An Exceptionally Simple Theory of Everything | Wikipedia audio article
Channel: wikipedia tts
Date: 29/12/2018

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/An_Exceptionally_Simple_Theory_of_Everything


00:04:51 1 Overview
00:09:25 2 Technical overview
00:09:37 3 Chronology and reaction
00:18:01 4 References
00:19:46 5 External links
00:19:57 The fundamental geometric idea of E8 Theory is that our universe and its contents exists as quantum excitations of the largest simple real quaternionic exceptional Lie group, E8(−24). This is described via an extension of Cartan geometry employing a superconnection. The relevant Cartan geometry is modeled on Klein geometry, beginning with a homogeneous space, G/H, in which the initial Lie group is G
00:20:39 SL(2,C)xS(U(3)×U(2))xZ3, in which Z3
00:21:58 dC + CC
00:22:26 W + E + Ψover spacetime, M (a subspace of B), in which, Ψ, a Lie(G/H) valued 1-form over B assumed to be orthogonal to M, is interpreted as a set of three fermionic (Grassmann number) fields over M, valued in Lie(G/H), related by triality, T. According to Lisi, the description of Grassmann number fermions as 1-forms orthogonal to spacetime, valued in a spinor representation, provides a clear geometric understanding of what fermions are. In E8 Theory, the H-connection is physically the gravitational spin connection, ½ω, plus the Standard Model and X boson gauge fields, H
00:24:10 dG + GG
00:24:31 dω + ½ωω is the gravitational Riemann curvature 2-form, FH
00:24:52 de + ½ωe + ½eω is the gravitational torsion, DΦ
00:25:43 0, there is no excitation of the Lie group, G, and the Higgs field has a vacuum expectation value, Φ=Φ0, corresponding to a positive cosmological constant, Λ
00:29:11 Chronology and reaction



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SUMMARY
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"An Exceptionally Simple Theory of Everything" is a physics preprint proposing a basis for a unified field theory, often referred to as "E8 Theory", which attempts to describe all known fundamental interactions in physics and to stand as a possible theory of everything. The paper was posted to the physics arXiv by Antony Garrett Lisi on November 6, 2007, and was not submitted to a peer-reviewed scientific journal. The title is a pun on the algebra used, the Lie algebra of the largest "simple", "exceptional" Lie group, E8. The paper's goal is to describe how the combined structure and dynamics of all gravitational and Standard Model particle fields, including fermions, are part of the E8 Lie algebra.The theory is presented as an extension of the grand unified theory program, incorporating gravity and fermions. In the paper, Lisi states that all three generations of fermions do not directly embed in E8 with correct quantum numbers and spins, but that they must be described via a triality transformation, noting that the theory is incomplete and that a correct description of the relationship between triality and generations, if it exists, awaits a better understanding.
The theory received accolades from a few physicists amid a flurry of media coverage, but also met with widespread skepticism. Scientific American reported in March 2008 that the theory was being "largely but not entirely ignored" by the mainstream physics community, with a few physicists picking up the work to develop it further. In a follow-up paper, Lee Smolin proposed a spontaneous symmetry breaking mechanism for obtaining the classical action in Lisi's model, and speculated on the path to its quantization. In July 2009, Jacques Distler and Skip Garibaldi published a critical paper in Communications in Mathematical Physics called "There is no 'Theory of Everything' inside E8", arguing that Lisi's theory, and a large class of related models, cannot work. They offer a direct proof that it is impossible to embed all three generations of fermions in E8, or to obtain even the one-generation Standard Model without the presence of an antigeneration. In response  ...