Abstract
The two types of de Sitter gravities are constructed with the fiber bundle technique and some special cases are discussed. Relations among de Sitter, Poincare, and Lorentz gravity are discussed and the contraction from the de Sitter bundle to the Poincare bundle is demonstrated. Two types of gravitational gauge field equations are obtained by using the de Sitter-Poincare and de Sitter-Lorentz actions. The de Sitter effect occurring in the field equations is discussed.
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