- #1
Replusz
- 142
- 14
- TL;DR Summary
- Question is in the title, some context:
https://arxiv.org/pdf/1504.08040.pdf It is in the abstract here.
This is on page 2, and I guess it is the key to understanding what they mean by linearized perturbation to a BH in the abstract.
What is meant by gravitational fields, what is delta(g_ab) and delta\Phi ? A perturbation to the metric, and the 'gravitational field', sure. And where are these added? Not in the action/lagrangian right? Just simply take g_ab of a black hole e.g. Schwarzschild and add delta g_ab to everywhere it comes up? What about Phi, what is Phi in general relativity?
Thanks!