source : www.indy100.com
It’s a hypothetical concept that has fascinated humanity throughout history, both in the world of science and fiction, but could we be closer than ever to discovering the existence of time travel?
Well no, not exactly.
However, scientists have published a new study that could change our understanding of what could theoretically be possible regarding time travel.
Essentially, the new research effectively rules out the concept that anyone can go back in time.
A new study has shown that time in the universe can only go one way – and it’s all thanks to a new study into light and its relationship to other objects.
However, because time as a concept is now framed in this way, where it can only move forward linearly in the universe, the new research suggests that moving backward in time is an impossibility.
The speed of light often changes as it passes through an interface, but the actual breakdown of what happens at the interface is never known with certainty.
Assistant Professor Matias Koivurova from the University of Eastern Finland is the lead author of the study published in the journal Optica, which has come up with a new answer based on the argument that the universe has one space dimension and one time dimension.
Essentially, they proposed a solution to the question of what happens to the momentum of light around an interface – and that solution depends entirely on the fact that time only moves in the universe.
Koivurova said: “In principle, I found a very neat way to derive the standard wave equation in 1+1 dimensions. The only assumption I needed was that the speed of the wave is constant. Then I thought to myself: what what if it isn’t always that way? This turned out to be a very good question.”
Professor Marco Ornigotti, head of the study, also said: ‘There is a very famous debate in physics called the Abraham-Minkowski controversy. The controversy is that when light enters a medium, what happens to its momentum? Minkowski said the momentum is increasing, while Abraham insisted it is decreasing.
“We discovered that we can assign a ‘correct time’ to the wave, which is completely analogous to the correct time in general relativity.”
If time in the universe only moves forward, the dreams we have about revisiting the past may remain fiction.
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source : www.indy100.com