Functional renormalization group

Okay kiddo, let me tell you about something called functional renormalization group.

So, you know that everything in our universe is made up of tiny particles called atoms, right? Now, these atoms come together to form different things like rocks, water, air and even living things like us.

But sometimes, we want to study how these particles work together to form something big, like a crystal or a magnet. That's where functional renormalization group comes in.

Functional renormalization group is basically a fancy way of studying how small, microscopic particles (like atoms) behave when they come together to form these big things.

Like when we zoom in a picture on our phone or camera, the picture gets grainier and we can see more details, right? In the same way, functional renormalization group helps us to zoom in on the microscopic particles and see how they behave when they're close to each other.

Scientists use math and equations to study how these particles interact with each other, and how they change when they come together to form something bigger. It's like putting together a puzzle, but with tiny particles and lots of math.

Functional renormalization group can help us to understand things like how magnets work or how crystals form, and maybe even help us to discover new things we didn't even know existed!

So that's a brief explanation of functional renormalization group, I hope you understood it, little one!