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SUMMARY:Cris Sabiu\, "Climbing the N-point Ladder: Breaking Degeneracies b
 etween Cosmology and Halo Model"
DTSTART:20260811T070000Z
DTEND:20260811T090000Z
DTSTAMP:20260910T220000Z
UID:indico-event-1379@indico.ibs.re.kr
DESCRIPTION:The galaxy two-point function leaves much of the cosmological 
 information in the nonlinear density field untapped. Higher-order clusteri
 ng statistics recover it\, but their promise for real surveys rests on whe
 ther that information survives our ignorance of how galaxies occupy dark m
 atter halos. I will present a configuration-space Fisher forecast built on
  the connected four-point correlation function (4PCF) measured on the Quij
 ote simulations with the GPU N-point estimator GRAMSCI.\nFor dark matter h
 alos\, adding the connected 4PCF to the two- and three-point functions tig
 htens ΛCDM and Neutrino (Mν) constraints by roughly 50% and helps break 
 the σ₈–Mν degeneracy\, because its information lies along complement
 ary directions. I then repeat the analysis on HOD galaxy mocks\, marginali
 zing over a realistic galaxy–halo model: halo occupation\, satellite vel
 ocity bias\, and assembly bias. The central result is that the connected-4
 PCF information gain persists\, and for some parameters even grows\, under
  this full marginalization\, yielding a neutrino-mass forecast robust to g
 alaxy-formation systematics. Configuration-space higher-order clustering t
 hus emerges as a genuinely robust probe for Stage-IV spectroscopic surveys
 . Our result are available: https://arxiv.org/abs/2607.09116\n\nhttps://in
 dico.ibs.re.kr/event/1379/
URL:https://indico.ibs.re.kr/event/1379/
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