Signatures of Wormhole Spacetime in Shadow and Quasi-Normal Nodes

Observational evidence, including LIGO, EHT, and astrophysical results, are yet to confirm the existence of the black hole horizon.
Also, it has been pointed out by several research groups that the LIGO observations of merger and ringdown and shadow observed by EHT do not exclude horizon-less exotic compact objects. We present stability analysis and light propagation in wormhole spacetimes for which
we have considered a couple of wormhole geometries. The motivation behind these choices lies in the fact that the geometries may be
constructed out of ordinary matter where the violation of energy conditions are relaxed compared to the standard 4D GR framework.
We investigated the geometrical structure of the spacetime and concentrated on null geodesics with the aim of exploring the shadow features.
The shadow characteristics in a framework where the space is devoid of any sources between the compact object and the observer has been
observed. In addition to this, we have also studied the effect of the environment in particular plasma on the shadow characteristics. Finally, we
explore the stability under scalar perturbation; studying the time domain profile, we find the quasi-normal frequencies. By comparing the
characteristics of the shadow images and the quasi-normal frequencies, we identify the features that could serve as discriminants for
similar compact objects.