Reconciling Planck with the local value of $H_0$ in extended parameter
  space
  The recent determination of the local value of the Hubble constant by Riess
et al, 2016 (hereafter R16) is now 3.3 sigma higher than the value derived from
the most recent CMB anisotropy data provided by the Planck satellite in a LCDM
model. Here we perform a combined analysis of the Planck and R16 results in an
extended parameter space, varying simultaneously 12 cosmological parameters
instead of the usual 6. We find that a phantom-like dark energy component, with
effective equation of state $w=-1.29_{-0.12}^{+0.15}$ at 68 % c.l. can solve
the current tension between the Planck dataset and the R16 prior in an extended
$\Lambda$CDM scenario. On the other hand, the neutrino effective number is
fully compatible with standard expectations. This result is confirmed when
including cosmic shear data from the CFHTLenS survey and CMB lensing
constraints from Planck. However, when BAO measurements are included we find
that some of the tension with R16 remains, as also is the case when we include
the supernova type Ia luminosity distances from the JLA catalog.
