https://www.youtube.com/watch?v=joeDff7EnAU

https://www.youtube.com/watch?v=GL77oOnrPzY

Nima Arkani-Hamed (born 5 April 1972) is a Canadian/American theoretical physicist with interests in high-energy physics, string theory and cosmology. Formerly a professor at Harvard, Arkani-Hamed is now on the faculty at the Institute for Advanced Study at Princeton.

Discrete character of space-time is in conflict with relativity.rpens this concept

Holography: Radical picture for how discreteness happens

2D encodes 3D information in space in subtle ways

String Theory sharpens the concept

Quantum Field Theory

Spacetime is doomed?

Because of Gravity and Quantum Mechanics

To look at shorter and shorter distances, light with higher and higher frequencies, we need to put more and more energy into smaller and smaller space

The act of looking at tiny distances produces a black hole that makes it impossible to see what’s going on in there

When we try to give operational meaning to a concept, it doesn’t mean the concept doesn’t exist

Antidecider Space

Holography

encodes three dimensional information

The cosmological questions relate back to time

If the notion of time goes away, a lot of our understanding of physics would have to change

So, time is the ultimate constraint on our understanding of reality