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Homework Help: Finding Equation of Motion Using Scalar Field Lagrangian

  1. Apr 19, 2016 #1
    1. The problem statement, all variables and given/known data
    I must find the following equation of motion:

    φ'' + 3Hφ' + dV/dφ = 0

    Using the scalar field Lagrangian:

    EoM14.png (replace the -1/2m^2φ^2 term with a generic V(φ) term though)

    with the Euler-Lagrange Equation


    I know that I must assume φ = φ(t) and the scale factor a = a(t)

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Apr 24, 2016 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
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