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General Relativity

Headings: - Principle of Equivalence - Advance of Mercury's Perihelion - Advance of Mercury's Perihelion - Gravitational Deflection of Light - Light Deflection and Space-time Curvature - Eddington's Measurement of Light Deflection Content: Einstein's calculations in his newly developed general relativity indicated that the light from a star which just grazed the sun should be deflected by 1.75 seconds of arc. The depiction of this bending is greatly exaggerated in the illustration above.

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收录于

2026年3月18日

学科与领域

physics · modern-physics-relativity

年级范围

十一年级（高三）–十二年级（高四）

页面类型

Article

简介

Key Concepts in General Relativity

  • Principle of Equivalence: Experiments in a uniformly accelerating frame are indistinguishable from those in a gravitational field. This implies that gravitational mass is equivalent to inertial mass.
  • Space-time Curvature: Rather than just "effective mass," Einstein proposed that mass causes a curvature in space-time. Light follows the shortest path (geodesic) through this curved space.
  • Gravitational Effects on Light:
    • Deflection: Gravity bends the path of light.
    • Gravitational Redshift: Light is impeded when escaping a gravitational field, causing a shift in frequency.
    • Gravitational Lensing: Massive objects can act as lenses, bending light from distant sources.
    • Einstein Rings: A specific lensing effect where a distant object is perfectly aligned behind a massive foreground object, creating a circle of light.
    • Black Holes: Predicted as a consequence of light being unable to escape intense gravitational fields.
  • Historical Validation (1919 Eclipse):
    • Einstein predicted that starlight grazing the Sun would be deflected by 1.75 seconds of arc.
    • Arthur S. Eddington led an expedition to Principe and Sobral on May 29, 1919, to measure this during a total solar eclipse.
    • The results confirmed Einstein's prediction with approximately 20% accuracy.
  • Visualization: The "elastic sheet" analogy is commonly used to visualize 4D space-time curvature, though it is an oversimplification.
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