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My understanding (haven't worked the equations myself) is that if you try to make the cosmological constant not constant, it gives a nonvanishing divergence for the stress-energy tensor. This would be inconsistent with the Einstein field equations, which require vanishing divergence.
So how does quintessence evade this? Doesn't quintessence act like a varying lambda?
So how does quintessence evade this? Doesn't quintessence act like a varying lambda?