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An Invitation to Astrophysics (World Scientific Series in by Thanu Padmanabhan

By Thanu Padmanabhan

This detailed e-book offers a transparent and lucid description of a number of facets of astrophysics and cosmology in a language comprehensible to a physicist or newbie in astrophysics. It provides the foremost themes in all branches of astrophysics and cosmology in an easy and concise language. The emphasis is on at the moment lively study components and intriguing new frontiers instead of on extra pedantic subject matters. Many advanced effects are brought with basic, novel derivations which boost the conceptual knowing of the topic. The ebook additionally comprises over 100 workouts as a way to support scholars of their self examine. Undergraduate and graduate scholars in physics and astrophysics in addition to all physicists who're attracted to acquiring a short snatch of astrophysical thoughts will locate this ebook invaluable.

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Additional resources for An Invitation to Astrophysics (World Scientific Series in Astronomy and Astrophysic)

Sample text

In fact study of fossilized corals show that the length of the month was shorter in the past; earth has indeed slowed down and moon has moved away. You can see that, eventually, earth will rotate once in its axis exactly in the time it takes for moon to complete one orbit around earth. Also, since circular orbits have the lowest energy for a given angular momentum, this process also leads to the circularisation of orbits. The final length of the day resulting from the tidal interaction (which will be the same as the final orbital period of Moon) can be easily estimated from the conservation of angular momentum.

Such a metric could still describe the geometry around, say, Sun. 6 Gravitational lensing Another key feature of general relativity is that it affects the trajectory of light rays. Once again, the basic idea can be understood from the equivalence principle. Consider a cubical box of size I which is being accelerated upwards with an acceleration g. Let a light source on one wall of the box emit a pulse of light towards the opposite wall. It will take a time of about t « l/c to reach the opposite wall during which time the wall would have moved up by an amount x = (l/2)gt2 = (l/2)(gl2/c2).

If, for example, a compact object in our galaxy (say a Jupiter like non luminous object) moves across the line of Chapter 1: Gravitation 39 sight to a distant star in, say, the Large Magellanic Cloud (LMC, which is a small satellite galaxy of Milky Way), it will lead to a magnification of the light from the star under optimal conditions. The peak magnification in Eq. 34 which should be easily detectable. This is an indirect way of detecting massive, compact halo objects (called MACHOS) in the halo of our galaxy.

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