What Expands in an Expanding Universe?

In the present investigation, the possible effects of the expansion of the Universe on systems bonded either by gravitational or electromagnetic forces, are reconsidered. It will be shown that the acceleration (positive or negative) of the expanding background, is the determinant factor affecting pl...

Full description

Saved in:
Bibliographic Details
Published in:Anais da Academia Brasileira de Ciências 2015-12, Vol.87 (4), p.1915-1927
Main Author: Pacheco, José A De Freitas
Format: Article
Language:English
Subjects:
cosmologia
expansão cósmica
gravitação
modelos cosmológicos
MULTIDISCIPLINARY SCIENCES
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In the present investigation, the possible effects of the expansion of the Universe on systems bonded either by gravitational or electromagnetic forces, are reconsidered. It will be shown that the acceleration (positive or negative) of the expanding background, is the determinant factor affecting planetary orbits and atomic sizes. In the presently accepted cosmology (ΛCDM) all bonded systems are expanding at a decreasing rate that tends to be zero as the universe enters in a de Sitter phase. It is worth mentioning that the estimated expansion rates are rather small and they can be neglected for all practical purposes.
ISSN:0001-3765
1678-2690
1678-2690
DOI:10.1590/0001-3765201520140650