We study the geodesic deviation equation for a quantum particle in linearized gravitational field. Particle's Heisenberg equations of motion are treated as stochastic with noise. explore beyond its local approximation differential. discuss squeezed states resulting from an inflationary evolution. calculate noise thermal and states.

Many experiments have recently been proposed to test whether non-relativistic gravitational interactions can generate entanglement. In this note, I consider the extent which these if graviton exists. Assuming unitarity and Lorentz invariance of $S$-matrix, demonstrate that "Newtonian entanglement" requires existence massless bosons, universally coupled mass, in Hilbert space low-energy scatteri...

We characterize graviton non-Gaussianities in models of inflation where de Sitter boosts are spontaneously broken. discuss which the symmetry breaking patterns studied Nicolis et al., 2015 can sustain a period quasi expansion, and show that pattern Solid Inflation allows most freedom for interactions. comment on phenomenological consequences some these As byproduct this analysis we construct "E...

A bstract We find the set of generalized symmetries associated with free graviton theory in four dimensions. These are generated by gauge invariant topological operators that violate Haag duality ring-like regions. As expected from general QFT grounds, we a “electric” and dual “magnetic” compute their algebra. To do so, describe using phase space gauge-invariant electric magnetic variables cons...