{"response":"{\"What is null geodesics in anti-de Sitter (AdS) spaces?

Null geodesics in anti-de Sitter (AdS) spaces are like the paths that light takes when it travels through a special kind of bouncy universe.

Imagine you're playing with a super bouncy ball in a room that has walls that pull you back, no matter where you go. That’s kind of what happens in AdS space, it's a universe that curves in a way that makes everything come back to you, like a giant cosmic trampoline.

Null geodesics are the special paths that light takes through this bouncy universe. Think of them as the straightest possible lines that light can follow, even though the space around it is curving and pulling things back.

In regular space, like the one we live in, light goes in a straight line, but in AdS spaces, because everything is curved and connected in a special way, those paths twist and turn, like bouncing off invisible walls.

Anti-de Sitter space is a kind of universe that has a negative curvature, it’s the opposite of our usual expanding universe. If you imagine sitting on a giant saddle-shaped surface, that’s what it feels like to be inside AdS space.

So null geodesics in AdS spaces are just light following its bouncy paths through this strange, curvy room. It's like playing with a bouncy ball, but instead of bouncing on the floor, everything bounces back toward you!