In Defense of an Accelerating Universe: Model Insensitivity of the Hubble Diagram

Understand

A recently published paper by Nielsen, Guffanti and Sarkar argues that the evidence for cosmic acceleration is marginal and that a coasting universe - the Milne Universe - fits the same supernovae data in a Hubble diagram nearly as well.

• The Milne Universe has negative spatial curvature.
• Nevertheless, we confirm that the Milne model fits the data just as well as LCDM.
• We show that this unexpected result points to a weakness in the Hubble diagram rather than to a flaw in LCDM.