When particles smash into each other at high speeds, they might be creating tiny 'black hole' zones that just delete them from existence.
March 27, 2026
Original Paper
Dynamical Causal Horizons and the Quarkonium Flow Paradox
arXiv · 2603.24623
The Takeaway
When atoms are smashed together, certain particles disappear. Physicists usually blame a hot 'soup' of matter, but this paper suggests the particles are actually being cut off by 'causal horizons'—tiny regions of space-time so distorted by acceleration that the particles literally can't see each other anymore.
From the abstract
The sequential suppression of heavy quarkonia in ultra-relativistic $A+A$ collisions is conventionally interpreted as evidence of a thermalized Quark-Gluon Plasma. However, the simultaneous observation of vanishing elliptic flow ($v_2 \approx 0$) for bottomonium contradicts the path-length dependence inherent in macroscopic transport models. We propose a geometric resolution: quarkonium suppression is governed by the extreme spacetime geometry generated during initial fragmentation, rather than