  The electrons in graphene for energies close to the Dirac point have been
found to form strongly interacting fluid. Taking this fact into account we have
extended previous work on the transport properties of graphene by taking into
account possible interactions between the currents and adding the external
magnetic field directed perpendicularly to the graphene sheet. The
perpendicular mag- netic field B severely modifies the transport parameters. In
the present approach the quantization of the spectrum and formation of Landau
levels is ignored. Gauge/gravity duality has been used in the probe limit. The
dependence on the charge density of the Seebeck coefficient and thermo-electric
parameters {\alpha}ij nicely agree with recent experimental data for graphene.
The holographic model allows for the interpretation of one of the fields
representing the currents as resulting from the dark matter sector. For the
studied geometry with electric field perpendicular to the thermal gradient the
effect of dark sector has been found to modify the transport parameters but
mostly in a quantitative way only. This makes difficult the detection of this
elusive component of the Universe by studying transport properties of graphene.
