Universe smaller than wavelengths?

In summary, in the very early universe, particles existed despite their diameter being smaller than their wavelengths due to short wavelengths being allowed. However, our current theories have limitations in describing this situation and we are still working on understanding it through physics.
  • #1
kashiark
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How did particles exist in the very, very early universe when its diameter was smaller than their wavelengths? Are we just supposed to be content with the supposition that wave descriptions are impractical in this situation?
 
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  • #2
I believe you are talking about the observable universe.

I discussed it here:
https://www.physicsforums.com/showthread.php?t=371333

so correct, it early Universe only short wavelengths were allowed, hence particles were very hot. I looked at it from E and t as non-commuting variables, you - from p and maximum size.
 
  • #3
kashiark said:
How did particles exist in the very, very early universe when its diameter was smaller than their wavelengths? Are we just supposed to be content with the supposition that wave descriptions are impractical in this situation?

As of now we have no theory that describes the very early universe. All our current theories run into big problems there. Are we supposed to be content with it? No. That's what physics is all about: figuring it out, coming up with a theory that accurately describes these things.
 
  • #4
We don't have quantum gravity theory yet,
so the semi-classical approach is the best we can do
 
  • #5


I understand that the concept of the universe being smaller than wavelengths can be confusing and counterintuitive. However, this is a fundamental aspect of quantum mechanics and the behavior of particles at a very small scale.

In the very early universe, the laws of physics were very different from what we observe today. At this time, the universe was extremely hot and dense, and the particles that existed were in a state of high energy and constantly interacting with each other. In this environment, the concept of wavelength becomes less relevant as particles are constantly exchanging energy and changing their properties.

Furthermore, the concept of wavelength is based on the idea of a continuous wave, which does not accurately describe the behavior of particles at a quantum level. Instead, particles are described by wave functions that represent the probability of their location and behavior. In this context, the size of the universe being smaller than a particle's wavelength does not necessarily mean that the particle cannot exist.

It is also important to note that our current understanding of the early universe is based on theoretical models and observations, and it is possible that our understanding may change as we continue to explore and learn more about the universe. As scientists, we are constantly seeking to improve our understanding and refine our theories.

In conclusion, while the concept of the universe being smaller than wavelengths may seem counterintuitive, it is a fundamental aspect of quantum mechanics and our understanding of the early universe. We should not be content with suppositions, but rather continue to explore and expand our knowledge through scientific inquiry and experimentation.
 

FAQ: Universe smaller than wavelengths?

What is the concept of "Universe smaller than wavelengths?"

The concept of "Universe smaller than wavelengths" refers to the idea that there could exist structures or particles in the universe that are smaller than the wavelengths of electromagnetic radiation. This is based on the understanding that electromagnetic radiation, such as light, has a specific wavelength and particles can have a size smaller than this wavelength.

How is this concept related to quantum mechanics?

This concept is closely related to quantum mechanics, which is the branch of physics that studies the behavior of particles at the subatomic level. Quantum mechanics allows for the existence of particles that are smaller than the wavelengths of electromagnetic radiation, and it provides a framework for understanding the behavior of these particles.

Is there any evidence to support the existence of a "Universe smaller than wavelengths?"

While there is currently no direct evidence for the existence of a "Universe smaller than wavelengths," some theories within physics, such as string theory, suggest the possibility of subatomic structures or particles that are smaller than wavelengths. However, more research and experimentation is needed to confirm or refute this concept.

How does this concept challenge our understanding of the universe?

This concept challenges our understanding of the universe by introducing the possibility of structures and particles that are beyond what we can currently observe or measure. It also raises questions about the fundamental nature of reality and how the laws of physics may operate at the subatomic level.

Could the concept of a "Universe smaller than wavelengths" have practical applications?

While this concept is still largely theoretical, it has the potential to revolutionize our understanding of the universe and could potentially lead to new technologies and advancements in fields such as quantum computing and particle physics. However, further research and experimentation are needed to fully understand the implications and potential applications of this concept.

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