A possible origin of the $\alpha$-vacuum as the initial state of the Universe

Autor:	Chen, Pisin, Lin, Kuan-Nan, Lin, Wei-Chen, Yeom, Dong-han
Rok vydání:	2024
Předmět:	General Relativity and Quantum Cosmology
Druh dokumentu:	Working Paper
Popis:	We investigate the cosmological observables using the Euclidean path integral approach. Specifically, we study both the no-boundary compact instantons scenario and the Euclidean wormholes scenario that can induce the creation of two universes from nothing. It is known that perturbations associated with the no-boundary scenario can only be consistent with the Bunch-Davies vacuum. Here we demonstrate that the Euclidean wormholes can allow for a de Sitter invariant vacuum, the so-called $\alpha$-vacuum state, where the Bunch-Davies vacuum is a special case. This therefore provides the $\alpha$-vacuum a geometrical origin. As an aside, we discuss a subtle phase issue when considering the power spectrum related to $\alpha$-vacuum in the closed universe framework. Comment: 25 pages, 8 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2404.15450 Zobrazit plný text záznamu View this record from Arxiv