Years ago I read an article in a science magazine about a paper regarding anti-entropic matter. Entropy is one of the arrows of time which is arbitrary, meaning it can run in either direction, which means it was just as likely for our Universe to be entropic or anti-entropic. It was once believed that any anti-entropic matter would long since have been eliminated through interaction with entropic matter, but this article said the study used computer modelling to show anti-entropic matter would be much more resilient than was previously believed.

This got me to wondering if it's possible that there are possibly local areas of anti-entropic matter and, if so, what physical properties it would possess. For example, what would an anti-entropic star look like?

I've been asking this question for years, and no one has been able to even venture a guess. How would an anti-entropic star appear to us? Or an anti-entropic galaxy? Would it have a supermassive white hole at its centre?