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

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Discussion Overview

The discussion revolves around the existence of particles beyond the graviton and Standard Model particles, exploring the limitations of current models and the potential for undiscovered particles. It touches on theoretical implications, experimental searches, and the nature of scientific knowledge in particle physics.

Discussion Character

  • Debate/contested
  • Exploratory
  • Technical explanation

Main Points Raised

  • Some participants argue that we cannot definitively know there are no additional particles beyond the graviton and Standard Model particles, emphasizing the provisional nature of scientific models.
  • Others highlight that the search for supersymmetry particles at the LHC indicates ongoing efforts to discover particles beyond the Standard Model.
  • A participant states that accelerators do not detect particles, suggesting that the probability of a particle existing at typical energies without detection is 100%.
  • Another viewpoint suggests that while we have experimental access to certain particles, many theoretical frameworks include additional particles that may remain undetected.

Areas of Agreement / Disagreement

Participants generally agree that the current understanding of particles is limited and that there is uncertainty regarding the existence of additional particles. Multiple competing views remain regarding the implications of current experimental searches and the nature of scientific knowledge.

Contextual Notes

The discussion reflects limitations in current models and the dependence on experimental evidence, with unresolved questions about the detection capabilities of particle accelerators and the theoretical implications of undiscovered particles.

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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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.
 
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.
 
What is the probability the existence a particle at our typical energies can exist and a acelerattor can´t detect?
 
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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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.
 

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