If you assume the laws of physics hold even for advanced civilisation then they are not going to be able to find a loophole in the second law of thermodynamics

If you assume the laws of physics hold even for advanced civilisation then they are not going to be able to find a loophole in the second law of thermodynamics :) Even if you assume that dark energy can be harvested then any advanced civilisation is still going to be energy constrained - Bremmermann's limit far exceeds any energy that can be harvested from dark energy [1]. 1. https://en.wikipedia.org/wiki/Bremermann%27s_limit https://en.wikipedia.org/wiki/Bremermann%27s_limit