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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!


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 H0=71.4±1.0kms1Mpc1 (68% C.L.).

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  • Received 14 November 2019

  • Revised 4 July 2020

  • Accepted 22 January 2021


© 2021 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas

Cosmic microwave backgroundDark energyEvolution of the Universe

Gravitation, Cosmology & Astrophysics


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


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2 朱林 宁利中

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