Department of Physics & Astronomy
University of New Mexico

Nuclear, Particle, Astroparticle and Cosmology (NUPAC) Seminars

Examining strong lensing anisotropies in the presence of warm and self-interacting dark matter

Presented by Birendra Dhanasingham (UNM)

Over the last two decades, strong gravitational lensing has emerged as a promising tool for studying the nature and distribution of dark matter on sub-galactic scales. In addition to the main-lens substructure, line-of-sight dark matter haloes contribute greatly to the subtle disturbances of lensed images. In our previous work, we showed that these line-of-sight halos leave an anisotropic imprint in the effective convergence maps, resulting in a quadrupole moment of the image-plane averaged two-point correlation function of the effective convergence field. In this talk, I will discuss how, in a strongly lensed system, this anisotropic signal may statistically differentiate the contribution of line-of-sight halo perturbations to lensing perturbations from that of main-lens subhalos. I will also talk about how the anisotropic two-point function changes when warm dark matter and self-interacting dark matter are present.

2:00 pm, Tuesday, May 2, 2023

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