Tag: Einstein Field Equations
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Mach’s Principle
Introduction Mach’s Principle, named after the physicist Ernst Mach, is a postulate that discusses the relationship between the distribution of matter in the universe and the local behavior of an inertial frame. Mach’s Principle has had a significant influence on the development of general relativity and cosmology, even though it is not precisely defined. Basic…
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De Sitter Universe
Introduction The de Sitter universe is a solution to Einstein’s field equations of general relativity, representing a cosmological model. Named after the Dutch astronomer Willem de Sitter, it describes an empty universe with a positive cosmological constant, implying a constant positive curvature of space. This universe exhibits exponential expansion, a concept that is key to…
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General Relativity
Introduction General Relativity is a theory of gravitation that was developed by Albert Einstein between 1907 and 1915. Based on his idea of what he called “The Equivalence Principle,” he proposed that gravity is not a force in the traditional sense, but a curvature in spacetime caused by mass and energy. The Field Equations The…
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Einstein Field Equations
Introduction The Einstein field equations (EFE) are the cornerstone of Einstein’s theory of general relativity. They describe the fundamental interaction of gravitation as a result of spacetime being curved by matter and energy. They were first published by Einstein in 1915. The Equation The Einstein field equations can be written as: Here is the Einstein…