User:Aardvark/GU: Difference between revisions

The '''Theory of Geometric Unity''' is an attempt by Eric Weinstein to produce a unified field theory by recovering the different, seemingly incompatible geometries of fundamental physics from a general structure with minimal assumptions. The theory comes in four versions, each generated from a construction called the [[Observerse|observerse]], a replacement for Einstein's spacetime. For the latest updates on the theory, visit '''[https://geometricunity.org/ geometricunity.org]'''.

Geometric Unity is hoped to provide a way out of the [[Twin Nuclei Problem]].

Eric says he first began developing the theory in the mid to late 1980s while he was a PhD student at Harvard University.

== First Presentation ==

Geometric Unity was [[A Portal Special Presentation- Geometric Unity: A First Look|first presented]] in three Simonyi Special Lectures delivered over the course of a week at the University of Oxford. The lectures were organized by Marcus du Sautoy, the Simonyi Professor for the Public Understanding of Science. The lectures provided a broad overview of the mathematical structures in the theory’s endogenous version, discussed where current effective theories are recovered in those structures, and showed general predictions based on those structures.

"[[A Portal Special Presentation- Geometric Unity: A First Look|A Portal Special Presentation- Geometric Unity: A First Look]]" was uploaded on April 2nd, 2020 as a general introduction to Geometric Unity. The video is divided into three sections: a preface, the lecture proper, and a supplementary PowerPoint presentation. The preface provides context based on historical and contemporary events and introduces the concept of a theory of everything. The lecture shown is a recording of the first lecture given at the University of Oxford. The PowerPoint reviews the lecture’s major concepts in a more up-to-date notation.

* From Einstein's general relativity, we take the Einstein projection of the curvature tensor of the Levi-Civita connection $$\nabla$$ of the metric $$P_E(F_{\nabla})$$

* From Yang-Mills-Maxwell-Anderson-Higgs theory of gauge fields, we take the adjoint exterior derivative coupled to a connection $$d^\star_A F_A$$

'''Idea:''' What if the $$F$$'s are the same in both contexts?

Further, supposing these $$F$$'s are the same, then why apply two different operators?  

A problem is that the hallmark of the Yang-Mills theory is the freedom to choose the data, the internal quantum numbers that give all the particles their personalities beyond the mass and the spin. We can allow the gauge group of symmetries to act on both sides of the equation, but the key problem is that: $$P_E(F_{\nabla h}) \neq  h^{-1} P_E(F_{\nabla}) h $$. If we act on connections on the right and then take the Einstein projection, this is not equal to first taking the projection and then conjugating with the gauge action. The gauge rotation is only acting on one of the two factors. Yet the projection is making use of both of them. So there is a fundamental incompatibility in the claim that Einstein's theory is a gauge theory relies more on analogy than an exact mapping between the two theories.

"So if we're going to take the spin-2 $$G_{\mu\nu}$$ field to be quantum mechanical, if it blinks out and does whatever the quantum does between observations. In the case of the photon, it is saying that the waves may blink out, but the ocean need not blink out. In the case of the Dirac theory, it is the ocean, the medium, in which the waves live that becomes uncertain itself. So even if you're comfortable with the quantum, to me, this becomes a bridge too far. So the question is: "How do we liberate the definition?"