Grossly incorrect.
The stress energy tensor T ͣ ͤ in Einstein’s field equations is the effect of external forces which can include electromagnetism via the electromagnetic stress energy tensor;
The overall equation is;
T ͣ ͤ = [(ρ + p/c²)(dx ͧ/ds)(dx ͥ/ds) - g ͣ ͤ p/c²] + ε₀(F ͣ ͤ Fₑͨ + (1/4)g ͧ ͨ F ͣ ͤ Fₐₑ)
The first term is the contribution from gravity the second term from electromagnetism.
The operative word in that paragraph is "can", not "do" (as in include external EM forces in LCDM).
Some early generalizations of Einstein's gravitational theory, known as classical unified field theories, either introduced a cosmological constant on theoretical grounds or found that it arose naturally from the mathematics. For example, Sir Arthur Stanley Eddington claimed that the cosmological constant version of the vacuum field equation expressed the "epistemological" property that the universe is "self-gauging", and Erwin Schrödinger's pure-affine theory using a simple variational principle produced the field equation with a cosmological term.
Cosmological constant - Wikipedia
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