What is time in physics?
Time is just a measure. This measure is obtained when the motion of an object is compared to another object with regular motion, a regular motion established as standard. The most common regular motion used by us is the rotation of earth, to which we call day. We compare day with all our duties, when we work, when we play, when we sleep, when we do experiments. Everything we do and observe we compare it with day.
To make more accurate our measurements we have divided the period of a day in 24 parts called hours. Hours divided by 60 give us minutes and a minute divide by 60 give us seconds. A more recent clock uses the standard motion of the vibration of the atom of Cesium, but for scientific purposes is also compared to the second.
Then, time as a measure is all physics need to perform its best.
Any other idea, insight and/or hypothesis made about time as something else other than a measure, such is pure imagination at work.
This base foundation made over solid ground with rocks filled with concrete above, debunks the sand base foundation made by Relativity portraying time as capable not only to flow but also to be flexible, like bubble gum.
When the several articles -assumed to be of scientific origin- talk of time reversal, time warp, lump of time, relativistic time, quantum time, and similar, all these so called studies are nothing but entertainment, science fiction, pseudoscience. Their pages are full of illustrations made with computer programing, but do not represent reality because time is not objective.
The whole propaganda made about Relativity and its flexible time is based on a fraud made by Eddington in 1919. Rather than Einstein receiving a Nobel Prize because Relativity, the members of the Swiss Academy declared that the prize wasn't given to him because Relativity theory is not science but philosophy.
Years later, Eddington decided to bring back over the surface the already buried Relativity, inventing the existence of black holes, imaginary bodies in space which are so terrible that can pull light, galaxies, stars, space, and even time on their way. These bodies assumed to be the literal four horses of Revelation if not the Devil himself in person.
But, these black bodies is not a recent invention. Two centuries before Eddington, a similar body was imagined as well. But contrary to the idea of a collapsed star, it was on the contrary a calculation in paper about a star so big, but so big, that its gravity will prevent its own light to escape. These bodies were known as black spheres.
The supporters of these fantasies are having great trouble here to show real evidence of the existence of time, also about the real duty of clocks, and they to establish credibility time and black holes really exist in the universe. Enough is to discard time as flowing and dilating, also demonstrating that clocks only perform in a calibrate duty, and Relativity theory is no more in science.
The members of the Swiss Academy were correct in 1922: Relativity theory is just philosophy and has no business in science.
Same as well, the theory daughter called black hole is as false as the mother Relativity.
Now, it is just wait for same old same old denial by relativists. Their show is over, but it seems they have not noticed yet.
Er, my hovercraft is full of eels.