New Early Dark Energy is compatible with current LSS data

Abstract

Recently a full-shape analysis of large-scale structure (LSS) data was employed to provide new constraints on a class of Early Dark Energy (EDE) models. In this note, we derive similar constraints on New Early Dark Energy (NEDE) using the publicly available PyBird code, which makes use of the effective field theory of LSS. We study the NEDE base model with the fraction of NEDE and the trigger field mass as two additional parameters allowed to vary freely while making simplifying assumptions about the decaying fluid sector. Including the full-shape analysis of LSS together with measurements of the cosmic microwave background (CMB), baryonic acoustic oscillations (BAO) and supernovae (SN) data, we report $H_0=71.2\pm 1.0\text{km}{\text{s}}^{-1}{\text{Mpc}}^{-1}$ ($68\%$ C.L.) together with a $\simeq 4\sigma$ evidence for a non-vanishing fraction of NEDE. This is an insignificant change to the value previously found without full-shape LSS data, $H_0=71.4\pm 1.0\text{km}{\text{s}}^{-1}{\text{Mpc}}^{-1}$ ($68\%$ C.L.). As a result, while the NEDE fit cannot be improved upon the inclusion of additional LSS data, it is also not adversely affected by it, making it compatible with current constraints from LSS data. In fact, we find evidence that the effective field theory of LSS acts in favor of NEDE.

15 pages, 4 figures, v2: added detailed discussion on linear and EFT-corrected power spectrum, added references, improvements to manuscript

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