Extremely Correlated Fermi Liquid theory for $U=\infty$, $d=\infty$ Hubbard model to ${\cal O}(λ^3)$

We present the ${\cal O}(λ^3)$ results from the $λ$ expansion in the extremely correlated Fermi liquid theory applied to the infinite-dimensional $t$-$J$ model (with $J=0$), and compare the results with the earlier ${\cal O}(λ^2)$ results as well as the results from the dynamical mean field theory. We focus attention on the $T$ dependence of the resistivity $ρ(T)$, the Dyson self energy, and the quasiparticle weight $Z$ at various densities. The comparison shows that all the methods display quadratic in T resistivity followed by a quasi-linear in T resistivity characterizing a strange metal, and gives an estimate of the different scales of these variables relative to the exact results.

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