Theory2021 GW
From IFPA wiki
- What are the two ways to derive the wave equation from the Einstein equations? How does gauge fixing come in?
- What is the TT gauge? What are the solutions for gravitational waves in that gauge? What are their main properties?
- What are the main properties of gravitational waves in an expanding universe? How does the expansion affect the wave equation? What are the potential consequences?
- Give the expression of the gravitational wave far away from a source as a function of the leading multipole moment of the source. Explain why the lower-order multipoles do not contribute.
- What steps are necessary to derive the expression of the chirp mass and of the waveform during an inspiral at the leading order in [math]\displaystyle{ v/c }[/math]?
- What is the effect of a gravitational wave on a Michelson interferometer? Discuss the situation in the TT gauge and in the proper frame of the detector.