Miguel Zilhao - 2019-03-18

Jean Muchel Sellier - 2019-02-04

Conformal Horizon Fluctuations in de Sitter Space, Dynamical Dark Energy & the CMB

Infrared sensitivity of the de Sitter decay rate due to particle creation requires that gravitational backreaction be taken into account on the horizon scale. At lowest order, backreaction can be studied by Linear Response of the geometry to quantum matter perturbations around the Bunch-Davies state. In Linear Response the scalar degree of freedom derived from the conformal anomaly gives rise to scalar gravitational waves that grow without bound on the de Sitter horizon scale,  which implies substantial non-linear quantum backreaction effects in cosmology.

Dom Pesce - 2019-01-13

Robert Sims - 2019-01-27

Thomas Mertens - 2019-04-15

Archisman Ghosh - 2019-01-08

Ruth Gregory - 2019-01-08

Monica Kang - 2019-02-17