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One of the first theoretical proposals for understanding high temperaturesuperconductivity in the cuprates was Anderson's RVB theory using a Gutzwillerprojected BCS wave function as an approximate ground state. Recent work byParamekanti, Randeria and Trivedi has shown that this variational approachgives a semi-quantitative understanding of the doping dependences of a varietyof experimental observables in the superconducting state of the cuprates. Inthis paper we revisit these issues using the ``renormalized mean field theory''of Zhang, Gros, Rice and Shiba based on the Gutzwiller approximation in whichthe kinetic and superexchange energies are renormalized by differentdoping-dependent factors $g_{t}$ and $g_{S}$ respectively. We point out anumber of consequences of this early mean field theory for experimentalmeasurements which were not available when it was first explored, and observethat it is able to explain the existence of the pseudogap, properties of nodalquasiparticles and approximate spin-charge separation, the latter leading tolarge renormalizations of the Drude weight and superfluid density. We use theLee-Wen theory of the phase transition as caused by thermal excitation of nodalquasiparticles, and also obtain a number of further experimental confirmations.Finally, we remark that superexchange, and not phonons, are responsible ford-wave superconductivity in the cuprates.Comment: 17 pages, 3 figures. Published version with significant revision from  the previosuly posted versio

The physics behind high-temperature superconducting cuprates: the plain vanilla version of RVB