What Do We Really Know About Cosmic Acceleration?

2); 2) ((1) University of Chicago; (2) Kavli Institute for Cosmological Physics); Charles Shapiro (1; Michael S. Turner (1

What Do We Really Know About Cosmic Acceleration?

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arxiv astro-ph/0512586 v1 pith:COCZGGLY submitted 2005-12-23 astro-ph

Charles Shapiro (1 , 2) , Michael S. Turner (1 , 2) ((1) University of Chicago , (2) Kavli Institute for Cosmological Physics) This is my paper · ORCID

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Essentially all of our knowledge of the acceleration history of the Universe - including the acceleration itself - is predicated upon the validity of general relativity. Without recourse to this assumption, we use SNeIa to analyze the expansion history and find (i) very strong (5 sigma) evidence for a period of acceleration, (ii) strong evidence that the acceleration has not been constant, (iii) evidence for an earlier period of deceleration and (iv) only weak evidence that the Universe has not been decelerating since z~0.3.

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Gaussian Process Estimation of Transition Redshift
astro-ph.CO 2019-08 conditional novelty 4.0 of 10

From Hubble parameter and Type Ia supernova data, Gaussian Process reconstruction places the cosmic deceleration-to-acceleration transition at z_t ≈ 0.59 and z_t ≈ 0.68, respectively.

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