Assist. Prof. Dr. Tanja Petrushevska (UNG): Exploring the Universe with supernovae and strong lensing in the era of next-generation telescope surveys

In this seminar, we will embark on a journey to the most distant corners of the Universe thanks to the enormous power of the bright explosions of stars, called supernovae. To reach unprecedented distances, we use strong gravitational lensing that acts as a "gravitational telescope," magnifying the faint signals from distant supernovae and galaxies that would otherwise be undetectable. This lensing effect can also create multiple images of the background source with varying intensity patterns, delayed in time due to the different light paths. By making precise measurements of these "time delays" and analysing the intervening mass distribution, we can constrain cosmological parameters, such as the Hubble constant that informs us about the most important scales in the Universe: its size, age, expansion rate, and critical density.
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