The possibility that inertia could be an emergent phenomena derived from gravity, and that gravity itself might even be an emergent phenomena from quantum physics and thermodynamics, is seductive but elusive.
The question of where the inertial properties of matter come from has been open for a long time. Isaac Newton considered inertia an intrinsic property of matter. Ernst Mach held a different view whereby the inertia of a body comes from its interaction with the rest of the universe. This idea is known today as Mach's principle. We discuss Mach's principle based on transactional gravity, the recently developed completion of the entropic gravity program by the physics of quantum events induced by transactions. A consequence of the analysis is a fundamental relation between the gravitational constant G and the total mass in the causal universe, derived by means of entropic principles.
A. Schlatter, R. E. Kastner, "A Note on the Origin of Inertia" arXiv:2402.09365 (February 14, 2024).
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Monday, February 12, 2024
Singularities might be everywhere -- and they might make up dark matter
Ok, I have seen a lot of weird ideas for what dark matter could be, but this one surprised even me. A team of researchers proposes that the universe might be filled with singularities, or more precisely "primordial naked singularities," and those could make up what we call dark matter. I had a look at the paper, because if nothing else, it's a fun idea.
http://backreaction.blogspot.com/2024/02/singularities-might-be-everywhere-and.html
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