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Is the present cosmic expansion decelerating? · Around

2010

Is the present cosmic expansion decelerating?

Wu, Puxun, Yu, Hongwei

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We probe the recent cosmic expansion by directly reconstructing the deceleration parameter $q(z)$ at recent times with a linear expansion at $z=0$ using the low redshift SNIa and BAO data.

Our results show that the observations seem to favor a slowing down of the present cosmic acceleration.
Using only very low redshift SNIa data, for example, those within $z<0.1$ or $0.2$, we find that our Universe may have already entered a decelerating expansion era since a positive $q(0)$ seems to be favored.
This result is further supported by a different approach which aims to reconstruct $q(z)$ in the whole redshift region.

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