Speaker
Description
Cosmological perturbation theory often serves as a tool to construct effective field theories (EFTs) for gravity and matter, describing a wide range of observed phenomena across different cosmological epochs. Within the asymptotic safety scenario for quantum gravity, the effective dynamics of quantum fluctuations around cosmological backgrounds can be derived from a UV-completion, offering a top-down perspective on cosmological effective descriptions. In practice, the Functional Renormalization Group provides the computational machinery to achieve this. Following previous Asymptotic Safety studies for foliated spacetimes, we investigate a new computational framework employing curved backgrounds and truncations inspired by cosmological perturbation theory.