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2009

Is cosmic acceleration slowing down?

Shafieloo, Arman, Sahni, Varun, Starobinsky, Alexei A.

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We investigate the course of cosmic expansion in its `recent past' using the Constitution SN Ia sample (which includes CfA data at low redshifts), jointly with signatures of baryon acoustic oscillations (BAO) in the galaxy distribution and fluctuations in the cosmic microwave background (CMB).

Earlier SN Ia data sets could not address this issue because of a paucity of data at low redshifts.
Allowing the equation of state of dark energy (DE) to vary, we find that a coasting model of the universe (q_0=0) fits the data about as well as LCDM.
This effect, which is most clearly seen using the recently introduced `Om' diagnostic, corresponds to an increase of Om(z) and q(z) at redshifts z \lleq 0.3.

Is cosmic acceleration slowing down? · Around

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