A modern method for radar stealth through creating an analogue black hole

Analogue black holes have always received plenty of attention and research in recent years due to their unique and astonishing properties, so that they have been designed and implemented in the form of different hydrodynamic, solid state, Bose-Einstein condensate, and optical systems. The most outstanding feature of these types of systems is the ability to trap all kinds of sonic and electromagnetic waves. Noting that detection systems and radars operate based on the transmitting of waves and their reflection from external bodies, analogue black holes have the ability to entirely neutralize and disrupt the performance of radars, and practically, even the most sophisticated types of radars are also unable to identify them. Therefore, if these systems are applied in the country's military and defense industries, we will witness tremendous progress in this regard. In this paper, we introduce analogue black holes as a new alternative in the scope of stealth technology, and by presenting a novel way to produce an analogue black hole by creating a vortex flow in the fluid, we show how this system can trap waves. Examining other stealth methods, we will see that the use of analogue black holes does not have any of the limitations of these procedures and they can appear much more effective in this regard.