The optical appearance of a body compact enough to feature an unstable bound orbit, when
surrounded by an accretion disk, is expected to be dominated by a luminous ring of radiation …

In this work we consider the observational properties of compact boson stars with self-
interactions orbited by isotropically emitting (hot-spot) sources and optically thin accretion …

The geodesics of the Ellis-Bronnikov wormhole with two parameters are studied. The
asymmetric wormhole has only one light ring and one innermost stable circular orbit located …

In this work, we present a review of Energy-Momentum Squared Gravity (EMSG)--more
specifically, $ f (R, T_ {\mu\nu} T^{\mu\nu}) $ gravity, where $ R $ represents the Ricci scalar …

In this paper, we investigate the shadows and rings of the charged Horndeski black hole
illuminated by accretion flow that is both geometrically and optically thin. We consider two …

In this work we analyze traversable wormhole spacetimes in the framework of a covariant
generalization of Einstein's General Relativity known as energy–momentum squared gravity …

In this work, we study spherically symmetric vacuum solutions in one-parameter new
general relativity (NGR), a specific theory in teleparallel gravity which is constructed from the …

In this work we analyze the observational properties of relativistic fluid spheres when orbited
by isotropically emitting sources, known as hot spots. We consider fluid star configurations in …

We analyse the lensing images by dynamically robust rotating (mini-) Proca stars
surrounded by thin accretion disks. Due to their peculiar geodesic structure we show that …

In this study, we investigated the optical properties of charged black holes within the Einstein-
Maxwell-scalar (EMS) theory. We evaluated the shadow cast by these black holes and …