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In arXiv:0902.4814, a general recipe to construct fake supersymmetricsolutions to fake N=2, d=4 gauged supergravity coupled to abelian vectormultiplets was presented. We use these results to find new multi-centered blackhole solutions in an asymptotically FLRW universe. These satisfy the weakenergy condition and are maximally charged under two U(1) gauge fields coupledto a scalar, which drives the cosmic expansion while rolling down itspotential. As a special subcase, our black holes include the ones constructedpreviously by Gibbons and Maeda in arXiv:0912.2809. The latter contain twonon-negative real numbers n_S, n_T obeying the constraint n_S+n_T=4, with thecases n_T=4 and n_T=1 corresponding to the Kastor-Traschen and theMaeda-Ohta-Uzawa solution respectively. We show that n_S, n_T arise directly asexponents in the prepotential of the fake supergravity theory, and that theabove constraint stems from the fact that the prepotential must be ahomogeneous function of degree two. Finally, some physical properties of theblack holes, like asymptotic behaviour, curvature singularities and trappinghorizons, are also discussed. Similar to other solutions that appearedpreviously in the literature, there is a symmetry enhancement near the eventhorizon, which becomes therefore a Killing horizon, in spite of the highlydynamical nature of the original spacetime. The temperature associated to thisKilling horizon turns out to be nonvanishing.

Black holes in an expanding universe from fake supergravity