Comments about "Holographic principle" in Wikipedia

This document contains comments about the article Holographic principle in Wikipedia

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In the last paragraph I explain my own opinion.

Contents

• 1. The AdS/CFT correspondence
• 2. Black hole entropy
• 3. Black hole information paradox
• 4. Limit on information density
• 5. High-level summary
• 5.1 Unexpected connection
• 5.2 Energy, matter, and information equivalence
• 6. Experimental tests
• 7. See also

Reflection

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• Reflection 3 -

Introduction

The article starts with the following sentence.

The holographic principle is an axiom in string theories and a supposed property of quantum gravity that states that the description of a volume of space can be thought of as encoded on a lower-dimensional boundary to the region — such as a light-like boundary like a gravitational horizon.

This text is difficult to understand. One of the basic rules of proper science is define all concepts used as clear as possible.
In the sentence what means encoded. Which boundary I assume they mean something like a sphere i.e. a 2D sphere? In physical sense a sphere (a balloon) is also a 3D object.
You cannot use the word 'gravitational horizon' because the gravitational field of an object has no boundary.

1. The AdS/CFT correspondence

2. Black hole entropy

3. Black hole information paradox

4. Limit on information density

5. High-level summary

5.1 Unexpected connection

5.2 Energy, matter, and information equivalence

6. Experimental tests

7. See also

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• Holography Commments

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