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3 giorni fa · Special relativity is mathematically self-consistent, and it is an organic part of all modern physical theories, most notably quantum field theory, string theory, and general relativity (in the limiting case of negligible gravitational fields).
1 giorno fa · In astronomy, dark matter is a hypothetical form of matter that appears not to interact with light or the electromagnetic field. Dark matter is implied by gravitational effects which cannot be explained by general relativity unless more matter is present than can be seen.
2 giorni fa · In general relativity, however, there exists an innermost stable circular orbit (often called the ISCO), for which any infinitesimal inward perturbations to a circular orbit will lead to spiraling into the black hole, and any outward perturbations will, depending on the energy, result in spiraling in, stably orbiting between apastron and periastron, or escaping to infinity.
5 giorni fa · Gravitational waves are propagating disturbances in the curvature of spacetime, caused by some of the most violent and energetic physical processes in the universe. A common analogy in general relativity considers gravity to be caused by masses warping a rubber sheet; smaller masses …
4 giorni fa · Einstein's theory of relativity says that space and time are linked together. Credit: NASA/JPL-Caltech. What does this mean for time travel? Well, according to this theory, the faster you travel, the slower you experience time. Scientists have done some experiments to show that this is true.
3 giorni fa · Details of the structure of a black hole are calculated from Albert Einstein’s general theory of relativity. The singularity constitutes the centre of a black hole and is hidden by the object’s “surface,” the event horizon.
3 giorni fa · Credit: Wikipedia, CC ... Building on existing theories, my model offers an explanation using standard concepts from quantum theory and general relativity, without the need for elusive dark energy.
