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During inflation, why/how does a negative pressure guarantee a constant energy density?
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This is the most fantastical and difficult concept of inflation for me - I do not really understand how the energy density can stay constant as the volume increases. Where does this energy come from? I understand that gravity acts as a negative energy and effectively cancels out any positive energy(according to Alan Guth). What I don't understand is why this is particularly important - energy is still being created. Or am I misunderstanding how inflation works?
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