Abstract
In this paper we give a Clifford bundle motivated approach to the wave equation of a free spin 1/2 fermion in the de Sitter manifold, a brane with topology \({M=\mathrm {S0}(4,1)/\mathrm {S0}(3,1)}\) living in the bulk spacetime \({{\mathbb{R}^{4,1}}=(\mathring{M}=\mathbb{R}^5,\boldsymbol{\mathring{g}})}\) and equipped with a metric field \({\boldsymbol{g}:\boldsymbol{=}-\boldsymbol{i}^{\ast} \boldsymbol{\mathring{g}}}\) with \({\boldsymbol{i}:M\rightarrow \mathring{M}}\) being the inclusion map. To obtain the analog of Dirac equation in Minkowski spacetime in the structure \({\mathring{M}}\) we appropriately factorize the two Casimir invariants C 1 and C 2 of the Lie algebra of the de Sitter group using the constraint given in the linearization of C 2 as input to linearize C 1. In this way we obtain an equation that we called DHESS1, which in previous studies by other authors was simply postulated. Next we derive a wave equation (called DHESS2) for a free spin 1/2 fermion in the de Sitter manifold using a heuristic argument which is an obvious generalization of a heuristic argument (described in detail in Appendix D) permitting a derivation of the Dirac equation in Minkowski spacetime and which shows that such famous equation express nothing more than the fact that the momentum of a free particle is a constant vector field over timelike integral curves of a given velocity field. It is a remarkable fact that DHESS1 and DHESS2 coincide. One of the main ingredients in our paper is the use of the concept of Dirac-Hestenes spinor fields. Appendices B and C recall this concept and its relation with covariant Dirac spinor fields usually used by physicists.
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Rodrigues, W.A., Wainer, S.A., Rivera-Tapia, M. et al. A Clifford Bundle Approach to the Wave Equation of a Spin 1/2 Fermion in the de Sitter Manifold. Adv. Appl. Clifford Algebras 26, 253–277 (2016). https://doi.org/10.1007/s00006-015-0588-z
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DOI: https://doi.org/10.1007/s00006-015-0588-z