DGP Cosmological model with generalized Ricci dark energy
  The braneworld model proposed by Dvali, Gabadadze and Porrati (DGP) leads to
an accelerated universe without cosmological constant or other form of dark
energy for the positive branch $(\epsilon =+1)$. For the negative branch
$(\epsilon =-1)$ we have investigated the behavior of a model with an
holographic Ricci-like dark energy and dark matter, where the IR cutoff takes
the form $\alpha H^2 + \beta \dot{H}$, being $H$ the Hubble parameter and
$\alpha$, $\beta$ positive constants of the model. We perform an analytical
study of the model in the late-time dark energy dominated epoch, where we
obtain a solution for $r_cH(z)$, where $r_c$ is the leakage scale of gravity
into the bulk, and conditions for the negative branch on the holographic
parameters $\alpha$ and $\beta$, in order to hold the conditions of weak energy
and accelerated universe. On the other hand, we compare the model versus the
late-time cosmological data using the latest type Ia supernova sample of the
Joint Light-curve Analysis (JLA), in order to constraint the holographic
parameters in the negative branch, as well as $r_cH_0$ in the positive branch,
where $H_0$ is the Hubble constant. We find that the model has a good fit to
the data and that the most likely values for $(r_cH_0, \alpha, \beta)$ lie in
the permitted region found from an analytical solution in a dark energy
dominated universe. We give a justification to use holographic cut-off in 4D
for the dark energy in the 5 dimensional DGP model. Finally, using the Bayesian
Information Criterion we find that this model it is disfavored compared with
the flat $\Lambda$CDM model.
