21 Übersetzungen
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- The Ehlers–Geren–Sachs theorem, published in 1968, shows that in a given universe, if all freely falling observers measure the cosmic background radiation to have exactly the same properties in all directions (that is, they measure the background radiation to be isotropic), then that universe is an isotropic and homogeneous Friedmann–Lemaître spacetime.
- They represent the motion of freely falling particles which start out with zero velocity at infinity.
- World lines of freely falling particles/objects are called geodesics. In special relativity these are straight lines in Minkowski space.
- It is thought that Galileo derived his initial theory of the speed of a freely falling body from his reading of Benedetti's works.
- Fokker made several contributions to special relativity, and some less well-known contributions to general relativity, particularly in the area of geodetic precession, the phenomena of precession of a freely falling gyroscope in a gravitational field.
- The basic configuration is that of a drag-free satellite where an outer shell around an inner test mass is used to block solar wind, atmospheric drag, the Earth's magnetic field and other effects which might disturb the motion of a freely-falling inner object.
- When constructing his general theory of relativity, Einstein made the following observation: a freely falling object in a gravitational field will not be able to detect the existence of the field by making local measurements ("a falling man feels no gravity").
- Because "local Lorentz invariance" (LLI) also holds in freely falling frames, experiments concerning the weak Equivalence principle belong to this class of tests as well.
- But a freely falling reference frame on one side of the Earth cannot explain why the people on the opposite side of the Earth experience a gravitational pull in the opposite direction.
- Polnarev, suggested the existence of a gravitational memory effect, for which a system of freely falling particles initially at relative rest are displaced after the passing of a burst of gravitational radiation.
- A "free body" should also be distinguished from a "freely falling body".
- Doran derived a coordinate system for a rotating (Kerr) black hole suited to freely-falling observers, analogous to Gullstrand–Painlevé coordinates for the non-rotating case (Schwarzschild spacetime).
- According to general relativity, in its weak-field and slow-motion linearized approximation, a slowly spinning body induces an additional component of the gravitational field that acts on a freely-falling test particle with a non-central, gravitomagnetic Lorentz-like force.
- An accelerometer at rest relative to the Earth's surface will indicate approximately 1 g "upwards" because the Earth's surface exerts a normal force upwards relative to the local inertial frame (the frame of a freely falling object near the surface).
- The acceleration of an object free falling towards the earth depends on the reference frame (it disappears in the free-fall frame, also called the inertial frame), but any g-force "acceleration" will be present in all frames.
© dict.cc English-German dictionary 2024
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