Is the Universe infinite or is it just really big?

Janna Levin, Evan Scannapieco, Joseph Silk

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

The global geometry of the Universe is in principle as observable an attribute as local curvature. Previous studies have established that if the Universe is wrapped into a flat hypertorus, the simplest compact space, then the fundamental domain must be at least 0.4 times the diameter of the observable Universe. We derive the spectrum of temperature fluctuations for the other five compact, orientable flat spaces and show that the same bound holds for all, although prominent geometric features in sky maps can, in principle, distinguish between these spaces. Our analysis provides the first limits on any of the twisted tori and the hexagonal prisms.

Original languageEnglish (US)
Article number103516
Pages (from-to)1035161-1035165
Number of pages5
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume58
Issue number10
StatePublished - Nov 15 1998
Externally publishedYes

Fingerprint

Hexagonal prism
universe
Fundamental Domain
Compact Space
Torus
Curvature
Attribute
Fluctuations
prisms
sky
curvature
geometry
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Mathematical Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Is the Universe infinite or is it just really big? / Levin, Janna; Scannapieco, Evan; Silk, Joseph.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 58, No. 10, 103516, 15.11.1998, p. 1035161-1035165.

Research output: Contribution to journalArticle

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