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2025.10.28
A puzzle solved: the world is flat
I will report the solution to a puzzle of more than 40 years' standing: Why is the lower limit on the mass of the Local Group of galaxies inferred from the Timing Argument of Kahn & Woltjer (1959), larger than the upper limit implied by the almost unperturbed Hubble flow which Sandage (1986) measured for nearby galaxies.BIOProf. Simon D. M. White is the Emeritus Director at the Max-Planck-Insti...
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2025.10.27
57 Years of Pulsar Research
This talk outlines the personal story of my long career in pulsar research. It began shortly before publication of the first pulsar discovery by Antony Hewish, Jocelyn Bell, et al. In 1968, and is still continuing. I have been involved in many aspects of pulsar research over the years. This talk emphasizes my role in the development of new receiver systems for the Parkes 64m radio telescope in ...
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2025.10.27
Connecting protoplanetary disk observations with planet formation modeling
Structures such as gaps and rings in ALMA observations of protoplanetary disks have long been hailed as signposts of planet formation. However, it is still not clear how common such substructures are, when they become apparent in disks and how they are linked to the formation of planets. In this talk I will describe the latest insights on the commonality and evolution of substructures in disks,...
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2025.10.21
LOFAR Surveys: A New Window on the Universe
The Low-Frequency Array (LOFAR) is a pan-European radio telescope with immense data collection and processing capabilities, making it an unprecedented and powerful instrument for conducting the deepest and widest radio surveys at the lowest frequencies accessible from the ground. Over recent years, we have addressed key issues related to the analysis and calibration of radio data, allowing us t...
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2025.08.21
What drove the lunar dynamo?
Although the Moon today has no global magnetic field, paleomagnetic measurements of Apollo samples indicate the existence of an ancient field from at least 4.25 to 1.92 billion years ago. It has been proposed that the paleofield was generated by a core dynamo. However, the paleofield’s apparent high intensity and longevity are major challenges to current theory. Three key difficulties have bee...
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2024.12.12
Dark Matter under the Gravitational Lens [EN]
<p>Dark Matter (DM) is the clearest sign that the Standard Model of particle physics is incomplete. A determination of the DM particle mass will rule out entire classes of hypothetical extensions to the Standard Model, thus pointing the correct path towards New Physics. In this talk, I describe how gravitational lensing can differentiate between the two top contenders for DM: ultra-massive (WIMP...</p>
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2024.12.04
Imaging Giant Planet Formation [EN]
<p>The new generation of infrared high-contrast imagers and sub-mm interferometer has been revolutionising our view of planet formation for the last decade. Protoplanetary discs have now been imaged at a high level of detail, revealing a wealth of structures including cavities, annular gaps, spiral arms, shadows and asymmetries. In order to connect these structures to forming planets and provide t...</p>
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2024.11.14
Highlights of the MeerTime Key Science Project with MeerKAT [EN]
<p>Using a novel new teaching tool that uses a game engine to create an interactive astronomy universe Professor Matthew Bailes will talk about the highlights of the MeerTime program at MeerKAT. These include the discovery and timing of many new pulsars in globular clusters, giant pulse studies, many new pulsar masses, insights from the eclipses of the double pulsar and a tantalising Hellings and ...</p>
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2024.11.06
A chemical survey of exoplanet atmospheres with Ariel
<p>TBD</p>
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2024.09.12
Tensions on small scales: Too many galaxy-galaxy strong lenses in galaxy clusters?
<p>In the standard cosmological model, the matter content of the Universe is dominated by cold dark matter (CDM), collisionless particles that interact with ordinary matter (baryons) only through gravity. Gravitationally bound dark-matter halos form hierarchically, with the most massive systems growing through mergers of smaller ones. As structure assembles in this fashion, large dark-matter halos...</p>
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