University | National University of Singapore (NUS) |
Subject | PC4274A: Mathematical Methods in Physics III Assignment |
PC4274A: Mathematical Methods in Physics III Assignment, NUS, Singapore: The Schwarzschild metric for the static field of a non-rotating spherically symmetric
1. [20 pts] The Schwarzschild metric for the static field of a non-rotating spherically symmetric black hole of mass M is given by
where t is the time coordinate, (r, θ, φ) are spherical-like coordinates, G is Newton’s gravitational constant and c is the speed of light. The path of a small test particle in this field can be described in term of proper time τ , i.e. (t(τ ), r(τ ), θ(τ ), φ(τ )).
(a) Considering only the motion confined to the so called equatorial plane θ(τ ) = π/2 and as- suming that the path of the small test particle is such as to make ds stationary, find two first integrals of the equations of motion.
(b) From their Newtonian limits, in which GM/r, ̇r2 and r2 ̇φ2 are all ≪ c2 where ̇r ≡ dr/dτ and ̇φ ≡ dφ/dτ , identify the constants of integration.
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(a) We seek to extremize the functional
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