Cosmological Measurements from Angular Power Spectra Analysis of BOSS
  DR12 Tomography
  We constrain cosmological parameters by analysing the angular power spectra
of the Baryon Oscillation Spectroscopic Survey DR12 galaxies, a spectroscopic
follow-up of around 1.3 million SDSS galaxies over 9,376 deg$^2$ with an
effective volume of $\sim 6.5$ (Gpc $h^{-1}$)$^3$ in the redshift range $0.15
\leq z < 0.80$. We split this sample into 13 tomographic bins ($\Delta z =
0.05$); angular power spectra were calculated using a Pseudo-$C_{\ell}$
estimator, and covariance matrices were estimated using log-normal simulated
maps. Cosmological constraints obtained from these data were combined with
constraints from Planck CMB experiment as well as the JLA supernovae
compilation. Considering a $w$CDM cosmological model measured on scales up to
$k_{max} = 0.07h$ Mpc$^{-1}$, we constrain a constant dark energy
equation-of-state with a $\sim 4\%$ error at the 1-$\sigma$ level: $w_0 =
-0.993^{+0.046}_{-0.043}$, together with $\Omega_m = 0.330\pm 0.012$, $\Omega_b
= 0.0505 \pm 0.002$, $S_8 \equiv \sigma_8 \sqrt{\Omega_m/0.3} = 0.863 \pm
0.016$, and $h = 0.661 \pm 0.012$. For the same combination of datasets, but
now considering a $\Lambda$CDM model with massive neutrinos and the same scale
cut, we find: $\Omega_m = 0.328 \pm 0.009$, $\Omega_b =
0.05017^{+0.0009}_{-0.0008}$, $S_8 = 0.862 \pm 0.017$, and $h =
0.663^{+0.006}_{-0.007}$ and a 95\% credible interval (CI) upper limit of $\sum
m_{\nu} < 0.14$ eV for a normal hierarchy. These results are competitive if not
better than standard analyses with the same dataset, and demonstrate this
should be a method of choice for future surveys, opening the door for their
full exploitation in cross-correlations probes.
