What is a particle?
https://www.quora.com/What-is-a-particle/answer/Hossein-Javadi-1?share=b166fc35&srid=F7rA
Complexity the particle and field concept in quantum mechanics has caused some physicists to deny the existence of a particle and others the field.
“Are the fundamental constituents fields or particles? As this paper shows, experiment and theory imply unbounded fields, not bounded particles, are fundamental”. [1]
“I arrive at the conclusion that in addition to there being no particles, there are not even fields! The fields of QFT are operators”. [2]
Generally, we have almost the same understanding and imagination of large objects (at the level of molecules and larger). But in the case of subatomic particles, there is no clearly defined and visualized concept, and there are many uncertainties, especially in the case of photon and graviton. Therefore, any theory offers certain understanding (such as loop and string) of these particles. However, we are using the particles for graviton and photon without any imagination of them. [3]
1 - Art Hobson, There are no particles, there are only fields, American Journal of Physics 81, 211 (2013); https://doi.org/10.1119/1.4789885
2 - Robert J. Sciamanda, THERE ARE NO PARTICLES, AND THERE ARE NO FIELDS, American Journal of Physics 81, 645 (2013); https://doi.org/10.1119/1.4812316
3 - Hossein Javadi's answer to What do you think of this statement, “There are no fields in nature, only particles. Fields are figments of theorist’s imaginations.”?
https://www.quora.com/What-do-you-think-of-this-statement-There-are-no-fields-in-nature-only-particles-Fields-are-figments-of-theorist-s-imaginations/answer/Hossein-Javadi-1?share=48e5085a&srid=F7rA
Dear Javadi, a particle is a small portion of matter. The word encompasses an enormous range of sizes: from subatomic particles, such as electrons, to particles large enough to be seen, such as particles of dust floating in sunlight. A particle is a minute quantity or fragment; a relatively small or the smallest discrete portion or amount of something . A particle is a small piece of anything. Particle can also refer to a subatomic particle with mass and structure, but takes up hardly any space at all.
Dear Emmanuel
You are right.
But note that you are broadening your visualization of the macroscopic world to microscopic.
On the subatomic level, energy is a dual entity consisting off photons and particles. Under certain circumstances the photon aspect of this mix can coalesce to particles, or matter. This happens when this dual mix is streaming through a double slit installation, but only when the process is being observed. When it is not directly observed the photons remain photons or light. This demonstrates that the existence of matter depends on consciousness. In short the existence of the world depends on the consciousness of the individual observer, Put another way,: the world is in essence no different from a dream. For more on this question read my "Vita Somnium Breve".
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