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B Void between Plank particle and Quark... what else?

  1. May 15, 2016 #1

    Between the Planck particle and the Quark, these is a sizeable relative difference of about 10^15, or in other words and size unit, as if there were no objet whose size would stand between ours (about 1.70 m) and Antares... this is not only about vaccum (or void) in absolute term but also about potential fill rate between these two units of measure.

    My questions: Why such a void between 10^-35 and 10^-20? Why not between two other size limits?
    Does any other object exist between these Quark and Plank particle?

    Thanks !
  2. jcsd
  3. May 15, 2016 #2


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    Staff: Mentor

    There is no "planck particle", or at least nothing like that has ever been observed or even predicted.
    In the standard model, particles do not have a size, they are point-like.
    Be careful with questions that make various assumptions already, because those assumptions can be wrong and then it is hard to impossible to answer the questions.

    A gap that could exist is between the mass of the known particles and the Planck energy. We don't know if there is a gap - we simply do not have colliders powerful enough to discover potential particles in that gap. The Planck scale could also be much lower, if there are small extra dimensions. And if there is a gap, we do not know why it exists.
    All those questions are studied in particle physics.
  4. May 15, 2016 #3
    Thank for your reply

    FYI, my question was based on this YouTube film:"Size comparison of the universe 2016".

    Actually what stroke me are those gaps between the different objects in the micro world.
    For me the question is: Can the universe produce an infinite number of sizes from the "smallest" to the "biggest" object or is there any granularity that limit this scheme?
    Also interesting: It seems that from particles to a certain size limit, objects are "round", then they are not (like cells, trees, us, etc.) and from a certain threshold gravity makes them round again, then those objects looke like filaments, clusters not really round. In other words object forms alternate from round to others depending on the scale. Doe it make sense ?
  5. May 15, 2016 #4


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    Forget all the numbers assigned to things below the upper size limit for the quark. The neutrino numbers are just nonsense and the others are at best hypothetical.
    There could be a lower limit - we don't know. Our current theories of physics cannot describe processes of the size of the Planck length, which means there has to be some new physics. Everything larger than a lower limit (or everything, if such a limit does not exist) up to the size of the observable universe can in theory be studied.
    There are nuclei that are not spherical. Everything smaller than lacks the structure to be non-spherical to our knowledge. The earth/moon system and Jupiter's moon system are not round, and at the size of stars. There are round and non-round structures on every scale.
  6. May 15, 2016 #5
    Yes indeed a lot of things on Internet...

    Thank you for your replies !
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