On the Detection of CMB B-modes from Ground at Low Frequency
  The primordial CMB $B$-mode search is on the spotlight of the scientific
community due to the large amount of cosmological information that is encoded
in the primeval signal. However, the detection of this signal is challenging
from the data analysis point of view, due to the relative low amplitude
compared to the foregrounds, the lensing contamination coming from the leakage
of $E$-modes, and the instrumental noise. Here, we studied the viability of the
detection of the primordial polarization $B$-mode with a ground-based telescope
operating in the microwave low-frequency regime (i.e., from 10GHz-120GHz) in a
handful of different scenarios: i. the instrument's channels distribution and
noise, ii. the tensor-to-scalar ratio ($r$) detectability considering different
possible $r$ values and degrees of delensing, iii. the effect of including a
possible source of polarized anomalous microwave emission (AME), iv. the
strengths and weaknesses of different observational strategies and, v. the
atmospheric and systematic noise impact on the recovery. We focused mainly on
the removal of galactic foregrounds as well as noise contamination by applying
a full-parametric pixel-based maximum likelihood component separation
technique. Moreover, we developed a numerical methodology to estimate the
residuals power spectrum left after component separation, which allow us to
mitigate possible biases introduced in the primordial $B$-mode power spectrum
reconstruction. Among many other results, we found that this sort of experiment
is capable of detecting Starobinsky's $r$ even when no delensing is performed
or, a possible polarized AME contribution is taken into account. Besides, we
showed that this experiment is a powerful complement to other on-ground or
satellite missions, such as LiteBIRD, since it can help significantly with the
low-frequency foregrounds characterization.
