Inflation in de Sitter spacetime and CMB large scales anomaly

TL;DR

This paper investigates how dark energy modeled as a cosmological constant affects early universe inflation and large-scale CMB anomalies, introducing a new dispersion relation in de Sitter spacetime and fitting it to observational data.

Contribution

It proposes a new dispersion relation in de Sitter spacetime to incorporate dark energy effects during inflation and fits this model to Planck and WMAP data to explain large-scale CMB anomalies.

Findings

Lower power in the CMB TT spectrum at large scales compared to ΛCDM.

The new model provides a better fit to observed large-scale CMB anomalies.

Potential implications for understanding dark energy's role in early universe inflation.

Abstract

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.