PIRSA:24030119

Stars under Einstein’s microscope: strong gravitational lensing near caustics

Dai, L. (2024). Stars under Einstein’s microscope: strong gravitational lensing near caustics. Perimeter Institute. https://pirsa.org/24030119

Dai, Liang. Stars under Einstein’s microscope: strong gravitational lensing near caustics. Perimeter Institute, Mar. 27, 2024, https://pirsa.org/24030119 

          @misc{ pirsa_PIRSA:24030119,
            doi = {10.48660/24030119},
            url = {https://pirsa.org/24030119},
            author = {Dai, Liang},
            keywords = {Other},
            language = {en},
            title = {Stars under Einstein{\textquoteright}s microscope: strong gravitational lensing near caustics},
            publisher = {Perimeter Institute},
            year = {2024},
            month = {mar},
            note = {PIRSA:24030119 see, \url{https://pirsa.org}}
          }

Liang Dai University of California, Berkeley

DOI 10.48660/24030119
Collection
Talk Type Scientific Series
Subject

Abstract

Rich clusters of galaxies are the largest gravitational magnifiers in the Universe. One of the most interesting gravitational lensing phenomena arises when background galaxies overlap with the lensing caustics cast by the cluster lens, such that a portion of it is tremendously magnified by hundreds to even thousands fold. As a result, Nature’s most luminous classes of stars have been individually or collectively detected by space telescopes from cosmological distances. Quantitatively studying their behavior will enable us to probe an impressive hierarchy of fine mass structures inside the lens: from star-free sub-galactic cold dark matter halos, to intracluster stars, and to even minuscule dark matter clumps predicted in many of the particle physics models of the dark matter. I will talk about what we have theoretically understood about the extremely magnified stars, what latest observational advances there are, and what unique constraints on dark matter micro-structures can be derived.

---

Zoom link