Inhomogeneity-Induced Cosmic Acceleration in a Dust Universe

• Main Authors: Chia-Hsun Chuang, 莊家勛
• Other Authors: W-Y. P. Hwang
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/10607839981386873891

碩士 === 國立臺灣大學 === 物理研究所 === 94 === It is the common consensus that the expansion of a universe always slows down if the gravity provided by the energy sources therein is universally attractive. To examine this point we find counter-examples for the spherically symmetric dust fluid described by the Lemaitre-Tolman-Bondi solution. Thus, the validity of this naive consensus is indeed doubtful and the effects of inhomogeneities should be restudied. The example opens a new perspective for understanding the evolution of our universe.