The Future of Primordial Features with Large-Scale Structure Surveys
  Primordial features are one of the most important extensions of the Standard
Model of cosmology, providing a wealth of information on the primordial
universe, ranging from discrimination between inflation and alternative
scenarios, new particle detection, to fine structures in the inflationary
potential. We study the prospects of future large-scale structure (LSS) surveys
on the detection and constraints of these features. We classify primordial
feature models into several classes, and for each class we present a simple
template of power spectrum that encodes the essential physics. We study how
well the most ambitious LSS surveys proposed to date, including both
spectroscopic and photometric surveys, will be able to improve the constraints
with respect to the current Planck data. We find that these LSS surveys will
significantly improve the experimental sensitivity on features signals that are
oscillatory in scales, due to the 3D information. For a broad range of models,
these surveys will be able to reduce the errors of the amplitudes of the
features by a factor of 5 or more, including several interesting candidates
identified in the recent Planck data. Therefore, LSS surveys offer an
impressive opportunity for primordial feature discovery in the next decade or
two. We also compare the advantages of both types of surveys.
