Why do some scientists believe that our universe is a hologram?

In this video, I explain why some scientists believe that our universe is a hologram and we really live in the 2-dimensional projection of a higher dimensional space.

First, I explain just what physicists mean by the "holographic principle." The holographic principle says that the degrees of freedom inside a volume of space can be described by information on the surface of that volume at the same resolution.

Then I explain that this relation goes back to ideas about the black hole entropy and string theory in space with a negative cosmological constant, the so-called Anti-de Sitter space. I briefly mention what the problems are with these arguments.

I then discuss a recent idea of Verlinde & Zurek about how one could test holography experimentally.

Finally, I tell you my own opinion about this. As so often, I am highly skeptical that wild speculation will lead to progress.

References

Bekenstein's paper about black hole entropy:

https://journals.aps.org/prd/abstract/10.1103/PhysRevD.7.2333

More info about Anti-de Sitter space:

https://arxiv.org/abs/1611.01118

Verlinde & Zurek's paper about measuring holography with gravitational wave interferometers:

https://arxiv.org/abs/1902.08207

I briefly summarized this here:

https://backreaction.blogspot.com/2019/04/is-universe-hologram-gravitational.html

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Видео Why do some scientists believe that our universe is a hologram? канала Sabine Hossenfelder