ELI5: Explain Like I'm 5

Universality (dynamical systems)

Okay kiddo, so when we talk about universality in dynamical systems, we're basically talking about how different systems can behave in similar ways.

Imagine that you have a bunch of toys - like cars, blocks, and balls - and you want to see how they move when you push them. Each toy might move differently depending on its shape, weight, and other factors, right?

Well, the same thing happens with dynamical systems. These are basically just sets of rules that tell us how something changes over time. For example, we might have a dynamical system that models how the weather changes every day. Or we might have a system that describes how a population of animals grows and changes over time.

Now, what's really interesting is that sometimes different systems can behave in similar ways, even if they have different rules governing them. This is what we call universality. It's like how different toys might move in similar ways depending on how hard you push them, even if they have different shapes and sizes.

Scientists who study dynamical systems use a lot of math and computer programming to explore this idea of universality. They create lots of different systems with different rules and study how they behave over time. And what they've found is that there are certain patterns and behaviors that show up over and over again, no matter what the specific rules are.

For example, there's something called the "butterfly effect," which basically says that tiny changes in the initial conditions of a system can lead to huge differences in how it behaves over time. This idea shows up in a lot of different systems, from weather to stock markets to spinning tops.

So, universality is all about seeing how different things can be connected and similar, even if they seem really different at first. And scientists use math and computer programs to help them explore these connections and understand how the world works.