Large scale distribution of mass versus light from Baryon Acoustic
  Oscillations: Measurement in the final SDSS-III BOSS Data Release 12
  Baryon Acoustic Oscillations (BAOs) in the early Universe are predicted to
leave an as yet undetected signature on the relative clustering of total mass
versus luminous matter. This signature, a modulation of the relative
large-scale clustering of baryons and dark matter, offers a new angle to
compare the large scale distribution of light versus mass. A detection of this
effect would provide an important confirmation of the standard cosmological
paradigm and constrain alternatives to dark matter as well as non-standard
fluctuations such as Compensated Isocurvature Perturbations (CIPs). The first
attempt to measure this effect in the SDSS-III BOSS Data Release 10 CMASS
sample remained inconclusive but allowed to develop a method, which we detail
here and use to conduct the second observational search. When using the same
model as in our previous study and including CIPs in the model, the DR12 data
are consistent with a null-detection, a result in tension with the strong
evidence previously measured with the DR10 data. This tension remains when we
use a more realistic model taking into account our knowledge of the survey flux
limit, as the data then privilege a zero effect. In the absence of CIPs, we
obtain a null detection consistent with both the absence of the effect and the
amplitude predicted in previous theoretical studies. This shows the necessity
of more accurate data in order to prove or disprove the theoretical
predictions.
