Why Isn't Dark Energy Considered a Fundamental Force?

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Dark energy is not classified as a fundamental force despite its role in the universe's expansion, primarily due to the lack of understanding about its nature. While there are four known forces, dark energy's characteristics do not fit neatly into the established categories. The discussion raises the idea that dark energy could be redefined similarly to gravity, but its current terminology reflects its mysterious properties. The complexity of integrating dark energy into existing theories contributes to its ambiguous status. Further exploration and understanding of dark energy are necessary for a clearer classification.
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Basically what the title asks. I understand that there are four known forces, three of which have been unified, the other, gravity which simply doesn't want to integrate. But the reason I ask, is why isn't dark energy considered a force? I mean, if its thought to be causing the expansion of the universe, why then is it not a force? Is it simply because not enough is known about dark energy?
 
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In my understanding, it may as well be called a force, as much as gravity is called a force. Without knowing what 'it' is, it could just as easily be moved to the other side of Einstein's equations and be called 'dark gravity of the energy kind'. But 'dark energy' has a much better ring to it.

They don't seem to call relativity theory classical around here. You might get better answers if you posted in the relativity section.
 
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