[scottiewottie]

Correct me if I am wrong, but it seems to me that your example was creating new matter, by exerting force on old matter. I can to the same with at trash compactor and the result is certainly more complex.

What I asked for is an example of creating matter out of absolutely nothing.

[Physicist]

The point is that the energy came out of the vacuum, not out of the matter. You said "out of nothing", not "using nothing as a tool".

If you take a region of space filled with gravitational field and stretch it by expanding the space itself, you can do the same thing without any matter. This is how inflation created the matter we see.

The process by which inflation proceeded would probably be extremely difficult to reproduce today. This is because inflation requires the vacuum to be in a higher energy state than it now exhibits. The decay of this "false vacuum" is what drives inflation. We don't know what it would take to throw a region of vacuum back into this excited state. It certainly wouldn't be "easy".

But if easy creation out of nothing is what you want, try this: virtual particle-antiparticle pairs are constantly popping into spontaneous existence out of the vacuum, and quickly annihilating each other again. Every cubic nanometer of the universe seeths with them. We know they are there because we can measure their effect very precisely.