Uniting the Three Kingdoms of Cosmic Dawn

Does JWST's discovery of luminous star-forming galaxies, 'Little Red Dot’ AGNs, and massive quiescent galaxies in the early universe require rewriting galaxy formation or cosmology?


The first three scientific years of JWST operation has revealed a host of problems in our scientific understanding of the early Universe. First we have the discovery of over-luminous and over-abundant star forming galaxies at z>10, second we have the enigmatic population of over-abundant ‘Little Red Dots’ that burst in to the universe at z>4 and seem to represent a new mechanism of growth for early supermassive black holes. Finally we have the population of early massive quiescent galaxies whose formation seems to ‘break the universe’. These galaxy populations are all greatly in excess abundance compared to the pre-JWST predictions, and Little Red Dots were not predicted at all. No doubt all three problems are connected and may yield a single - and potentially revolutionary - solution if nature were to co-operate. A period of scientific chaos may give rise to a new unity. I will review the latest observations and model predictions for these topics and also point the way to the future beyond JWST where new wide-area space missions are very much needed to make ground-breaking contributions.


Speaker: 
Karl Glazebrook (Swinburne University of Technology)
Place: 
KIAA-auditorium
Host: 
Linhua Jiang
Time: 
Thursday, January 15, 2026 - 3:30PM to Thursday, January 15, 2026 - 4:30PM
Biography: 
Prof. Karl Glazebrook FAA FASA is a Distinguished Professor at the Swinburne University of Technology and an elected Fellow of the Australian Academy of Science. He is a world-leading astronomer whose research has led to major advances in our understanding of how galaxies and the Universe evolve over time. His ground-breaking work includes, establishing the existence of massive galaxies only three billion years after the Big Bang, and discovering the local analogues of primordial galaxies. Glazebrook has also pioneered near-infrared surveys and developed new award-winning instrumental techniques for carrying out ultra-deep spectroscopic surveys on the world’s largest telescopes. He has also been at the vanguard in the application of new observational techniques for quantifying the effects of dark energy on the accelerating expansion of the Universe. He is the founder of the JWST Australian Data Centre.