New early dark energy is compatible with current LSS data

Florian Niedermann, Martin S. Sloth

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Recently, a full-shape analysis of large-scale structure (LSS) data was employed to provide new constraints on a class of early dark energy models. In this paper, 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, baryonic acoustic oscillations, and supernovae data, we report H0=71.2±1.0 km s-1 Mpc-1 (68% C.L.) together with an approximate 4σ evidence for a nonvanishing fraction of NEDE. This is an insignificant change to the value previously found without full-shape LSS data, H0=71.4±1.0 km s-1 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.

TidsskriftPhysical Review D
Udgave nummer10
StatusUdgivet - 15. maj 2021

Bibliografisk note

Funding Information:
We thank Guido D’Amico for private correspondence, assistance in setting up the base run using p y b ird and comments on the draft. We also thank the SDU eScience Center for providing us with the computational resources for the MCMC analysis. This work is supported by Villum Fonden Grant No. 13384.


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