Metamorphoses of the flow past an obstacle of a resonantly driven bistable polariton fluid

Motivated by recent experiments, we theoretically analyze the flow past an obstacle of a one-dimensional ``quantum fluid light,'' which is resonantly driven, and exhibits bistability. The found to abruptly change several times when velocity or potential strength increased. These transitions display unusual features. In contrast cases usual fluids superfluids, take place between stationary states. They involve bistability in essential way. Remarkably, at points, wake lies unstable intermediate density state.