Abstract
The discovery of the acceleration of the rate of expansion of the
universe fosters new explorations of the behaviour of gravitation
theories in the cosmological context. Either the GR framework is
valid but a cosmic component with a negative equation of state is
dominating the energy – matter contents or the universe is better
described at large by a theory that departs from GR. In this review,
we address theoretical alternatives that have been explored through
supernovae.
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