Varying physical constants and the lithium problem

We have used the recently published varying physical constants (VPC) approach to resolve primordial lithium abundance problem. The value of ratio $7Li$ hydrogen $7Li/H=1.400(\pm 0.023){\times}10^{-10}$ we calculated using this is about four times lower than that estimated standard lambda cold dark matter (${\Lambda}$CDM) cosmological model, and consistent with most agreed observational $1.6(\pm 0.3){\times}10^{-10}$. In VPC Einstein equations are modified include variation speed light $c$, gravitational constant $G$ ${\Lambda}$ Einstein-Hilbert action. Application cosmology naturally leads Plank $\hbar$ Boltzmann $k_B$ as well. They fixed values at scale factor $a\ll 1$: $c=c_0/e$, $G=G_0/e^3$, $\hbar=\hbar_0/e$ $k_B=k_{B0}/e^{5/4}$, where $e$ Euler's number (=2.7183). Since reduces same form ${\Lambda}$CDM very small factors, could use an existing Big-Bang nucleosynthesis (BBN) code AlterBBN above changes calculate element abundances under cosmology. Among other baryon photon ${\eta}=6.1{\times}10^{-10}$ are: $4He/H =0.2478 (\pm 0.041)$, $D/H =2.453(\pm 0.041){\times}10^{-5}$ $3 He/H=2.940(\pm 0.049){\times}10^{-5}$.