Theoretical physicist Sabine Hossenfelder is the author of *Lost in Math: How Beauty Leads Physics Astray,* a thoughtful critic of imaginative cosmologies.

Like the universe as a hologram:

Today, I want to tell you why some scientists believe that our universe is really a 3-dimensional projection of a 2-dimensional space. They call it the “holographic principle” and the key idea is this.

Usually, the number of different things you can imagine happening inside a part of space increases with the volume. Think of a bag of particles. The larger the bag, the more particles, and the more details you need to describe what the particles do. These details that you need to describe what happens are what physicists call the “degrees of freedom,” and the number of these degrees of freedom is proportional to the number of particles, which is proportional to the volume.

At least that’s how it normally works. The holographic principle, in contrast, says that you can describe what happens inside the bag by encoding it on the surface of that bag, at the same resolution. …

Personally I think that the motivations for the holographic principle are not particularly strong and in any case we’ll not be able to test this hypothesis in the coming centuries. Therefore writing papers about it is a waste of time. But it’s an interesting idea and at least you now know what physicists are talking about when they say the universe is a hologram.

Sabine Hossenfelder, “Why do some scientists believe that our universe is a hologram?” atBackRe(Action)

And in our next post, experimental physicist Rob Sheldon replies.

*Further reading on the hologram universe:*

Sabine Hossenfelder: Can gravitational wave interferometers tell us if we live in a hologram universe? It’s actually a good thing if theses in physics don’t gain currency just because they make good TED talks. That could be part of their problem.

How is the hologram universe coming?

Astrophysicist Niayesh Afshordi Explains The Holograph Universe To Suzan Mazur At Oscillations

and

“Substantial evidence” claimed for universe as a hologram

as to:

Like Hossenfelder, I also think that is nonsense.

And I also agree with Hossenfelder that “the motivations for the holographic principle are not particularly strong” and that the empirical evidence for it is non-existent, i.e. “in any case we’ll not be able to test this hypothesis in the coming centuries”.

Whereas, on the other hand, I do believe that the evidence that the universe is a ‘3-dimensional projection from a higher dimension’ is very strong.

In the following video, the discovery of the higher dimensional nature of the square root of negative one, which is integral to quantum mechanics, and the discovery of higher dimensional geometry, which is integral to General Relativity, are discussed:

The history of the square root of negative one is particularly interesting to look at. Descartes had rejected complex roots and coined the derogatory term “imaginary” to describe the square root of negative one. Whereas, Gauss, who was the mathematician who finally clearly explained the higher dimensional nature behind the square root of negative one, suggested that complex magnitudes be called “lateral” instead of “imaginary” magnitudes since they represent a dimensional extension of the continuum. Gauss also proposed that complex magnitudes be awarded “full civil rights.”

The author further comments, in the language of Plato’s allegory of the cave, complex numbers represent “forms” from a higher dimension casting “shadows” on the real number line.

And in quantum mechanics, we find that the square root of negative one is necessary for describing the wave packet prior to measurement.

What was not mentioned in the preceding ‘The Mathematics Of Higher Dimensionality’ video, or in the article, is that the wave function is also represented as being in an infinite dimensional Hilbert space:

Moreover, we find that the infinite dimensional Hilbert space takes an infinite amount of information to describe properly.

Here is an interesting quote about the infinite dimensional Hilbert Spaces in quantum mechanics that is particularly relevant to Hossenfelder’s video:

As should be needless to say, the preceding findings are very comforting to Christian presuppositions about the omniscient and omnipresent Mind of God upholding this universe in its continual existence.

Further evidence for the the claim that the omniscient and omnipresent Mind of God is upholding this universe in its continual existence is found in the extremely tight correspondence between the actions we see in quantum mechanics and some of the fundamental defining attributes that we have for consciousness. (i.e. the defining attributes of Free will and ‘the experience of the now’ respectfully)

Supplemental notes: