What Expands in an Expanding Universe?

Anais da Academia Brasileira de Ciências

JosÉ A. De Freitas Pacheco¹ 

关键词: cosmic expansion;    cosmology;    cosmological models;    gravitation;    expansão cósmica;    cosmologia;    modelos cosmológicos;    gravitação;   

DOI  :  10.1590/0001-3765201520140650

来源: SciELO

【 摘 要 】

ABSTRACT 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.

【 授权许可】

CC BY   
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