Anisotropic strong lensing as a probe of dark matter self-interactions

• DOI: 10.48550/arxiv.2306.10109
• Publication Date: 2023-01-01
• Authors: Birendra Dhanasin...; Francis-Yan Cyr-R...; Charlie Mace; Annika H. G. Peter; Andrew Benson
• Keywords: Cosmology and Nongalactic Astrophysics (astro-ph.CO); Astrophysics of Galaxies (astro-ph.GA); 0103 physical sciences; FOS: Physical sciences; Astrophysics - Astrophysics of Galaxies; 01 natural sciences; Astrophysics - Cosmology and Nongalactic Astrophysics

Galaxy-scale strongly lensed systems have been shown to provide a unique technique for exploring the underlying physics of dark matter at sub-galactic scales. In past, much attention was given detecting and studying individual haloes in strong lens system. addition subhaloes, line-of-sight contribute significantly small perturbations images. prior work, we demonstrated that these imprint distinctive anisotropic signature hence give rise detectable non-zero parity-even quadrupole moment effective convergence field's two-point correlation function. this study, show also produce curl component deflection field with parity-odd These multipole moments ability statistically separate from substructure. paper, examine how evolve presence warm self-interacting terms central density evolution halo abundance. Importantly, different display exquisite sensitivity both amplitude velocity dependence self-interaction cross-section. Our approach opens door lensing observations probe over broad range relative velocities.