I may not know what gravity is, but everyone knows what it does. I don't know what the various theories of particle physics are and how they are trying to unify them with gravity. I speculated before that gravity exists between atoms, meaning that it exists after the atom is formed meaning there is no unification of the forces in an atom and gravity.
One must admit that such an observation is important. For one, it is inconsistant with the big bang interpretation insofar as the big bang embraces particle theory. And there may be a clue as to what gravity is made of - how does it operate - if it operataes inbetween particles.
And then this came in, well, ok, I was listening in to the Lion's Den.
<blockquote id="quote"><font size="2" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Einstein gravity as an emergent phenomenon?
Carlos Barcelo and Matt Visser & Stefano Liberati
E-mail: carlos@hbar.wustl.eduE-mail:
visser@kiwi.wustl.edu
E-mail: liberati@physics.umd.edu
Homepage:
www.physics.wustl.edu/˜carlos
Homepage:
www.physics.wustl.edu/˜visser
Homepage:
www2.physics.umd.edu/˜liberati
Abstract
“In this essay we marshal evidence suggesting that Einstein gravity may be an emergent phenomenon, one that is not “fundamental” but rather is an almost automatic low-energy long-distance consequence of a wide class of theories. Specifically, the emergence of a curved spacetime “effctive Lorentzian geometry” is a common generic result of linearizing a classical scalar ?eld theory around some non-trivial background. This explains why so many different “analog models” of general relativity have recently been developed based on condensed matter physics; there is something more fundamental going on. Upon quantizing the linearized fuctuations around this background geometry, the one-loop effective action is guaranteed to contain a term proportional to the Einstein–Hilbert action of general relativity, suggesting that while classical physics is responsible for generating an “effective geometry”, quantum physics can be argued to induce an “effective dynamics”. This physical picture suggests that Einstein gravity is an emergent low-energy long-distance phenomenon that is
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
So what does this mean? Look at the key words -
"emergence"
"not fundamental"
"effective dynamics."
"insensitive to the details of the high-energy short-distance physics."
I think they are saying that gravity is an emergent property of the relationship between masses. And as pointed out by Paul Marmet also, it comes AFTER the masses have formed.
I wonder exactly which masses are affected by gravity? Because we can easily group all atoms together. IF we do that, then aren't we talking about electron fields? Matter, then, made of atoms which are made of electron fields, as a group is affected by gravity. Setting sub-atomic matter aside for now, it appears that gravity is some sot of attraction between electron fields. In other words it is electromagnetic?
Light, the photon, is affected by gravity. Or so Eddington said. But what about the EMF of a galaxy? How is a photon of light affected by
magnetic fields? Maybe Eddington's photons were bent around a star not because of gravity, but because of the electromagnetic fields which ALSO exist in and around a galaxy?
