Testing Oscillating Primordial Spectrum and Oscillating Dark Energy with Astronomical Observations
Jie Liu, Hong Li, Junqing Xia, Xinmin Zhang

TL;DR
This study uses current astronomical data to constrain oscillating features in the primordial scalar spectrum and dark energy's equation of state, finding they are still compatible with observations and could be better tested with future data.
Contribution
The paper provides the first comprehensive analysis constraining oscillating primordial spectra and dark energy oscillations using combined observational data.
Findings
Oscillating primordial spectrum amplitude constrained to |n_amp|<0.116
Oscillating dark energy equation of state constrained to |w_amp|<0.232
Oscillatory features remain compatible with current observations
Abstract
In this paper we revisit the issue of determining the oscillating primordial scalar power spectrum and oscillating equation of state of dark energy from the astronomical observations. By performing a global analysis with the Markov Chain Monte Carlo method, we find that the current observations from five-year WMAP and SDSS-LRG matter power spectrum, as well as the "union" supernovae sample, constrain the oscillating index of primordial spectrum and oscillating equation of state of dark energy with the amplitude less than and at 95% confidence level, respectively. This result shows that the oscillatory structures on the primordial scalar spectrum and the equation of state of dark energy are still allowed by the current data. Furthermore, we point out that these kinds of modulation effects will be detectable (or gotten a stronger constraint) in…
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