Absolute Zero 🎯

I once read of an experiment conducted using a very cold gas (a fraction above absolute zero), that was then focused on with lasers and a shifting EM field. The resulting arrangement apparently made the gas' temperature below absolute zero, according to the way that temperature is calculated. This was fascinating to me; I have included the link for reference, as Nature explains it far better than I do.

https://www.nature.com/articles/nature.2013.12146

The resonance of this quote from the article to The Grand Canyon chapter of Arrangement of Lilies is astounding:

“It’s like walking through a valley, then instantly finding yourself on the mountain peak.”

I was thinking about the concepts of absolutes within physics, and letting wonder run rampant with light and cold, as it did with my poem, Cold Light.

https://songoflovepiecesofeight.blogspot.com/2023/12/cold-light.html?m=1

If such an arrangement can be found to cross one "absolute" threshold, using effects closely bound with the other (laser, light), could something similar be done with the other, by using effects closely bound with the first?

What would happen if a particle moving near the speed of light were suddenly cooled? It seems that such cooling would reduce the speed, at least "internally" (how is this typically calculated, anyway, is such a speed only currently reached by subatomic particles?), so what if something near absolute zero is sped up to near the speed of light and then heated/allowed to become hotter? Some interesting ponderings, as I prepare for sleep.

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