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2013

Fossilized Gravitational Wave Relic and Primordial Clocks

Brahma, Suddhasattwa, Nelson, Elliot, Shandera, Sarah

Understand

If long wavelength primordial tensor modes are coupled to short wavelength scalar modes, the scalar curvature two-point function will have an off-diagonal component.

This `fossil' remnant is a signature of a mode coupling that cannot be achieved in single clock inflation.
Any constraint on its presence allows a cross check of the relationship between the dynamical generation of the fluctuations and the evolution of the inflationary background.
We use the example of non-Bunch Davies initial states for the tensor and scalar modes to demonstrate that physically reasonable fossils, consistent with current data, can be observable in the near future.