Reducing cosmological degeneracies by combining multiple classes of LISA gravitational-wave standard sirens
Abstract
We present the first joint gravitational-wave cosmological inference with LISA extreme mass-ratio inspirals at z1 (galaxy redshifts) and massive black hole binaries at z1 (electromagnetic counterparts). Combining these standard sirens reduces cosmological degeneracies and yields competitive constraints on the Hubble constant H0 and the dark-energy equation-of-state parameter w0. This highlights LISA's potential for late-time cosmology across a broad redshift range with systematics distinct from electromagnetic distance indicators.
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