Exploring Inflationary Initial State With Large Scale Structure
  Observations
  We investigate for possible constraints on inflationary initial state from
Large Scale Structure (LSS) observations. Using a model-independent framework,
we build the template for the generic initial state and construct the matter
power spectrum through time evolution of the primordial power spectrum. We then
make use of the LSS data separately from the Sloan Digital Sky Survey - Data
Release 7 (SDSS-DR7) sample of Luminous Red Galaxies (LRG) and WiggleZ Dark
Energy Survey, and explore the plausible constraints on initial vacuum by
applying Bayesian parameter estimation method with Markov Chain Monte Carlo
(MCMC) simulation. Our analysis reveals that, along with the usual Bunch-Davies
vacuum, non-Bunch-Davies initial states are also fairly allowed so far as
present LSS data is concerned.
