  We consider graphene in the presence of external magnetic field and elastic
deformations that cause emergent magnetic field. The total magnetic field
results in the appearance of Landau levels in the spectrum of quasiparticles.
In addition, the quasiparticles in graphene experience the emergent gravity. We
consider the particular choice of elastic deformation, which gives constant
emergent magnetic field and vanishing torsion. Emergent gravity may be
considered as perturbation. We demonstrate that the corresponding first order
approximation affects the energies of the Landau levels only through the
constant renormalization of Fermi velocity. The degeneracy of each Landau level
receives correction, which depends essentially on the geometry of the sample.
There is the limiting case of the considered elastic deformation, that
corresponds to the uniformly stretched graphene. In this case in the presence
of the external magnetic field the degeneracies of the Landau levels remain
unchanged.
