  The advent of high signal-to-noise cosmic microwave background (CMB)
anisotropy experiments now allow detailed studies on the statistics related to
temperature fluctuations. The existence of acoustic oscillations in the
anisotropy power spectrum is now established with the clear detection of the
first, and to a lesser confidence the second and the third, peak. Beyond the
acoustic peak structure associated with CMB photon temperature fluctuations, we
study the possibility for an observational detection of oscillations in the
large scale structure (LSS) matter power spectrum due to baryons. We also
suggest a new cosmological test using the angular power spectrum of dark matter
halos, or clusters of galaxies detected via wide-field surveys of the large
scale structure. The standard rulers of the proposed test involve overall shape
of the matter power spectrum and baryon oscillation peaks in projection. The
test allows a measurement of the angular diameter distance as a function of
redshift, similar to the distance to the last scattering surface from the first
acoustic peak in the temperature anisotropy power spectrum. The simultaneous
detection of oscillations in both photons and baryons will provide a strong,
and a necessary, confirmation of our understanding related to the physics
during the recombination era. The proposed studies can be carried out with a
combined analysis of CMB data from missions such as the MAP and the large scale
structure data from missions such as the DUET.
