Primordial feature constraints from BOSS + eBOSS

Thiago Mergulhão, Florian Beutler, John A. Peacock

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Understanding the universe in its pristine epoch is crucial in order to obtain a concise comprehension of the late-time universe. Although current data in cosmology are compatible with Gaussian primordial perturbations whose power spectrum follows a nearly scale-invariant power law, this need not be the case when a fundamental theoretical construction is assumed. These extended models lead to sharp features in the primordial power spectrum, breaking its scale invariance. In this work, we obtain combined constraints on four primordial feature models by using the final data release of the BOSS galaxies and eBOSS quasars. By pushing towards the fundamental mode of these surveys and using the larger eBOSS volume, we were able to extend the feature parameter space (i.e. the feature frequency ω) by a factor of four compared to previous analyses using BOSS. While we did not detect any significant features, previous work showed that next-generation galaxy surveys such as DESI will improve the sensitivity to features by a factor of 7, and will also extend the parameter space by a factor of 2.5.

Original languageEnglish
Article number012
Pages (from-to)1-38
Number of pages38
JournalJournal of Cosmology and Astroparticle Physics
Issue number8
Publication statusPublished - 10 Aug 2023

Keywords / Materials (for Non-textual outputs)

  • cosmic web
  • cosmological parameters from LSS
  • physics of the early universe
  • redshift surveys


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