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Abstract
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We profit by a recent paper of Visser claiming that
Rastall gravity is equivalent to Einstein gravity to compare
the two gravitational theories in a general way. Our conclu-
sions are different from Visser’s ones. We indeed argue that
these two theories are not equivalent. In fact, Rastall theory
of gravity is an “open” theory when compared to Einstein
general theory of relativity. Thus, it is ready to accept the
challenges of observational cosmology and quantum gravity.
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