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Gravitational vacuum condensate stars, also known as gravastars, have beenproposed as an alternative to black holes. Their interior contains a perfectfluid with an equation of state akin to that of a cosmological constant. Forthis reason, they have recently been considered as a possible astrophysicalsource of dark energy. In this work we argue that gravitational vacuumcondensate stars cannot be the source of dark energy and highlight that adirect coupling of their mass to the dynamics of the Universe would lead to anadditional velocity dependent acceleration, damping their motion with respectto the cosmological frame. We briefly discuss the potential impact of thisadditional acceleration in the context of a recent proposal that the observedmass growth of compact objects at the core of elliptical galaxies might resultfrom such a cosmological coupling.

Can gravitational vacuum condensate stars be a dark energy source?