Galaxy redshift-space bispectrum: the Importance of Being Anisotropic
  We forecast the benefits induced by adding the bispectrum anisotropic signal
to the standard, two- and three-point, clustering statistics analysis. In
particular, we forecast cosmological parameter constraints including the
bispectrum higher multipoles terms together with the galaxy power spectrum
(monopole plus quadrupole) and isotropic bispectrum (monopole) data vectors. To
do so, an analytical covariance matrix model is presented. This template is
carefully calibrated on well-known terms of a numerical covariance matrix
estimated from a set of simulated galaxy catalogues. After testing the
calibration using the power spectrum and isotropic bispectrum measurements from
the same set of simulations, we extend the covariance modelling to the galaxy
bispectrum higher multipoles. Using this covariance matrix we proceed to
perform cosmological parameter inference using a suitably generated mock data
vector. Including the bispectrum mutipoles up to the hexadecapole, yields 1-D
$68\%$ credible regions for the set of parameters
$(b_1,b_2,f,\sigma_8,f_\mathrm{NL},\alpha_\perp, \alpha_\parallel)$ tighter by
a factor of 30$\%$ on average for $k_\mathrm{max}=0.09\,h$/Mpc, significantly
reducing at the same time the degeneracies present in the posterior
distribution.
