Impact of transforming to Conformal Fermi Coordinates on Quasi-Single Field Non-Gaussianity

Understand

In general relativity predictions for observable quantities can be expressed in a coordinate independent way.

• Nonetheless it may be inconvenient to do so.
• Using a particular frame may be the easiest way to connect theoretical predictions to measurable quantities.
• For the cosmological curvature bispectrum such frame is described by the Conformal Fermi Coordinates.