Comments about "Wormhole" in Wikipedia

This document contains comments about the article Wormhole in Wikipedia
In the last paragraph I explain my own opinion.

Contents

Reflection

Introduction

The article starts with the following sentence.
A wormhole (Einstein-Rosen bridge) is a speculative structure connecting disparate points in spacetime, and is based on a special solution of the Einstein field equations.
Spacetime does not exists in reality. All physical structures that exist (in time) are based on connections in space.
A wormhole can be visualized as a tunnel with two ends at separate points in spacetime (i.e., different locations, different points in time, or both).
There exist no connections between different points in different physical time.
Starting point in any discussion should be that the physical time of all points in the universe is the same. That does not mean that all clocks which are initialised at the same physical time always show the same clock reading.
Wormholes are consistent with the general theory of relativity, but whether wormholes actually exist remains to be seen. Many scientists postulate that wormholes are merely projections of a fourth spatial dimension, analogous to how a two-dimensional (2D) being could experience only part of a three-dimensional (3D) object.
All objects in the universe are 3D objects. There are no 2D objects. A sphere is not a 2D object. A sphere is the surface of a spherical 3D object.
Theoretically, a wormhole might connect extremely long distances such as a billion light years, or short distances such as a few meters, or different points in time, or even different universes
All this text is speculative. There are no different universes.
Any discussion about different universes should study with a clear definition of the boundaries of each universe and between different universes which both exist simultaneous.

1. Visualization

2. Terminology

2.1 Modern definitions

3. Development

3.1 Schwarzschild wormholes

3.1.1 Einstein–Rosen bridges

3.2 Traversable wormholes

4. Raychaudhuri's theorem and exotic matter

5. Modified general relativity

6. Faster-than-light travel

7. Time travel

8. Interuniversal travel

9. Metrics

10. In fiction

11. See also

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Created: 17 December 2022

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