caa a22 4500 445386290 CHVBK 20180317143033.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10714-011-1233-3 doi (NATIONALLICENCE)springer-10.1007/s10714-011-1233-3 The IR stability of de Sitter QFT: physical initial conditions [Elektronische Daten] [Donald Marolf, Ian Morrison] This work uses Lorentz-signature in-in perturbation theory to analyze the late-time behavior of correlators in time-dependent interacting massive scalar field theory in de Sitter space. We study a scenario recently considered by Krotov and Polyakov in which the coupling g turns on smoothly at finite time, starting from g=0 in the far past where the state is taken to be the (free) Bunch-Davies vacuum. Our main result is that the resulting correlators (which we compute at the one-loop level) approach those of the interacting Hartle-Hawking state at late times. We argue that similar results should hold for other physically-motivated choices of initial conditions. This behavior is to be expected from recent quantum "no hair” theorems for interacting massive scalar field theory in de Sitter space which established similar results to all orders in perturbation theory for a dense set of states in the Hilbert space. Our current work (1) indicates that physically motivated initial conditions lie in this dense set, (2) provides a Lorentz-signature counter-part to the Euclidean techniques used to prove such theorems, and (3) provides an explicit example of the relevant renormalization techniques. Springer Science+Business Media, LLC, 2011 QFT nationallicence De Sitter nationallicence Stability nationallicence Marolf Donald Department of Physics, University of California, 93016, Santa Barbara, CA, USA aut Morrison Ian Department of Physics, University of California, 93016, Santa Barbara, CA, USA aut General Relativity and Gravitation Springer US; http://www.springer-ny.com 43/12(2011-12-01), 3497-3530 0001-7701 43:12<3497 2011 43 10714 https://doi.org/10.1007/s10714-011-1233-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10714-011-1233-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Marolf Donald Department of Physics, University of California, 93016, Santa Barbara, CA, USA aut NATIONALLICENCE 700 1- Morrison Ian Department of Physics, University of California, 93016, Santa Barbara, CA, USA aut NATIONALLICENCE 773 0- General Relativity and Gravitation Springer US; http://www.springer-ny.com 43/12(2011-12-01), 3497-3530 0001-7701 43:12<3497 2011 43 10714 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer