An assessment of Evans’ unified field theory II
نویسندگان
چکیده
Evans developed a classical unified field theory of gravitation and electromagnetism on the background of a spacetime obeying a Riemann-Cartan geometry. In an accompanying paper I, we analyzed this theory and summarized it in nine equations. We now propose a variational principle for Evans’ theory and show that it yields two field equations. The second field equation is algebraic in the torsion and we can resolve it with respect to the torsion. It turns out that for all physical cases the torsion vanishes and the first field equation, together with Evans’ unified field theory, collapses to an ordinary Einstein equation. PACS numbers: 03.50.Kk; 04.20.Jb; 04.50.+h
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2 00 8 An assessment of Evans ’ unified field theory
Evans developed a classical unified field theory of gravitation and electromagnetism on the background of a spacetime obeying a Riemann-Cartan geometry. This geometry can be characterized by an orthonormal coframe θ and a (metric compatible) Lorentz connection Γ . These two potentials yield the field strengths torsion T and curvature R . Evans tried to infuse electromagnetic properties into thi...
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