ELI5: Explain Like I'm 5

Hyperkähler manifold

Okay kiddo, so imagine you have a big playground filled with toys and your friends. But instead of just one playground, you have three different playgrounds, each with different types of toys and friends.

A hyperkähler manifold is like having three of these playgrounds, but instead of toys and friends, it's a special kind of playground for mathematicians called a "manifold." A manifold is a kind of space that is curved or bent in different ways, but can be measured with math.

When we talk about a hyperkähler manifold, we mean that there are these three playgrounds or "dimensions" that are all related to each other and have a special kind of symmetry. Just like how the symmetry of the monkey bars in one playground might be different than the slide in another playground.

And just like how you might run around and explore each playground, mathematicians can explore the different dimensions of a hyperkähler manifold using equations and formulas. They can use these equations to describe the shape and structure of the manifold, which helps them understand more about the math that goes into making it.

So basically, a hyperkähler manifold is like having three playgrounds that are all connected and have a special kind of symmetry, and mathematicians use equations to explore and understand them better. Cool, huh?