125 citations · 932 across the 50 of their papers we have counts for
56 papers
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…
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…
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 $d=4-\ve$ dimensio…
Graph theoretical approach to conformal correlators: The conformal squid
Nikos Irges, Stylianos Kastrinakis
We introduce a discrete, graph theoretic approach to conformal field theory correlators. In a certain basis, called the squid basis, the correlator of N scalar operators can be exp…
Ising Cosmology
Nikos Irges, Antonis Kalogirou, Fotis Koutroulis
Using arguments from holography we propose that the deviation of the cosmological spectral index of scalar fluctuations from unity may be controlled almost entirely by the cr…
Thermal effects in Ising Cosmology
Nikos Irges, Antonis Kalogirou, Fotis Koutroulis
We consider a real scalar field in de Sitter background and compute its thermal propagators. We propose that in a dS/CFT context, non-trivial thermal effects as seen by an 'out' ob…