Aspects of Symmetry in de Sitter Space | 
pickI want to read this. I would check online course work, and YouTube for more info about this particular subject.
In mathematics and physics, a de Sitter space is the analog in Minkowski space, or spacetime, of a sphere in ordinary Euclidean space. The n-dimensional de Sitter space, denoted dSn, is the Lorentzian manifold analog of an n-sphere (with its canonical Riemannian metric)..
wikipedia.org/wiki/De_Sitter_space
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