What Do We Really Know about Cosmic Acceleration? | Zendy

Charles Shapiro | Zendy; Michael S. Turner | Zendy

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What Do We Really Know about Cosmic Acceleration?

Author(s) -

Charles Shapiro,

Michael S. Turner

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/506470

Subject(s) - acceleration , cosmic cancer database , physics , need to know , astronomy , computer science , computer security , classical mechanics

Essentially all of our knowledge of the acceleration history of the Universe- including the acceleration itself - is predicated upon the validity ofgeneral relativity. Without recourse to this assumption, we use SNeIa toanalyze the expansion history and find (i) very strong (5 sigma) evidence for aperiod of acceleration, (ii) strong evidence that the acceleration has not beenconstant, (iii) evidence for an earlier period of deceleration and (iv) onlyweak evidence that the Universe has not been decelerating since z~0.3.Comment: 9 pages, 8 figure

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