Inflation in de Sitter spacetime and CMB large scales anomaly
  The influence of cosmological constant type dark energy in the early universe
is investigated. This is accommodated by a new dispersion relation in de Sitter
spacetime. We perform a global fitting to explore the cosmological parameters
space by using the CosmoMC package with the recently released Planck TT and
WMAP Polarization datasets. Using the results from global fitting, we compute a
new CMB temperature-temperature spectrum. The obtained TT spectrum has lower
power compared with the one based on $\Lambda$CDM model at large scales.
