Role of geometry in the superfluid flow of nonlocal photon fluids

European Research Council under the European Unions Seventh Framework Programme (FP)/ERC [GA 306559]; EPSRC (UK) [EP/J00443X/1]; ERC through the QGBE grant; EU-FET Proactive grant AQuS [640800]; Autonomous Province of Trento, through the SiQuro project ("On Silicon Chip Quantum Optics for Quantum Computing and Secure Communications")