Is the universe expanding at an accelerating rate

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wolram
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http://www.ox.ac.uk/news/science-blog/universe-expanding-accelerating-rate-–-or-it

Now, a team of scientists led by Professor Subir Sarkar of Oxford University's Department of Physics has cast doubt on this standard cosmological concept. Making use of a vastly increased data set – a catalogue of 740 Type Ia supernovae, more than ten times the original sample size – the researchers have found that the evidence for acceleration may be flimsier than previously thought, with the data being consistent with a constant rate of expansion.

Can we debunk this paper?
 
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