Physics Asked on April 26, 2021
In Riemann geometry one can formally solve the parallel transport equation
$$ dot{v}^mu + Gamma^mu_{rhosigma} , u^rho , v^sigma = 0 $$
of a vector $v$ along a curve with unit tangent vector $u^mu = dot{x}^mu$ using the path-ordered exponential
$$ P^mu_nu(s,0) = left( text{P exp} – int_0^s ds , Gamma , u right)^mu_nu $$
$$ v^mu(s) = P^mu_nu(s,0) , v^nu(0) $$
Suppose we have
$$ langle v(s), w(s) rangle = langle P(s,0) , v(0), P(s,0) , w(0) rangle $$
with
$$ langle v, w rangle = g_{munu} , v^mu , w^nu $$
Question: can one show that the path-ordered exponentials cancel?
$$ langle v(s), w(s) rangle = langle v(0), w(0) rangle $$
The answer ist „yes“.
https://www.astro.caltech.edu/~george/ay21/readings/carroll-gr-textbook.pdf
Lecture Notes on General Relativity
Sean M. Carroll, Institute for Theoretical Physics
Chapter 3. Curvature
Correct answer by TomS on April 26, 2021
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