hw1 - usual Schwarzschild coordinates t r θ φ 3 The...

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Homework 1, Physics 776, Spring 2005 Due Tuesday Feb. 8, at the beginning of class. Painlev´ e-Gullstrand coordinates The line element for the unique spherically symmetric, vacuum solution to the Einstein equation can be written as ds 2 = dT 2 - ( dr + s 2 M r dT ) 2 - r 2 d Ω 2 Note that the 3-geometry of a surface of constant T is simply ﬂat Euclidean space! 1. Which value of r corresponds to the event horizon? Give a clear and precise explanation of your answer, using the properties of the metric extracted directly from the above expression (i.e. without reference to some other coordinate system, for example). 2. Find the coordinate transformation relating these coordinates to the
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Unformatted text preview: usual Schwarzschild coordinates ( t, r, θ, φ ). 3. The radial curves with dr =-q 2 M r dT are timelike and T is the proper time along these curves. Show that (a) these curves are geodesics which are asymptotically at rest at inﬁnity, and (b) they are orthogonal (in the sense of the spacetime metric) to the surfaces of constant T . 4. Draw a spacetime diagram of the ( r, T ) plane showing lines of constant r as vertical and lines of constant T as horizontal. Indicate (a) a radial geodesic dr =-q 2 M r dT , (b) the light cone at various values of r , and (c) a line of constant Schwarzschild time t . 1...
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