最近又有研究者为解决Riess团队用SNe法得出的74 km·s⁻¹·Mpc⁻¹和普朗克卫星团队用CMB方法得出的67.8km·s⁻¹·Mpc⁻¹这两个广为关注的测量值的矛盾，提出New early dark energy模型，拟合到宇宙微波背景(CMB)、重子声振荡(BAO)和超新星(SNe)的测量中，得出H₀=71.4±1.0  km·s⁻¹·Mpc⁻¹。这一研究结果与我们的理论值H₀=70.937  km·s⁻¹·Mpc⁻¹如此之贴近，令人鼓舞！

谢谢刘进平教授及时传达这一信息，现转载如下：

New measurements of the expansion rate of the Universe have plunged the standard model of cosmology into a severe crisis. In this paper, we propose a simple resolution to the problem that relies on a first order phase transition in a dark sector in the early Universe, before recombination. This will lead to a short phase of a new early dark energy (NEDE) component and can explain the observations. We model the false vacuum decay of the NEDE scalar field as a sudden transition from a cosmological constant source to a decaying fluid with constant equation of state. The corresponding fluid perturbations are covariantly matched to the adiabatic fluctuations of a subdominant scalar field that triggers the phase transition. Fitting our model to measurements of the cosmic microwave background (CMB), baryonic acoustic oscillations (BAO, and supernovae (SNe) yields a significant improvement of the best fit compared with the standard cosmological model without NEDE. We find the mean value of the present Hubble parameter in the NEDE model to be $H_0=71.4\pm 1.0\mathrm{km}{s}^{-1}{\mathrm{Mpc}}^{-1}$ (68% C.L.).

• Received 14 November 2019

• Revised 4 July 2020

• Accepted 22 January 2021

DOI:https://doi.org/10.1103/PhysRevD.103.L041303

Physics Subject Headings (PhySH)

1. Research Areas

Cosmic microwave backgroundDark energyEvolution of the Universe

Gravitation, Cosmology & Astrophysics

AUTHORS & AFFILIATIONS

Florian Niedermann* and Martin S. Sloth†

• CP3-Origins, Center for Cosmology and Particle Physics Phenomenology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark

• *niedermann@cp3.sdu.dk

• †sloth@cp3.sdu.dk