Speaker
Nathan Belrhali
Description
The generation of primordial density inhomogeneities from the inflaton
quantum fluctuations is a crucial prediction of inflation. The correlation
functions of these quantum fluctuations, called cosmological correlators,
can be studied in a perturbative framework. These fluctuations can be
mathematically described as quantum massive fields that propagate in a de
Sitter space-time. However, this propagation has a complex time and
kinematic dependence due to broken Lorentz invariance.
In this talk, I will derive an integral transform that allows one to
express cosmological correlators in terms of their flat-space counterpart
with a suitable linear transform, and I will show how it simplifies their
dependence in kinematic variables.
Author
Nathan Belrhali