Hmm so that would be a system being out of equilibrium but in a "negative" direction, which is nonsense since any amount of non-equilibrium is a positive amount of free energy.
So, I don't understand any of the math in that paper but is there any easy/intuitive way to explain why a higher information density would require negative free energy?
I guess I need to understand the relationship between information density and free energy first. Hmm.
> So, I don't understand any of the math in that paper but is there any easy/intuitive way to explain why a higher information density would require negative free energy?
Not really, no. If you don't have the equivalent of a good undergraduate education in physics very little about QFT is going to be accessible to you.