I'm asymptotically free!

As it gets warm, my energy level goes up which makes me decouple from my work!
Meaning that my beta function is negative, or in other words I'm asymptotically free and therefore I'm well-defined!!! just like my twin brother QCD!

That's why over the winter I usually become too complicated. My coupling grows and you can't tell me apart from my work!!!
In very low energy there is no sign of me!

While during summer, I am trivial!
If you see me in a gang of friends in summer, you can approximate our behavior even with a classical many-body problem! Definitely, there is nothing profound in our talks!