Very happy to have posted my first new paper in about 10 months (excluding the CosmoVerse white paper) today (after several months spent applying for grants and teaching, with very little research done), together with Marco Calzà, Davide Pedrotti, and Guan-Wen Yuan, making it yet another paper entirely produced within my group! This is the third chapter in the series on primordial regular black holes as potential dark matter candidates (see the earlier part 1 and part 2, both published in PRD - paper 1 and paper 2), where we consider a completely different metric, which we call the Zhang-Lewandowski-Ma-Yang (ZLMY) BH, after the names of the authors which first proposed it here. This BH has completely different properties with respect to the ones we had considered earlier: it has a very strong theoretical foundation within an effective canonical (loop) quantum gravity framework which addresses the important issue of general covariance, whereas from the phenomenological perspective it is one of the few BHs which is hotter with respect to the Schwarzschild BH. We find that this leads to a smaller asteroid mass window where ZLMY PBHs can account for all the DM, smaller relative to Schwarzschild PBHs of course, a result which completely reverses the trend we found earlier, when the asteroid mass window was significantly enlarged and evaporation constraints could in principle be bypassed. You can read our results in the preprint we just posted on arXiv: 2507.02396.
