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2 results

  • 3 - Spacetime, Curvature and Gravity

  • Luciano Rezzolla, Goethe-Universität Frankfurt Am Main
  • Book:
    The Irresistible Attraction of Gravity
    Published online:
    02 March 2023
    Print publication:
    02 March 2023, pp 25-48

  • Summary

    The end result of Einstein’s revolutionary vision is that gravity is simply the manifestation of the curvature of spacetime. This is a concept that has a deep significance and is at the heart of the Einstein field equations. This Chapter will explain why we need to introduce the idea of 'spacetime' and how we can define the concept of spacetime curvature in this description. Starting from the example of a spacetime empty of matter – that is, a flat spacetime – we will move to the example of a spacetime containing matter and energy – that is, a curved spacetime. This chapter will explain why we find the description of gravity proposed by Newton very reasonable and why we have trouble appreciating the new vision proposed by Einstein. We will contrast the two descriptions with a simple example and show how the very same physical phenomenon – the orbit of the Earth around the Sun – can be seen with very different explanations by Newton and Einstein.

  • NASE Workshop: Eclipses and Gravitation Lenses

  • Rosa M. Ros, Beatriz García, Ricardo Moreno, Noorali T. Jiwaji, Mahdi Rokni
  • Journal:
    Proceedings of the International Astronomical Union / Volume 15 / Issue S367 / December 2019
    Published online by Cambridge University Press:
    23 December 2021, pp. 143-146
    Print publication:
    December 2019
    • Article
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  • Astronomy is connected with the every day experiences of the people, since the observation of simple and repetitive phenomena, as the succesion of days and nights, untill events of high impact, as the total solar eclipses. In this sense, the Astronomy is a fascinating activity and can be used to inspire interest in sciences in general. In this contribution, we introduce the Network of Astronmy School Education as part of the IAU proposals connected with teaching training programs, and we highlight several examples on the specific topic of the eclipses: their importance and connection with the culture, that can capture students attention if we use the workshops as part of the classes.