  Strain-induced deformations in graphene are predicted to give rise to large
pseudomagnetic fields. We examine theoretically the case of gas-inflated
bubbles to determine whether signatures of such fields are present in the local
density of states. Sharp-edged bubbles are found to induce Friedel-type
oscillations which can envelope pseudo-Landau level features in certain regions
of the bubble. However, bubbles which minimise interference effects are also
unsuitable for pseudo-Landau level formation due to more spatially varying
field profiles.
