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- W4385877673 abstract "Three theoretical criteria for gravitational theories beyond general relativity are considered: obtaining the cosmological constant as an integration constant, deriving the energy conservation law as a consequence of the field equations, rather than assuming it, and not necessarily considering conformally flat metrics as vacuum solutions. Existing theories, including general relativity, do not simultaneously fulfill all three criteria. To address this, a new gravitational field equation is proposed that satisfies these criteria. From this equation, a spherically symmetric exact solution is derived, which is a generalization of the Schwarzschild solution. It incorporates three terms: the Schwarzschild term, the de Sitter term, and a newly discovered term, which is proportional to ${r}^{4}$ in a radial coordinate, that becomes significant only at large distances. The equation is further applied to cosmology, deriving an equation for the scale factor. It then presents a solution that describes the transition from decelerating to accelerating expansion in a matter-dominated universe. This is achieved without the need for negative pressure as dark energy or the positive cosmological constant. This provides a novel explanation for the current accelerating expansion of the universe." @default.
- W4385877673 created "2023-08-17" @default.
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- W4385877673 date "2023-08-16" @default.
- W4385877673 modified "2023-09-23" @default.
- W4385877673 title "Gravity at cosmological distances: Explaining the accelerating expansion without dark energy" @default.
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- W4385877673 doi "https://doi.org/10.1103/physrevd.108.044031" @default.
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