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Fyzix
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Fyzix said:
marcus said:Irrelevant to presentday LQG. The results only concerns theories (I don't know which) that have been shown to be Lorentz violating. LQG has not been and is not in that class of theories.
suggests that the "grains" themselves must be much smaller - which is not necessarily the case. Instead the effects of these grains need to be much smaller. So if there is a theory which is compatible with Planck-space grains but w/o any violation or deformation of Lorentz invariance at all (like LQG) then this theory remains to be a perfectly valid candidate theory for quantum gravity.Science Daily said:It has shown that any underlying quantum 'graininess' of space must be at much smaller scales than previously predicted
String theory is a theoretical framework in physics that attempts to reconcile the theories of general relativity and quantum mechanics. It proposes that particles are not point-like objects, but instead are made up of tiny vibrating strings. Quantum grains, also known as Planck-scale structures, are the smallest possible units of space and time, and are predicted by string theory.
Both string theory and LQG are still actively being researched and developed. However, they both face challenges and open questions, and it is currently unclear which theory (if either) will ultimately be able to fully explain the nature of the universe at the quantum level.
Quantum grains are a key concept in both string theory and LQG, and they are believed to be the fundamental building blocks of the universe. By understanding the properties and behavior of quantum grains, scientists hope to gain a deeper understanding of the fundamental laws of nature and potentially unify the theories of general relativity and quantum mechanics.
At this time, there are no direct experimental tests that can definitively prove or disprove string theory or LQG. However, scientists are exploring ways to indirectly test these theories through observations of the universe and particle accelerators.
If either string theory or LQG is proven to be correct, it would have vast implications for our understanding of the universe. It could potentially lead to a unified theory of physics that could explain phenomena such as gravity, the behavior of subatomic particles, and the origin and evolution of the universe itself.