**Traversable wormholes in the expanding universe: A theoretical proof. The expansion of the universe at some stage of evolution is well described by the Friedmann model. It was derived from general relativity a hundred years ago, but it is still considered one of the most important and relevant cosmological models.**

## Traversable Wormholes in the Expanding Universe: Theoretical Possibility and Recent Research

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**Introduction**

The vastness of the universe and the mysteries it holds continue to captivate scientists and the general public alike. One intriguing concept that has long fascinated researchers is the possibility of traversable wormholes, hypothetical tunnels connecting distant regions of the universe or even different universes.

**The Friedmann Universe and Traversable Wormholes**

To understand the theoretical possibility of traversable wormholes, we need to consider the Friedmann universe, a model that describes the expansion of the universe. Developed by Alexander Friedmann in the early 20th century, this model is still considered one of the most important and relevant cosmological models for studying traversable wormholes.

**Wormholes in General Relativity and Traversable Wormholes**

The idea of wormholes arose from the theory of general relativity, proposed by Albert Einstein. This theory describes gravity as a curvature of spacetime, and it allows for the existence of wormholes, which are regions of spacetime with a high degree of curvature. Not all wormholes are traversable. Some may be unstable or may collapse under their own gravitational pull. However, certain types of wormholes, known as traversable wormholes, could theoretically allow for travel between different regions of the universe or even different universes.

**Recent Research on Traversable Wormholes in the Expanding Universe**

A team of astrophysicists from RUDN University in Russia recently conducted research that provides theoretical proof of the existence of traversable wormholes in the Friedmann universe. Their findings were published in the journal Universe.

**Key Findings of the Research on Traversable Wormholes**

The researchers investigated a generalized form of the Lemaître–Tolman–Bondi solution, which describes the evolution of spherically symmetric distributions of electrically neutral dust in general relativity. They found that traversable wormholes could exist in such a setting under certain mathematical conditions.

**Implications of the Research on Traversable Wormholes**

The research suggests that traversable wormholes are theoretically possible in the expanding universe. However, further research is needed to determine whether these wormholes can exist in reality and whether they can be used for travel between different regions of the universe or different universes.

**Potential Observational Signs of Traversable Wormholes**

The researchers also suggested that certain observational signs, such as the properties of the cosmic microwave background and magnetic fields, may be associated with traversable wormholes. Future research may focus on comparing the characteristics of these wormhole models with observed parameters of cosmic voids and other inhomogeneities in our universe.

**Wrapping Up**

The theoretical possibility of traversable wormholes in the expanding universe is an exciting concept that opens up new avenues for exploration and research in cosmology. While many challenges and uncertainties remain, the recent findings provide a solid foundation for further investigations into the nature and existence of these enigmatic structures.

## FAQ’s

### 1. What is a wormhole, and how does it relate to the Friedmann universe?

A wormhole is a hypothetical tunnel connecting distant regions of the universe or even different universes. It arises from the theory of general relativity, which describes gravity as a curvature of spacetime. The Friedmann universe is a model that describes the expansion of the universe. The research suggests that traversable wormholes could exist in such a setting under certain mathematical conditions.

### 2. What are traversable wormholes, and how do they differ from other types of wormholes?

Traversable wormholes are a specific type of wormhole that theoretically allows for travel between different regions of the universe or different universes. Not all wormholes are traversable, as some may be unstable or may collapse under their own gravitational pull.

### 3. What is the significance of the recent research conducted by astrophysicists from RUDN University?

The recent research provides theoretical proof of the existence of traversable wormholes in the Friedmann universe. The researchers investigated a generalized form of the Lemaître–Tolman–Bondi solution and found that traversable wormholes could exist in such a setting under certain mathematical conditions.

### 4. What are the potential observational signs associated with traversable wormholes?

The researchers suggested that certain observational signs, such as the properties of the cosmic microwave background and magnetic fields, may be associated with traversable wormholes. Future research may focus on comparing the characteristics of these wormhole models with observed parameters of cosmic voids and other inhomogeneities in our universe.

### 5. What are the implications of the research on traversable wormholes?

The research suggests that traversable wormholes are theoretically possible in the expanding universe, opening up new avenues for exploration and research in cosmology. While many challenges and uncertainties remain, the findings provide a solid foundation for further investigations into the nature and existence of these enigmatic structures.

## Links to additional Resources:

1. https://www.nasa.gov/ 2. https://www.space.com/ 3. https://www.scientificamerican.com/.### Related Wikipedia Articles

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The Friedmann–Lemaître–Robertson–Walker metric (FLRW; ) is a metric based on an exact solution of the Einstein field equations of general relativity. The metric describes a homogeneous, isotropic, expanding (or otherwise, contracting) universe that is path-connected, but not necessarily simply connected. The general form of the metric follows from the geometric...

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**Wormhole**

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**General relativity**

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