The BOSS DR12 Full-Shape Cosmology: $\Lambda$CDM Constraints from the
  Large-Scale Galaxy Power Spectrum and Bispectrum Monopole
  We present a full $\Lambda$CDM analysis of the BOSS DR12 dataset, including
information from the power spectrum multipoles, the real-space power spectrum,
the reconstructed power spectrum and the bispectrum monopole. This is the first
analysis to feature a complete treatment of the galaxy bispectrum, including a
consistent theoretical model and without large-scale cuts. Unlike previous
works, the statistics are measured using window-free estimators: this greatly
reduces computational costs by removing the need to window-convolve the theory
model. Our pipeline is tested using a suite of high-resolution mocks and shown
to be robust and precise, with systematic errors far below the statistical
thresholds. Inclusion of the bispectrum yields consistent parameter constraints
and shrinks the $\sigma_8$ posterior by $13\%$ to reach $<5\%$ precision; less
conservative analysis choices would reduce the error-bars further. Our
constraints are broadly consistent with Planck: in particular, we find $H_0 =
69.6^{+1.1}_{-1.3}\,\mathrm{km}\,\mathrm{s}^{-1}\mathrm{Mpc}^{-1}$, $\sigma_8 =
0.692^{+0.035}_{-0.041}$ and $n_s=0.870^{+0.067}_{-0.064}$, including a BBN
prior on the baryon density. When $n_s$ is set by Planck, we find $H_0 =
68.31^{+0.83}_{-0.86}\,\mathrm{km}\,\mathrm{s}^{-1}\mathrm{Mpc}^{-1}$ and
$\sigma_8 = 0.722^{+0.032}_{-0.036}$. Our $S_8$ posterior, $0.751\pm0.039$, is
consistent with weak lensing studies, but lower than Planck. Constraints on the
higher-order bias parameters are significantly strengthened from the inclusion
of the bispectrum, and we find no evidence for deviation from the dark matter
halo bias relations. These results represent the most complete full-shape
analysis of BOSS DR12 to-date, and the corresponding spectra will enable a
variety of beyond-$\Lambda$CDM analyses, probing phenomena such as the neutrino
mass and primordial non-Gaussianity.
