BROWSE

Related Researcher

Author

UNIST, Researcher
UNIST
Research Interests
  • All Subjects

ITEM VIEW & DOWNLOAD

Euclidean quantum gravity and stochastic inflation

Cited 2 times inthomson ciCited 1 times inthomson ci
Title
Euclidean quantum gravity and stochastic inflation
Author
Hwang, Dong-ilLee, Bum-HoonStewart, Ewan D.Yeom, Dong-HanZoe, Heeseung
Keywords
UNIVERSE; DYNAMICS; MODEL
Issue Date
201303
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW D, v.87, no.6, pp.063502 -
Abstract
In this paper, we compare dispersions of a scalar field in Euclidean quantum gravity with stochastic inflation. We use Einstein gravity and a minimally coupled scalar field with a quadratic potential. We restrict our attention to small mass and small field cases. In the Euclidean approach, we introduce the ground state wave function which is approximated by instantons. We used a numerical technique to find instantons that satisfy classicality. In the stochastic approach, we introduce the probability distribution of Hubble patches that can be approximated by locally homogeneous universes down to a smoothing scale. We assume that the ground state wave function should correspond to the stationary state of the probability distribution of the stochastic Universe. By comparing the dispersion of both approaches, we conclude three main results. (1) For a statistical distribution with a certain value, we can find a corresponding instanton in the Euclidean side, and it should be a complex-valued instanton. (2) The size of the Universe of the Euclidean approach corresponds to the smoothing scale of the stochastic side; the Universe is homogeneous up to the Euclidean instanton. (3) In addition, as the mass increases up to a critical value, both approaches break at the same time. Hence, generation of classical inhomogeneity in the stochastic approach and the instability of classicality in the Euclidean approach are related.
URI
Go to Link
DOI
http://dx.doi.org/10.1103/PhysRevD.87.063502
ISSN
1550-7998
Appears in Collections:
DGS_Journal Papers
Files in This Item:
000315737600002.pdfDownload

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qr_code

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU