imaginary time

How can imaginary time have anything to do with the real universe?

Unfortunately the physical meaning of imaginary time is not clear.

This means that what happened in imaginary time could be calculated.

The order of the operators will change if the small imaginary time changes sign.

However, the beginning in imaginary time will not be a singularity.

But the histories of the particles in imaginary time would continue.

This means that there can be no important difference between the forward and backward directions of imaginary time.

I think that imaginary time will come to seem as natural as a round earth does now.

The small imaginary time plays a critical role here.

But in imaginary time, there are no singularities or boundaries.

Only if we could picture the universe in terms of imaginary time would there be no singularities.

I have also been criticized fiercely by philosophers for using imaginary time.

What is the point of introducing the concept of imaginary time?

But the imaginary time direction is at right angles to real time.

I was savagely attacked by a philosopher of science for talking about imaginary time.

I want to suggest that the idea of imaginary time is something that we will also have to come to accept.

Imaginary time is already a commonplace of science fiction.

Imaginary time may sound like science fiction but it is in fact a well-defined mathematical concept.

"Zefram, I'm serious, don't tell them about your imaginary time travelers!"

Rather, it should be taken over histories in imaginary time that were closed in on themselves, like the surface of the earth.

One may think of w as "imaginary time", but the only thing that has changed is the mathematical form, not the underlying physics.

Firstly, it depends only on the difference of the imaginary times:

The three space directions and imaginary time would form a space-time that was closed in on itself, without boundaries or edges.

To avoid the technical difficulties with Feynman's sum over histories, one must use imaginary time.

Imaginary time is indistinguishable from directions in space.