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Lecture 8: Warped Space

Lecture 8: Warped Space. Einstein’s Theory of General Relativity (GR). The effects of gravity can be described in terms of curved space-time. Recall a car moving round a bend undergoes acceleration. Driver will feel a centrifugal force pushing him outwards. Similarly ….

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Lecture 8: Warped Space

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  1. Lecture 8: Warped Space

  2. Einstein’s Theory of General Relativity (GR) • The effects of gravity can be described in terms of curved space-time

  3. Recall a car moving round a bend undergoes acceleration Driver will feel a centrifugalforce pushing him outwards

  4. Similarly … • When space-time is curved, particles moving in it experience an acceleration • By the equivalence principle, we interpret these particles as being affected by the force of gravity

  5. General Relativity (cont’d) • Geometry of space-time is curved by matter in the space-time • On the other hand, the curvature of space-time determines how the matter will move

  6. Imagine Earth as a ball on a rubber sheet

  7. Experimental Tests of GR • Bending of light • Gravitational redshift • Precession of Mercury • Gravity waves

  8. Precession of Mercury • Mercury’s orbit is known to precess by 43 arcseconds per century • Newtonian gravity could not explain this, but GR is able to!

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