2009

The universe is accelerating. Do we need a new mass scale?

Nesseris, Savvas, Piazza, Federico, Tsujikawa, Shinji

Understand

We try to address quantitatively the question whether a new mass is needed to fit current supernovae data.

For this purpose, we consider an infra-red modification of gravity that does not contain any new mass scale but systematic subleading corrections proportional to the curvature.
The modifications are of the same type as the one recently derived by enforcing the "Ultra Strong Equivalence Principle" (USEP) upon a Friedmann-Lemaitre-Robertson-Walker universe in the presence of a scalar field.
The distance between two comoving observers is altered by these corrections and the observations at high redshift affected at any time during the cosmic evolution.

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