Can a universe exist without matter?

In summary, the conversation discusses the possibility of a universe existing without matter, only consisting of time, space, and energy. It is explained that in classical GR, such a universe can exist, but in quantum gravity, it is still uncertain. The concept of alternate dimensions is also mentioned as an example of a universe without matter. The question of the relevance of this concept is raised, as it may be impossible to observe or verify.
  • #1
Dremmer
92
0
Just including time, space and energy, but no matter?
 
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  • #2
If by "can a universe exist" you mean "does a consistent classical GR description exist", then yes you can have a universe with energy (just radiation) but no matter, or you can even have a universe with just pure gravity - a so-called vacuum solution.
 
  • #3
But what if in quantum gravity?
 
  • #4
Yes, Space Time and Energy, that's what most things consist of such as the unverse. Matter makes up parts of the unoverse such as our solar system and our planet. Think of alternate dimensions that you here of on TV or in Movies. They sometimes have no matter but yet they exist. This topic can be tricky but yes i pretty sure you can have a universe with no matter.
 
  • #5
Why is that even interesting, if it's inherently impossible to observe or verify?
 
  • #6
Duplicate thread.
 

1. Can a universe exist without matter?

According to current scientific understanding, it is highly unlikely for a universe to exist without matter. Matter is a fundamental component of the universe and plays a crucial role in its formation and functioning.

2. What is the role of matter in the universe?

Matter makes up everything we see and interact with in the universe, including stars, planets, and galaxies. It also interacts with other forms of energy, such as gravity and electromagnetism, to shape the structure and behavior of the universe.

3. Is there any evidence for a universe without matter?

So far, there is no scientific evidence to support the existence of a universe without matter. All observations and experiments point to the fact that matter is an essential component of the universe.

4. Can the universe exist in a state of pure energy?

The concept of a universe made entirely of energy is a popular topic in science fiction, but there is no scientific evidence to support it. Energy and matter are closely related, and it is impossible to have one without the other in our current understanding of the universe.

5. Could there be other forms of matter that we are not aware of?

While there is always the possibility of unknown forms of matter, current scientific models and theories have not found any evidence for their existence. Extensive research and experiments are continually being conducted to expand our understanding of the universe and its components.

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