Are Graviton and Standard Model Particles the Only Ones in the Universe?

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In summary, we can only say that our current understanding of physics is based on the known particles and models, but there may still be unknown particles that could potentially be discovered in the future.
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Garrulo
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How we can know that there are no more particles that graviton and standard model particles??
 
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  • #2
Garrulo said:
How we can know that there are no more particles that graviton and standard model particles??
We DON'T know. What we have is a consistent and useful model of reality that works very well. If/when other particles are discovered, the model will have to be changed. Dark matter may lead to that situation.

Physics builds models based on what is known, not what is unknown.
 
  • #3
Garrulo said:
How we can know that there are no more particles that graviton and standard model particles??

If you have paid some attention to the LHC results and operations these past 2 years, you would have heard of their search for supersymmetry particles. Clearly, this is an example where high energy physicists ARE trying to see if there are other particles beyond just those within the Standard Model.

Zz.
 
  • #4
What is the probability the existence a particle at our typical energies can exist and a acelerattor can´t detect?
 
  • #5
Garrulo said:
What is the probability the existence a particle at our typical energies can exist and a acelerattor can´t detect?

Accelerators do not detect particles. So the probability is 100%.

Zz.
 
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  • #6
Garrulo said:
How we can know that there are no more particles that graviton and standard model particles??
We don't "know" this at all. The graviton and the Standard-Model particles are the ones that we have had experimental access to. Most supersets of these two theories include additional particles, particles that we may or may not be able to detect evidence of.
 

1. What are known particles?

Known particles are the fundamental building blocks of matter that have been identified and studied by scientists. These particles include quarks, leptons, and bosons, which make up atoms and subatomic particles.

2. How many known particles are there?

As of now, there are 61 known particles that are described by the Standard Model of particle physics. However, scientists are constantly researching and discovering new particles, so this number may change in the future.

3. What is the difference between known particles and unknown particles?

Known particles are those that have been observed and studied by scientists, while unknown particles are theoretical particles that have not yet been observed or confirmed by experiments.

4. Why is it important to study known particles?

Studying known particles helps us understand the fundamental laws of nature and how the universe works at a microscopic level. It also allows us to develop new technologies and applications, such as medical imaging and energy production.

5. Are there any unknown particles that could exist?

Yes, there are many theoretical particles that could exist, such as dark matter particles and supersymmetric particles. These particles are currently being researched and studied by scientists to further our understanding of the universe.

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