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The difference in the magnitudes of supernovae in the ΛCDM and Timescape cosmologies and the magnitudes the supernovae would appear to have in an empty universe (horizontal dashed line).Both models show recent apparent acceleration following earlier deceleration.The new study—by a group at the University of Canterbury in Christchurch, New Zealand—finds the fit of Type Ia supernovae to a model universe with no dark energy to be very slightly better than the fit to the standard dark energy model.Dark energy is usually assumed to form roughly 70% of the present material content of the Universe.Although injured, the driver of the car managed to clamber out of the wreckage.Shocked, Andrew went to help the unconscious RAC member and called the emergency services.
Whether or not one infers accelerating expansion then depends crucially on the clock used.
“With traffic volumes rising and several recent serious accidents involving roadside assistance patrols and breakdown contractors we need motorists to consider a new approach to how they drive past stricken vehicles, drivers and passengers, and those working in vulnerable locations.” The RAC wants drivers to slow down, make space by moving over to the right in their lane – or change lanes if it is safe - and move on once past the scene, rather than rubbernecking.
“Until you find yourself stood or working on the hard shoulder it’s impossible to comprehend just how frightening it can be and what it feels like when cars and lorries are passing you at high speeds,” said Steve.
Deciding that not only requires more data, but also better understanding properties of supernovae which currently limit the precision with which they can be used to measure distances.
On that score, the new study shows significant unexpected effects which are missed if only one expansion law is applied.