Title: Puzzles of Galaxy Evolution Abstract: I will describe a pair of sharp puzzles suggesting a possible mismatch between our theory of galaxy evolution and recent observations.  First, current models predict that the z ~ 4-8 universe should be a time in which the most massive galaxies are transitioning from their initial halo assembly to … Continue reading "Prof. Charles Louis Steinhardt (Niels Bohr Institute)"

============== Multi-messenger signals from gravitational wave sources Neutron star mergers had long been suspected to produce gravitational wave "chirps", gamma ray bursts and produce r-process elements. While overall convincing, all these conjectures were based on indirect arguments and none was proven directly. This changed on August 17, 2017: a gravitational wave signal from a merging … Continue reading "Prof. Stephan Rosswog (Stockholm University)"