Extended Data Fig. 3: Caustics.
From: Einstein rings modulated by wavelike dark matter from anomalies in gravitationally lensed images
Close-up around a cusp of the caustic for a ϱDM versus ψDM halo that both have the same global profile (see Extended Data Table 1). Colours indicate lensing magnification (brighter for higher magnification) imposed onto the brightest of the multiply lensed images depending on where the source is located. a, The simple and smooth caustic (white loci) of a ϱDM halo, for which the fine striations are computational artefacts. b, The complex caustic of a ψDM halo with many branching microcaustics, for which the finest striations are again computational artefacts. Black rectangles bound the same region in the source plane near a cusp of the caustic, within which we placed a source at seventy-five different locations to mimic ψDM halos created using seventy-five different GRF realisations (to save computation effort and time) for computing the positional and brightness anomalies in Fig 3.
