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- https://phys.libretexts.org/Courses/Prince_Georges_Community_College/General_Physics_I%3A_Classical_Mechanics/54%3A_Gravity/54.08%3A_General_RelativityThis was an important early test of general relativity: the amount of light bending predicted by general relativity was confirmed by measuring the positions of stars near the Sun during a solar eclips...This was an important early test of general relativity: the amount of light bending predicted by general relativity was confirmed by measuring the positions of stars near the Sun during a solar eclipse in 1919. This effect has been observed recently by the Hubble Space Telescope in the form of gravitational lensing: the gravity of a relatively nearby galaxy will bend the light from more distant objects, producing multiple images of the distant object.
- https://phys.libretexts.org/Learning_Objects/A_Physics_Formulary/Physics/03%3A_RelativityGeneral and special relativity starting from the Lorentz transform to Black holes
- https://phys.libretexts.org/Bookshelves/Relativity/General_Relativity_(Crowell)/05%3A_Curvature/5.03%3A_The_Stress-energy_TensorIn general, the curvature of spacetime will contain contributions from both tidal forces and local sources, superimposed on one another. To develop the right formulation for the Einstein field equatio...In general, the curvature of spacetime will contain contributions from both tidal forces and local sources, superimposed on one another. To develop the right formulation for the Einstein field equations, we need to eliminate the tidal part. Roughly speaking, we will do this by averaging the sectional curvature over all three of the planes t−x, t−y, and t−z, giving a measure of curvature called the Ricci curvature.
- https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Introductory_Physics_II_(1112)/zz%3A_Back_Matter/10%3A_13.1%3A_Appendix_J-_Physics_Formulas_(Wevers)/1.03%3A_RelativityGeneral and special relativity starting from the Lorentz transform to Black holes
- https://phys.libretexts.org/Bookshelves/Relativity/Special_Relativity_(Crowell)/09%3A_Flux/9.02%3A_The_Stress-Energy_TensorA particle such as an electron has a charge, but it also has a mass. We can’t define a relativistic mass flux because flux is defined by addition, but mass isn’t additive in relativity. Mass-energy is...A particle such as an electron has a charge, but it also has a mass. We can’t define a relativistic mass flux because flux is defined by addition, but mass isn’t additive in relativity. Mass-energy is additive, but unlike charge it isn’t an invariant. Mass-energy is part of the energy-momentum four vector. We then have sixteen different fluxes we can define.