Searching for oscillations in the primordial power spectrum with CMB and LSS data

Chenxiao Zeng, Ely D. Kovetz, Xuelei Chen, Yan Gong, Julian B. Muñoz, Marc Kamionkowski

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Different inflationary models predict oscillatory features in the primordial power spectrum. These can leave an imprint on both the cosmic microwave background (CMB) and the large-scale structure (LSS) of our Universe that can be searched for with current data. Inspired by the axion-monodromy model of inflation, we search for primordial oscillations that are logarithmic in wave number, using both CMB data from the Planck satellite and LSS data from the WiggleZ galaxy survey. We find that, within our search range for the new oscillation parameters (amplitude, frequency and phase), both CMB-only and CMB+LSS data yield the same best-fit oscillation frequency of log10ω=1.5, improving the fit over ΛCDM by Δχ2=-9 and Δχ2=-13 (roughly corresponding to 2σ and 2.8σ significance), respectively. Bayesian evidence for the log-oscillation model versus ΛCDM indicates a very slight preference for the latter. Future CMB and LSS data will further probe this scenario.

Original languageEnglish
Article number043517
JournalPhysical Review D
Volume99
Issue number4
DOIs
StatePublished - 15 Feb 2019
Externally publishedYes

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