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C. Bejan, O. Kowalski (2015)
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Clifford algebras are used in theoretical physics and in particular, in the general theory of relativity, where Einstein’s equations are rewritten in Girard (Adv Appl Clifford Algebras 9(2):225–230, 1999) within a Clifford algebra. Let M be a manifold with a torsion-free connection which induces on its cotangent bundle $$T^{*}M$$ T ∗ M , a semi-Riemannian metric $$\bar{g}$$ g ¯ , called the natural Riemann extension, Kowalski and Sekizawa (Publ Math Debrecen 78:709–721, 2011). The main result of the present paper gives a necessary and sufficient condition for $$\bar{g}$$ g ¯ restricted to certain hypersurfaces of $$T^{*}M$$ T ∗ M to be Einstein.
Advances in Applied Clifford Algebras – Springer Journals
Published: Mar 21, 2017
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