Vector dark energy and high-z massive clusters
  The detection of extremely massive clusters at $z>1$ such as SPT-CL
J0546-5345, SPT-CL J2106-5844, and XMMU J2235.3-2557 has been considered by
some authors as a challenge to the standard \LCDM$\;$cosmology. In
fact,assuming Gaussian initial conditions, the theoretical expectation of
detecting such objects is as low as $\leq 1%$. In this \textit{Letter} we
discuss the probability of the existence of such objects in the light of the
Vector Dark Energy (VDE) paradigm, showing by means of a series of $N$-body
simulations that chances of detection are substantially enhanced in this
non-standard framework.
