  In this paper we give a physical explanation to the accelerated expansion of
the Universe, alleviating the tension between the discrepancy of Hubble
constant measurements. By the Euler Cauchy stress principle, we identify a
controversy on the lack of consideration of the surface forces contemplated in
the study of the expansion of the Universe. We distinguish a new effect that
modifies the spacetime fabric by means of the energy conservation equation. The
resulting dynamical equations from the proposed hypothesis are contrasted to
several testable astrophysical predictions. This paper also explains why we
have not found any particle or fluid responsible for dark energy and clarifies
the Cosmological Coincidence Problem. These explanations are achieved without
assuming the existence of exotic matter of unphysical meaning or having to
modify the Einstein's Field Equations.
