Gravity has been suggested to be a force by convention, real but not fundamental, although this has not been established in peer review publications (or has been atemptented and rejected) . Many arguments towards this exist and the idea invalidates many paradoxes (Afxentiou, 22).
Serious objections remain such as the role of gravity in evolution of universe (evolution from plasma to clusters is explained by gravity), for which evidence has been found (opaque spectrum of far universe etc).
Holographic principle assumes that fundamental reality and all its information is in 2D and project Ed to 3D, might be an expression of this force by convention nature of gravity.
The reason is that in a Holographic projection of "real" 2D to 3D, gravity, the dominant force, needs not be anything more than an effective force, since a hiligram works just in information or digital physics, not fundamentally real actions.
Conventional forces have been established as effective, in a way that has analoque to the resultant force concept in CM is effective (Afxentiou, '22)
Gravity is a conventional force: It's a conservative force in the non-relativistic approximation. It is also a force beyond the non-relativistic approximation, where the gravitational force is described by the exchange of massless, spin-2, particles, that describe the spacetime metric; just like the other known forces describe the exchange of spin-1 particles for the strong, electromagnetic and weak interactions and the exchange of a spin-0 particle for the force mediated by the Higgs.
This is sufficient for describing all properties of gravity, as long as one is studying the solutions of its equations of motion. The problems arise when trying to study the quantum properties of spacetime, that are relevant for understanding the early universe ; or quantum matter that probes black holes. The reason is that classical gravity is a gauge theory-like the theories of the other interactions (save that of the Higgs, that isn't a gauge interaction)-but its gauge group, that of the diffeomorphisms-is noncompact. This is the fundamental difference between gravity and the other interactions. That's the difference between understanding classical gravity as the limit of a conventional quantum gauge theory and understanding the other interactions as limits of a conventional quantum gauge theory. It is also the reason for the appearance of spacetime singularities, whose resolution isn't yet understood.
The holographic hypothesis implies a correspondence between gravity and a particular class of field theories on the boundary of spacetime. This is a classical/quantum (or ``weak/strong coupling'') correspondence and
this is sufficient for describing certain properties of quantum gravity-namely the microstates, whose classical limit can be identified with a certain class of black holes as probed by quantum matter-but not, yet, everything about quantum gravity. It has proved very useful in establishing correspondences between problems in strongly coupled
quantum field theories in flat spacetime and problems in classical gravity.
Hello Μr Nicolis,
I a "conceptual Reversal", Gravity has been proposed by Eric Verlinden to be non fundamental in the lines of my definition of conventional force.
These results are strong my related to the AdS/CFT principle proposed by Juan Maldacena.
The fuss about gravity being on entropy and holographic arguments support the "conventional force nature"- the evolution al possibility that gravity might not be a fundamental force but emergent phenomenon,reformulating physics in a way that information is the fundamention of physics and that laws governing it can be derive from that foundation
Mr Nicolis, although gravity has been postulated to be a fundamental spin-2 force and this Particle has organically been derived by string arguments, no such Particle has been found, placing doubts on the theory.
What I call conventional is "not fundamental", our meanings might not coincide thus are disagreements might not be real.
Regards
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