Multi-tracer power spectra and bispectra: Formalism

Understand

The power spectrum and bispectrum of dark matter tracers are key and complementary probes of the Universe.

• Next-generation surveys will deliver good measurements of the bispectrum, opening the door to improved cosmological constraints and the breaking of parameter degeneracies, from the combination of the power spectrum and bispectrum.
• Multi-tracer power spectra have been used to suppress cosmic variance and mitigate the effects of nuisance parameters and systematics.
• We present a bispectrum multi-tracer formalism that can be applied to next-generation survey data.