Topics: LISA collaboration, Standard Sirens, Gravitational lensing, Modified gravity, Early Universe, Phase transitions, Cosmic strings, Cosmic Inflation, Primordial Black HolesDate: 13. April 2022Online abstract: arXiv:2204.05434Members involved: Chiara Caprini, Giulia Cusin, Charles Dalang, Valerio De Luca, Gabriele Franciolini, Lucas Lombriser, Michele Maggiore, Michele Mancarella, Antonio Riotto, Camille Bonvin, Ruth Durrer, Martin KunzSummary: Give a non-specialist summary of your paper.