I Between a Zeptometer and the Planck length

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What exists that is smaller then a zeptometer yet larger than the Planck Length?
What exists between approximately 1 X 10 E-21 meters (preon length?) and the Planck Length of 1.6 X 10 E-35 meters?
 
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Hello. The Scale of the Universe 2 https://htwins.net/scale2/ shows top quark and neutrino there but it also says "the length shorter than this (femtometer) are not confirmed."
 
Probably not much.

Very high frequency ultraviolet photons can have arbitrarily small wavelengths up to Heisenberg uncertainty principle limits.

There is no good evidence that preons exist. Indeed, it would take a major reworking of of understanding of physics for them to work because of the experimental limits on binding energy for them (also here).

On the other hand, the point particle concept that is used in the Standard Model for fundamental particles may break down at sufficiently small distance scales beyond the reach of current experimental detection. Renormalization calculations for quantum field theory sometimes have cutoffs equivalent to distances on that order of magnitude.

This is the premise, for example, of string theory that posits that fundamental particles are excitations of tiny, but finite length superstrings, and isn't really too specific about how long those strings have to be because not a lot of observable consequences flow from that over a fairly wide range of many orders of magnitude.

Observational Lorenz invariance violation tests have excluded it to very fine distance scales, which tend to disfavor some kinds of theories in which space-time is itself discrete along the lines of loop quantum gravity, although there are workarounds for this issue.
 
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This is an alert about a claim regarding the standard model, that got a burst of attention in the past two weeks. The original paper came out last year: "The electroweak η_W meson" by Gia Dvali, Archil Kobakhidze, Otari Sakhelashvili (2024) The recent follow-up and other responses are "η_W-meson from topological properties of the electroweak vacuum" by Dvali et al "Hiding in Plain Sight, the electroweak η_W" by Giacomo Cacciapaglia, Francesco Sannino, Jessica Turner "Astrophysical...
this thread is to open up discussion on Gravi-GUT as theories of everything GUT or Grand Unified Theories attempt to unify the 3 forces of weak E&M and strong force, and Gravi-GUT want to add gravity. this peer reviewed paper in a journal on Gravi-GUT Chirality in unified theories of gravity F. Nesti1 and R. Percacci2 Phys. Rev. D 81, 025010 – Published 14 January, 2010 published by Physical Review D this paper is cited by another more recent Gravi-GUT these papers and research...
In LQG and LQC there are solutions called "black to white transition". I'll add some references: (Rovelli)https://arxiv.org/abs/1905.07251 (Rovelli)https://arxiv.org/abs/2302.03872 (Rovelli)https://arxiv.org/abs/1803.06330 (Rovelli)https://arxiv.org/pdf/1802.04264 (Rovelli)https://arxiv.org/abs/2108.12823 https://arxiv.org/abs/2304.02691 https://arxiv.org/abs/2110.07589 https://arxiv.org/abs/2009.01788 https://arxiv.org/abs/1911.12646 https://arxiv.org/abs/1801.03027...

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