Cosmic slowing down of acceleration for several dark energy parametrizations

Understand

We further investigate slowing down of acceleration of the universe scenario for five parametrizations of the equation of state of dark energy using four sets of supernovae data.

• In a maximal probability analysis we also use the baryon acoustic oscillation and cosmic microwave background observations.
• We found the low redshift transition of the deceleration parameter appears, independently of the parametrization, using supernovae data alone except for the Union 2.1 sample.
• This feature disappears once we combine the supernova data with high redshift data.