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 the 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. Write My Assignment Hire a Professional Essay & Assignment Writer for completing your Academic Assessments Native Singapore Writers Team 100% Plagiarism-Free Essay Highest Satisfaction Rate Free Revision On-Time Delivery 2. [30 pts] (a) We seek to extremize the functional with respect to functions which attain the value u 1 for x = x 1 and which satisfy the given relation g ( x, u ) = 0 at the upper limit of integration, as yet undetermined. Show that the stationary function u ( x ) satisfies the Euler equation and, in addition to the left-hand end-point requirement u ( x 1 ) = u 1 , the right-hand end-point condition (b) Find the shortest distance between the line f ( x ) = x − 3 and the curve g ( x ) = e x . Also, identify the point on respective curves giving the shortest distance. Buy Custom Answer of This Assessment & Raise Your Grades Get A Free Quote
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