Inhomogeneity-Induced Cosmic Acceleration in a Dust Universe

• Main Author: 朱鴻遠
• Other Authors: 李沃龍
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/11176442847314861977

碩士 === 國立臺灣師範大學 === 物理學系 === 97 === Giving up the homogeneity of the cosmological principle that holds for decades , I consider a spherically symmetric but inhomogeneous Lemaitre -Tolman-Bondi (LTB) metric , which provides an simple toy model for an inhomogeneous universe. To examine an already known mathematical example, I derive the appropriate equations which determine the definition of the redshift. Without dark energy , the accelerating expansion observed by distant supernova data can also be described by spatial variation in matter density.