Abstract The Sachdev–Ye–Kitaev model and two-dimensional dilaton gravity have recently
been attracting increasing attention of the high-energy and condensed-matter physics …

We show how to compute the purity and entanglement entropy for quantum fields in a
systematic perturbative expansion. To that end, we generalize the in-in formalism to non …

A bstract Though simple inflationary models describe the CMB well, their corrections are
often plagued by infrared effects that obstruct a reliable calculation of late-time behaviour …

We discuss equilibration process in expanding Universes as compared to the thermalization
process in Minkowski spacetime. The final goal is to answer the following question: Is the …

There are at least three different types of secular effects in the two-point correlation functions
in scalar quantum field theories in de Sitter space-time. The first one is specific to de Sitter …

The generalized uncertainty relation is expected to be an essential element in a theory of
quantum gravity. In this work, we examine its effect on the Hawking radiation of a …

Wilsonian effective theories exploit hierarchies of scale to simplify the description of low-
energy behaviour and play as central a role for gravity as for the rest of physics. They are …

We continue a previous study about the infrared loop effects in the D-dimensional de Sitter
space for a real scalar ϕ 4 theory from the complementary series whose bare mass belongs …

A bstract Under the assumption that a UV theory does not display superluminal behavior, we
ask what constraints on superluminality are satisfied in the effective field theory (EFT). We …

The decoherence mechanism is believed to be possibly connected to the quantum to
classical transition of the primordial cosmological perturbations in the early universe. In this …