Negative probabilities - can they be real???

Quasi, or Pseudo, or Semi. Or Almost.

Nice video! The QM approach to probability (squared norms) being different from everything else really does baffle me. I'd love to see a video on topics like probability via expectation, free probability, etc. Cheers.

The probability of me finding a girlfriend is for sure negative

it's ok to have signed measures but how is it useful to think of them as probabilities? Alternative interpretations of probability can be fine (e.g. allowing infinitesimals) but it needs to genuinely be a useful idea.

Is 'negative' just a fictional notation element?
-x is just positive movement in the negative direction, ie: positive movement to the left.
So it's a mathematical/linguistic 'trick' rather than having an absolute usage or value.
Just a way to clarify notation to simplify equations.

Almost impossible to follow. Disliked.

There's a wikipedia page about negative probabilities. I've seen negative probabilities pop up in a few places in queueing theory and finance, such as: Cox, 1955: Complex probabilities; Nojo and Watanabe, 1987: Negative branching Probability (NP) distrib.; Graham, Knuth, Patashnik 1994 pg 403; Tijms H, Staats K. NEGATIVE PROBABILITIES AT WORK IN THE M/D/1 QUEUE. Probability in the Engineering and Informational Sciences. 2007;21(1):67-76. doi:10.1017/S0269964807070040

Thanks for watching this, my 4th video, looking at one way in which negative “probabilities” can (maybe) appear in quantum theory. It was not in my original list of video ideas, but was suggested in response to some recent comments on Twitter.

Any suggestions for future topics, please let me know in the comments. Thanks!