Effects of Linear Redshift Space Distortions and Perturbation Theory on
  BAOs: A 3D Spherical Analysis
  The Baryon Acoustic Oscillations (BAO) are features in the matter power
spectrum on scales of order 100-150 h^{-1} Mpc that promise to be a powerful
tool to constrain and test cosmological models. The BAO have attracted such
attention that future upcoming surveys have been designed with the BAO at the
forefront of the primary science goals. Recent studies have advocated the use
of a spherical-Fourier Bessel (sFB) expansion for future wide field surveys
that cover both wide and deep regions of the sky necessitating the simultaneous
treatment of the spherical sky geometry as well as the extended radial
coverage. Ignoring the possible effects of growth, which is not expected to be
significant at low redshifts, we present an extended analysis of the BAOs using
the sFB formalism by taking into account the role of non-linearities and linear
redshift distortions in the oscillations observed in the galaxy power spectrum.
The sFB power spectrum has both radial and tangential dependence and it has
been shown that in the limit that we approach a deep survey the sFB power
spectrum is purely radial and collapses to the Cartesian Fourier power
spectrum. This radialisation of information is shown to hold even in the
presence of redshift space distortions (RSD) and 1-loop corrections to the
galaxy power spectrum albeit with modified tangential and radial dependence. As
per previous studies we find that the introduction of non-linearities leads to
a damping of the oscillations in the matter power spectrum.
