Gravitational Particle Production and the Hubble Tension

IF 2.5 4区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Universe Pub Date : 2024-08-23 DOI:10.3390/universe10090338

Recai Erdem

引用次数: 0

Abstract

The effect of gravitational particle production of scalar particles on the total effective cosmic energy density (in the era after photon decoupling till the present) is considered. The effect is significant for heavy particles. It is found that gravitational particle production results in an effective increase in the directly measured value of the Hubble constant H0, while it does not affect the value of the Hubble constant in the calculation of the number density of baryons at the present time that is used to calculate recombination redshift. This may explain why the Hubble constants determined by local measurements and non-local measurements (such as CMB) are different. This suggests that gravitational particle production may have a non-negligible impact on H0 tension.

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引力粒子产生与哈勃张力

研究考虑了标量粒子的引力粒子产生对宇宙总有效能量密度的影响（从光子脱钩后至今）。对重粒子的影响是显著的。研究发现，引力粒子的产生会导致直接测量的哈勃常数 H0 值的有效增加，而在计算重子数量密度（用于计算重组红移）时，引力粒子的产生并不会影响哈勃常数的值。这也许可以解释为什么本地测量和非本地测量（如 CMB）确定的哈勃常数是不同的。这表明引力粒子的产生可能对 H0 张力有不可忽视的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Universe Physics and Astronomy-General Physics and Astronomy

CiteScore

4.30

自引率

17.20%

发文量

562

审稿时长

24.38 days

期刊介绍： Universe (ISSN 2218-1997) is an international peer-reviewed open access journal focused on fundamental principles in physics. It publishes reviews, research papers, communications, conference reports and short notes. Our aim is to encourage scientists to publish their research results in as much detail as possible. There is no restriction on the length of the papers.