Exotic image formation in strong gravitational lensing by clusters of galaxies – I. Cross-section
Sign Up to like & getrecommendations! Published in 2020 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stab577
Abstract: In a recent paper, we have discussed the higher order singularities in gravitational lensing. We have shown that a singularity map, comprising A3- lines and unstable (point) singularities (A4 and D4), is a compact representation… read more here.
Keywords: image formation; gravitational lensing; point; point singularities ... See more keywords
Pinch point singularities of tensor spin liquids
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DOI: 10.1103/physrevb.98.165140
Abstract: Recently, a new class of three-dimensional spin liquid models have been theoretically discovered, which feature generalized Coulomb phases of emergent symmetric tensor $U(1)$ gauge theories. These ``higher rank'' tensor models are particularly intriguing due to… read more here.
Keywords: point singularities; spin liquids; coulomb phases; pinch point ... See more keywords
Topological engineering of terahertz light using electrically tunable exceptional point singularities
Sign Up to like & getrecommendations! Published in 2022 at "Science"
DOI: 10.1126/science.abn6528
Abstract: The topological structure associated with the branch point singularity around an exceptional point (EP) can provide tools for controlling the propagation of light. Through use of graphene-based devices, we demonstrate the emergence of EPs in… read more here.
Keywords: electrically tunable; light; terahertz; exceptional point ... See more keywords