1. Of what type is Poisson’s equation uxx + uyy = f(x,y) ? I used that if you have auxx+buxy+cuyy+dux+euy +fu+g=0 where a, b, c, d, e, f, g is...
Einstein's field equation in the weak curvature limit appropriate for the aging universe has the Newtonian Poisson equation limit Gµν + Λgµν = 8πTµν → ∇2V (w) = 4πGρ(1 + 3w) (1.4) For the special case of radiation we get the famous factor of 2 for the ...