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gr-qc2026
Light rings and optical appearances of naked singularities, solitons, and black holes in beyond Horndeski gravity
Hyat Huang, Jutta Kunz, Rashmi Uniyal +1
We investigate the geodesic structure and optical appearance of compact objects with primary scalar hair in shift- and parity-symmetric beyond Horndeski gravity. The analytic solut…
gr-qc2026
Boson Stars surrounded by Polish Doughnuts in Scalar-Tensor Theory
Kristian Gjorgjieski, Maxim Rose, Burkhard Kleihaus +2
We investigate thick accretion disks (Polish Doughnuts) around rotating self-interacting boson stars in general relativity and scalar-tensor theories, focusing on spontaneously sca…