Thermal effects in Ising Cosmology

Abstract

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' observer can be encoded in the anomalous dimensions of the $d=3$ Ising model. One of these anomalous dimensions, the critical exponent $\eta$, fixes completely a number of cosmological observables, which we compute

Comments: 15 pages, 2 figures, version accepted for publication, clarifications regarding the thermal propagator added, general presentation improved, references added, typos corrected