Assistant Professor Haocun Yu is something of a scientific diplomat. In a recent Physical Review Letters publication, she and her colleagues show how a tabletop experiment can bring together two bedrock physics theories that have never been fully reconciled.
More than a century ago, Albert Einstein gave us the theory of general relativity, describing gravity in relation to space and time on a large scale. Within a decade, physicists were developing a deeper knowledge of quantum mechanics, the laws that govern the subatomic world, including atoms, photons and other microscopic systems.
“Quantum mechanics and general relativity are two of the most successful theories in physics, but they describe nature in very different ways,” Yu explained.

The greatest problem of fundamental physics is — that up to now physicists did not develop and introduce a definition for TIME.
As long as scientist do not know what TIME is — it is not possible to measure TIME and several ideas to this topic are doubtful/wrong too:
e.g. the buddhistic philosophy and Bishop Augustine ( in Confessions, book 11, chapt. 13–29) explained and described — that PAST and FUTUR can not exist in reality: because when they would exist parallel to the PRESENT, then all these events would belong to the PRESENT too.
And the PRESENT is described only as an dynamic state of transition/change — where every event in the universe will happen
According with the buddhistic philosophy and Bishop Augustine — the ideas of PAST, PRESENT, FUTURE are only mental imagination of our phantasy.
And here we can see a problem: When physicists can calculate with mathematics if a TIME-TRAVELLING is possible — then this calculation must be a nonsense. Because it will never be possible to travel to destinations which exist only in our mental mind; in our phantasy
We can hope that in some days/years science will introduce a definiton for TIME — and then it might be possible to reconcile Einsteins´ ideas and quantum physics