energy range from few tens GeV to TeV has been proposed as Key Science Project for upcoming Cherenkov Telescope Array Observatory (CTAO). This article presents status studies towards Survey (GPS). We build make publicly available sky model that combines data recent gamma-ray emitters...
The following absolute rate constants of the reactions e aq ⊖ and OH with dimethylthioether dimethylsulfoxide have been determined: k (e + CH 3 SCH ) =2.0·10 7 mol -1 l sec ; k(e SOCH =1.7·10 6 k(OH+CH =5.2·10 9 =4.2·10 . acid basic components equilibrium are formed in OH+CH +CH , respectively. anion absorbs at 3500 Å. ρ K value was found to be equal 10.2. 2 radical (2900 Å) ions ⊕ or (CH (4700 also reaction between High thioether low concentrations favour formation positive ion which is...
The Fermi-LAT observation of a gamma-ray excess from the galactic-centre, as well PAMELA, AMS, and AMS-2 anti-particle excesses, recent claim in Reticulum-2 dwarf galaxy have been put forward signatures compatible with neutralino dark matter. These are particular interest annihilation models which fit these observations might observable consequences radio to emission. Since matter is expected be major constituent cosmic structure, multi-frequency should also common structures across mass...
Monochromatic gamma-ray signals constitute a potential smoking gun signature for annihilating or decaying dark matter particles that could relatively easily be distinguished from astrophysical instrumental backgrounds. We provide an updated assessment of the sensitivity Cherenkov Telescope Array (CTA) to such signals, based on observations Galactic centre region as well selected dwarf spheroidal galaxies. find current limits and detection prospects masses above 300 GeV will significantly...
Abstract Galaxy clusters are expected to be both dark matter (DM) reservoirs and storage rooms for the cosmic-ray protons (CRp) that accumulate along cluster's formation history. Accordingly, they excellent targets search signals of DM annihilation decay at γ -ray energies predicted sources large-scale emission due hadronic interactions in intracluster medium (ICM). In this paper, we estimate sensitivity Cherenkov Telescope Array (CTA) detect diffuse from Perseus galaxy cluster. We first...
The Galactic center $\ensuremath{\gamma}$-ray excess, detected by the Fermi-LAT, is a very attractive tentative signal from dark matter annihilation. Searching for associated synchrotron emissions can test interpretation this excess. We geared Five-hundred-meter Aperture Spherical Radio Telescope (FAST) toward Coma Berenices (a dwarf spheroidal galaxy) two hours of observation, and found no significant continuum radio emission, which could put constraints on annihilation cross section, our...
The Cherenkov Telescope Array (CTA), the new-generation ground-based observatory for γ astronomy, provides unique capabilities to address significant open questions in astrophysics, cosmology, and fundamental physics. We study some of salient areas cosmology that can be explored as part Key Science Projects CTA, through simulated observations active galactic nuclei (AGN) their relativistic jets. Observations AGN with CTA will enable a measurement absorption on extragalactic background light...
Radio synchrotron emission is expected as a natural by-product of the self-annihilation super-symmetric dark matter particles. In this work we discuss general properties radio in wide range halos, from local dwarf spheroidal galaxies to large and distant galaxy clusters with aim determine neutralino detection prospects Square Kilometre Array (SKA). The analysis SKA matter(DM)-induced presented for structures spanning masses redshifts, also analyze limits that can set on thermally averaged...
Dark Matter (DM) is a fundamental ingredient of our Universe and structure formation, yet its nature elusive to astrophysical probes.Information on the physical properties WIMP (neutralino) DM (the leading candidate for cosmologically relevant DM) can be obtained by studying signals their annihilation/decay.Among various e.m. signals, secondary electrons produced neutralino annihilation generate synchrotron emission in magnetized atmosphere galaxy clusters galaxies which could observed as...
Very-high Energy (VHE) gamma-ray astroparticle physics is a relatively young field, and observations over the past decade have surprisingly revealed almost two hundred VHE emitters which appear to act as cosmic particle accelerators. These sources are an important component of Universe, influencing evolution stars galaxies. At same time, they also probe in most extreme environments known - such supernova explosions, around or after merging black holes neutron stars. However, existing...