Using the Fisher-matrix formalism, we derive an equation that generalizes previous results by considering binning in the orientation of wavevector triangles with respect to the line of sight, to investigate whether the galaxy bispectrum in redshift space contains additional cosmological information with respect to the power spectrum.

Monthly Notices of the Royal Astronomical Society

We use the Fisher-matrix formalism to investigate whether the galaxy bispectrum in redshift space, B, contains additional cosmological information with respect to the power spectrum, P. We focus on a Euclid-like survey and consider cosmological models dominated by dark energy and cold dark matter with Gaussian primordial perturbations. After discussing the phenomenology of redshift-space distortions for the bispectrum, we derive an expression for the cross-covariance between B and P at leading order in perturbation theory. Our equation generalizes previous results that did not consider binning in the orientation of wavevector triangles with respect to the line of sight. By considering Fourier modes with wavenumber

Cosmological information in the redshift-space bispectrum