Do varying physical constants provide solution to the lithium problem Article Swipe

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Rajendra P. Gupta ·

YOU? · · 2020 · Open Access ·

We have used the recently published varying physical constants (VPC) approach to resolve the primordial lithium abundance problem. The value of the ratio of 7Li to hydrogen $7Li/H=1.400(+-0.023){\times}10^{-10}$ we have calculated using this approach is about four times lower than that estimated using the standard lambda cold dark matter (${\Lambda}$CDM) cosmological model, and is consistent with the most agreed observational value of $1.6(+-0.3){\times}10^{-10}$. In the VPC approach Einstein equations are modified to include the variation of the speed of light $c$, gravitational constant $G$ and cosmological constant ${\Lambda}$ using the Einstein-Hilbert action. Application of this approach to cosmology naturally leads to the variation of the Plank constant $h$ and the Boltzmann constant $k_B$ as well. They approach fixed values at the scale factor a<<1: $c=c_0/e$, $G=G_0/e^3$, $h=h_0/e$ and $k_B=k_{B0}/e^{5/4}$, where $e$ is the Euler's number (=2.7183). Since the VPC cosmology reduces to the same form as the ${\Lambda}$CDM cosmology at very small scale factors, we could use an existing Big-Bang nucleosynthesis (BBN) code AlterBBN with the above changes to calculate the light element abundances under the VPC cosmology. Among other abundances we have calculated at baryon to photon ratio ${\eta}=6.1{\times}10^{-10}$ are: $4He/H =0.2478 (+-0.041)$, $D/H =2.453(+-0.041){\times}10^{-5}$.

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Physics

Cosmology

Cosmological Constant

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Physics Big Bang nucleosynthesis Cosmology Gravitational constant Cosmological constant Lambda Astrophysics Nucleosynthesis Abundance of the chemical elements Baryon Mathematical physics Particle physics Quantum mechanics General relativity Galaxy Stars

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Type: preprint
Language: en
Landing Page: https://arxiv.org/pdf/2010.13628.pdf
OA Status: green
Cited By: 2
References: 8
Related Works: 20
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Title: Do varying physical constants provide solution to the lithium problem

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Type: preprint

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Language: en

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Publication year: 2020

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Publication date: 2020-10-23

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Authors: Rajendra P. Gupta

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Landing page: https://arxiv.org/pdf/2010.13628.pdf

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Concepts: Physics, Big Bang nucleosynthesis, Cosmology, Gravitational constant, Cosmological constant, Lambda, Astrophysics, Nucleosynthesis, Abundance of the chemical elements, Baryon, Mathematical physics, Particle physics, Quantum mechanics, General relativity, Galaxy, Stars

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Cited by: 2

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