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first of all i am a little bit confused about the difference between casimir and van der waals forces?

isn't it so, that both forces are consequences of Lifgarbagez's theory?

so how can you distinguish between them?

another question I asked myself is, how do Casimir and Van der Waals force depend on the curvature of the spacetime.

is there an expansion of Lifgarbagez's theory that deals with this topic?

besides, i do not understand how it is possible to calculate the van der waals force in quantum mechanics? i thought that fluctuations are quantum electrodynamics, but in quantum mechanics (cohen-tannoudji )they actually calculate this force between 2 hydrogen atoms?