Although time travel continues to be the biggest dream of many of us, we have not achieved much concrete success in this regard. So, how possible is it to reverse time? No for linear time at the moment, but a first in reversing it in a different way.
Scientists have succeeded in observing the 'temporal reflection' in electromagnetic signals. In other words, the signal traveled back in linear time as if rewinding a movie.
The reflection you see in the mirror right now, when we go in front of a mirror, is actually the result of an event defined as 'spatial reflection', and even though our image is reflected in the opposite direction, the time inside the mirror continues to flow linearly. In the same way, when you become Rocky and go to the top of the mountain and shout 'ADRIAN', the echo you hear is 'ADRIAN' again.
But in temporal reflection, the situation is much different. This event, which was put forward 60 years ago and has remained only a hypothesis until today, simply causes the temporal reflection of the 'ADRIAN' signal to return as 'NAIRDA'.
How was this temporal reflection observed?
Unlike spatial reflection, temporal reflection does not occur as a result of hitting something. Instead, it is possible by a sudden change in the characteristics of the environment in which the signal is located. A part of the signal flows from the present to the past, as we see in the red part in the image above.
Scientists used 'metamaterials' with properties not found in nature to change the environment that would enable temporal reflection.
What is metamaterial?
Metamaterials are formed by combining structures of microscopic dimensions created with materials such as plastic and metal into repeating patterns. Thanks to these materials, it is possible to observe the interactions of light and sound that are not seen in nature.
What will this historic achievement offer us?
Success will not make us see all of the world's time as if it were mirrored. But according to scientists, it will pave the way for the development of small-sized, low-energy, and signal-powered computers and new ways of wireless communication.