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2025.12.16
Magnetohydrodynamic Seismology of the Corona of the Sun
Processes operating in the outer layers of the Sun’s atmosphere, the fully ionised, magnetically dominated plasma of the corona, remain one of the major unsolved puzzles in solar physics. Intensively debated research topics include the enigmatic problem of coronal heating; the rapid release of enormous amounts of magnetic energy in solar flares and coronal mass ejections; the microphysical mec...
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2025.12.15
Plowing for physics with black holes
Black holes have become unique tools in the understanding of a plethora of phenomena in vastly different fronts. From understanding spectacularly energetic events in our universe, from gaining insights on potential new particles to unraveling seemingly unrelated phenomena through a firm grasp of their dynamics is key. In this talk, we will connect with several of these fronts highlighting some ...
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2025.11.26
Free Floating Planets and stellar binary formation
Planet formation is far from understood. Observations of Free Floating Planets (FFPs), on the one hand, and of planets in tight stellar binaries, on the other, are challenging our leading (Core Accretion) scenario for planet formation strongly. This classical framework requires a prolonged epoch of gentle accumulation of small solids into ever larger bodies, yet both FFPs and planets in binarie...
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2025.11.25
SQ-A: A Collision Triggered Starburst in Intra-Group Medium of Stephan's Quintet
SQ-A is a starburst in the intra-group medium (IGrM) of the famous compact group Stephan's Quintet (SQ). There has been a long controversy on whether SQ-A is triggered by a collision of two gas systems, one is associated with the IGrM (v~6900 km/s) and another with the intruder galaxy NGC 7318b (v~6000 km/s). The counter argument against the collisional scenario is based on the fact that in a l...
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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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