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General Relativity

Physics - 3rd Period

Taylor Gulley

on 19 November 2012

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Transcript of General Relativity

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli Relativity General What role does the equivalence of the inertial and gravitational properties of mass play in the development of general relativity? All experiments will give the same results in a local frame of reference in free fall and in a local frame of reference for removed from gravitational influences. How does gravity correspond to the bending of the space-time fabric? The fabric of space-time is bent all over the place because masses are in motion and carry gravitational weight. This gravitational force causes negative slopes where the universe bends around matter. What is the Schwarzschild radius? It is the limit at which matter can be compressed before a black hole is created. What are black holes, and are they real? Black holes are the regions of space having a gravitational field so intense that no matter or radiation can escape. What is gravitational lensing? The presence of matter can curve space-time, and the path of a light ray will be deflected as a result. Basically, it is the deflection of light by lenses in optics. What are worm holes? r =2GM/c 2 s How does gravity bend light? For most practical purposes, light moves in a straight line. However, it does bend a little due to gravity. The small curvature of light passing near the Sun was first observed in 1919. The agreement of that curvature with the prediction of General Relativity was the first big piece of evidence for General Relativity. However, the curvature near the Earth is much smaller even than near the Sun, because the Earth is very small compared to the Sun. Really big curvature of light by gravity occurs near the strange objects called black holes, which were also predicted by General Relativity. A wormhole is a pathway from one part of space and time to another more distant location. You might think of it as a shortcut through space that saves you from having to travel the normal distance between two points.
A worm hole is a mathematical solution to Einstein's relativistic equation for gravity in which two parts of space-time may be joined together. Unlike black holes, they have no singularities at least in the 'vacuum solution', but certain rotating 'Kerr-Nordstrom' black holes may serve the same worm hole-like function. Why is it called the general THEORY of relativity and not the general HYPOTHESIS of relativity? Theory Law Hypothesis a tentative assumption made in order to draw out and test its logical or empirical consequences Definition: a coherent group of tested general propositions, commonly regarded as correct, that can be used as principles of explanation and prediction for a class of phenomena Definition:

a statement of a relation or sequence of phenomena invariable under the same conditions. Definition: Sources:
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