Cosmic growth and expansion conjoined

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• 作者：Eric V. Linder ; ^{evlinder@lbl.gov}
• 关键词：Cosmic acceleration ; Growth of large scale structure ; Modified gravity ; Dark energy
• 刊名：Astroparticle Physics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：86
• 期：Complete
• 页码：41-45
• 全文大小：623 K
• 卷排序：86

文摘

Cosmological measurements of both the expansion history and growth history have matured, and the two together provide an important test of general relativity. We consider their joint evolutionary track, showing that this has advantages in distinguishing cosmologies relative to considering them individually or at isolated redshifts. In particular, the joint comparison relaxes the shape degeneracy that makes fσ8(z) curves difficult to separate from the overall growth amplitude. The conjoined method further helps visualization of which combinations of redshift ranges provide the clearest discrimination. We examine standard dark energy cosmologies, modified gravity, and “stuttering” growth, each showing distinct signatures.