3 papers
hep-th2025
The thermal backreaction of a scalar field in de Sitter spacetime
Nikos Irges, Antonis Kalogirou, Fotis Koutroulis
We argue that a scalar field in de Sitter spacetime should feel explicit thermal effects associated with its curvature. Starting from the Bunch-Davies vacuum and a scalar field wit…
hep-th2025
Energy momentum tensor correlators in theory II: The spin-two sector
Nikos Irges, Leonidas Karageorgos
We extend the computation of the C_T charge of the 2-point function of the Energy-Momentum Tensor to 4-loops. We show that C_T decomposes into two sectors, the conformal sector, wh…
hep-th2024
Energy-Momentum tensor correlators in theory I: The spin-zero sector
Nikos Irges, Leonidas Karageorgos
We revisit the construction of the renormalized trace of the Energy-Momentum tensor in the four-dimensional theory,using dimensional regularization in $d=4-\ve$ dimen…