Topic: LISA

Pratika Dayal examines galaxy and black-hole formation during the first billion years, when the first galaxies ended the cosmic dark ages and began reionizing intergalactic hydrogen. JWST has revealed unexpectedly abundant, massive black holes, reaching about one hundred million solar masses within the first six hundred million years, challenging formation models. These observations can constrain the progress and spatial structure of reionization in preparation for 21-centimeter measurements. Early galaxies also test alternatives to cold dark matter. The talk considers the gravitational-wave e

Cole, Cormac and new host Sanika discuss gravitational-wave astrophysics: neutron-star and black-hole mergers, LIGO and Virgo observations, and future detectors including LISA. The conversation introduces both the scientific signals and the research questions driving the field.