title: Beyond concordance cosmology with magnification of gravitational-wave standard sirens.
abstract: We show how future gravitational-wave detectors would be able to discriminate between the concordance Λ cold dark matter cosmological model and up-to-date competing alternatives, e.g., dynamical dark energy (DE) models or modified gravity (MG) theories. Our method consists of using the weak-lensing magnification effect that affects a standard-siren signal because of its traveling through the Universe's large scale structure. As a demonstration, we present constraints on DE and MG from proposed gravitational-wave detectors, namely Einstein Telescope and DECI-Hertz Interferometer Gravitational-Wave Observatory and Big-Bang Observer.
authors.affiliation: CENTRA, Instituto Superior Técnico, Universidade Técnica de Lisboa, Avenida Rovisco Pais 1, 1049-001 Lisboa, Portugal.
authors.forename: Stefano
authors.initials: S
authors.lastname: Camera
authors.affiliation: Yukawa Institute for Theoretical Physics, University of Kyoto, Kyoto 606-8502, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Nishizawa