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Presentation WEEK 8 PHIL.pptx

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Presentation WEEK 8 PHIL.pptx

  1. 1. “EINSTEIN’S GENERAL RELATIVITY PROVEN”
  2. 2. Introduction
  3. 3. MERCURY’S PRECESSION https://youtu.be/NXlg3nTqSnk
  4. 4. Mercury’s Precession A compelling piece of evidence for general relativity is the Mercurian orbit. Mercury, the closest planet to the sun, should revolve around it just like any other planet. The picture shows the expected orbit that Mercury should follow yet it doesn’t as we can see. In general relativity, this remaining precession, or change of orientation of the orbital ellipse within its orbital plane, is explained by gravitation being mediated by the curvature of space-time.
  5. 5. EXPANSION OF THE UNIVERSE In April 1931 report to the Prussian Academy of Sciences, Einstein finally adopted a model of an expanding universe. In 1932 he teamed up with the Dutch theoretical physicist and astronomer, Willem de Sitter, to propose an eternally expanding universe which became the cosmological model generally accepted until the middle of the 1990s.
  6. 6. Expansion of Space explained Albert Einstein stated in the “Special Theory of Relativity” that the laws of physics are the same for all observers, and the speed of light in a vacuum never changes regardless of the speed of the observers. As a result, Einstein found that space and time are not independent of each other but are intertwined space- time continuity. This theory suggests that the moment events occur for one observer may also occur at different moments for other observers. While working on the “General Theory of Relativity”, Einstein realized that giant objects cause distortions in the space-time fabric. You can compare it to a trampoline with a large weight on it. The weight placed on the trampoline will press down on the trampoline fabric and cause it to stretch.
  7. 7. General Lensing And Relativity HOW? The gravitational lensing experiments have provided conclusive proof that dark matter really does exist – in some form. However, it is still another form of indirect observation. According to NASA, the new cutting edge in astronomy builds on the observations of gravitational lensing by looking for new ways that dark matter might be observed directly, like gamma rays released by colliding dark matter particles. How Gravitational Lensing Proves the Existence of Dark Matter | Actforlibraries.org GRAVITATIONAL LENSING IN GENERAL RELATIVITY, IS THE PRESENCE OF MATTER (ENERGY DENSITY) THAT CAN CURVE SPACETIME, AND THE PATH OF A LIGHT RAYS WILL BE DEFLECTED AS A RESULT. THIS PROCESS IS CALLED GRAVITATIONAL LENSING AND, IN MANY CASES, CAN BE DESCRIBED IN ANALOGY TO THE DEFLECTION OF LIGHT BY (E.G., GLASS) LENSES IN OPTICS.
  8. 8. VIDEO ON RELITIVTY https://youtu.be/4e2plCS9Fn4 In this image, which is thought to be a black hole, distortions occurred in the galaxy image behind the black hole due to gravitational lensing. Credit: Hubble Space Telescope – NASA/ESA
  9. 9. Conclusion
  10. 10. Works Cited https://doi.org/10.1016/S0370-1573(00)00082-X Nola Taylor Tillman Meghan Bartels Scott Dutfield https://doi.org/10.1209/0295-5075/113/39001 https://doi.org/10.1088/0264- 9381/32/12/124002 https://doi.org/10.1142/S0218271816300044 Microsoft Word - Le Verrier3.doc (gsjournal.net)

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