Sunyaev-zeldovich Power Excess

While the high-multipole tSZ power is suppressed (see Tension 216), some analyses of Planck and ground-based data suggest a slight excess of power at intermediate scales ($\ell \sim 600-1000$) or a shallower slope than expected from standard pressure profiles. This excess is often difficult to separate from clustered point sources (CIB, radio galaxies) or Galactic foregrounds. If real, it implies a population of "puffed up" lower-mass halos or diffuse filamentary gas that is hotter or more extended than predicted, potentially contradicting the deficit seen at smaller scales unless the gas distribution is highly non-self-similar (Planck Collaboration 2016; Bolliet et al. 2025).

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