Title: Recent developments with the Hubble tension and with chiral cosmology Abstract: In this talk, I will split my time between two subjects that have interested me (and others recently): The first is the Hubble tension. I will review the discrepancy between CMB and local measurements of the cosmic expansion rate and then describe some theoretical efforts to explain it. I will then discuss recent work focussed on the idea of the search for parity-breaking effects in cosmological observables. Speaker: Professor Marc Kamionkowski, The William R. Kenan, Jr. Professor of Physics and Astronomy at Johns Hopkins University, USA Date and Time: 10 th August 2020, 3 PM to 5.30 PM Berlin time (which will be 6:30 PM to 9:00 PM Indian time) Zoominar link: https://mpi-aei.zoom.us/j/97623339163 Contact: Dr. Sayantan Choudhury ([email protected])