is time traveling possible?

 The research was carried out by a team of researchers at the University of Queensland in Australia and their results are published in the journal Nature Communications.

The study used photons - single particles of light - to simulate quantum particles travelling back through time.

By studying their behaviour, the scientists revealed possible bizarre aspects of modern physics.
 Space-time can be warped and distorted. It takes an enormous amount of matter or energy to create such distortions, but theoretically, distortions are possible.
In the case of a wormhole, a shortcut is made by warping the fabric of space-time. Imagine folding a piece of paper with two pencil marks drawn on it to represent two points in space-time.
The line between them shows the distance from one point to the other in normal space-time.
If the paper is now bent and folded over almost double - the equivalent to warping space-time -  then poking the pencil through the paper provides a much shorter way of linking the two points, in the same way a wormhole would create a shortcut.
The problem with using wormholes to travel in space or time is that they are inherently unstable.  When a particle enters a wormhole, it also creates fluctuations that cause the structure to collapse in on it.
A recent study suggests there are unusual-shaped wormholes than may be able to stay open longer than normal.