Affine symmetry, geodesics, and homogeneous spacetimes
Affine symmetry, geodesics, and homogeneous spacetimes
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仿射对称、测地线和齐次时空
DOI:
10.1007/s10714-018-2422-0
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发表时间:
2018
影响因子:
2.8
通讯作者:
Torre, Charles
中科院分区:
文献类型:
--
作者:
Maughan, David;Torre, Charles
We show that the conservation laws for the geodesic equation which are associated to affine symmetries can be obtained from symmetries of the Lagrangian for affinely parametrized geodesics according to Noether’s theorem, in contrast to claims found in the literature. In particular, using Aminova’s classification of affine motions of Lorentzian manifolds, we show in detail how affine motions define generalized symmetries of the geodesic Lagrangian. We compute all infinitesimal proper affine symmetries and the corresponding geodesic conservation laws for all homogeneous solutions to the Einstein field equations in four spacetime dimensions with each of the following energy–momentum contents: vacuum, cosmological constant, perfect fluid, pure radiation, and homogeneous electromagnetic fields.
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