Free scalar correlators in de Sitter via the stochastic approach beyond slow roll

Autor:	Cable, Archie, Rajantie, Arttu
Rok vydání:	2020
Předmět:	General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory
Zdroj:	Imperial/TP/2020/AC/3436477
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevD.104.103511
Popis:	The stochastic approach to calculating scalar correlation functions in de Sitter spacetime is extended beyond the overdamped "slow roll" approximation. We show that with the correct noise term, it reproduces the exact asymptotic long-distance behaviour of field correlators in free field theory, thereby demonstrating the viability of the technique. However, we also show that the na\"ive way of calculating the noise term by introducing a cut-off at the horizon does not give the correct answer unless the cut-off is chosen specifically to give the required result. We discuss the implications of this for interacting theories. Comment: Accepted for publication to Physical Review D
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2011.00907 Zobrazit plný text záznamu View this record from Arxiv