Could dark matter follow reverse entropy?

I had a random idea pop in my head while watching a video describing the relationship between radiation's energy density and entropy. And I'd like to run it past some people who have a deeper understanding of physics than I.

What if dark matter follows an inverted curve? What if we can't see it because while energetic it emits less radiation and then will become brighter and hotter as it loses energy? Perhaps it even has reversed entropy too and becomes more energetic over time.

This might be crazy, but dark matter is pretty crazy itself. Am I completely off base, or could that line up with any real theories? Maybe it could work with antimatter instead of dark matter?

Worst case I'm just curious and wrong, best case I inspire someone to discover something new. Thanks