Beyond 3×2-point cosmology: the integrated shear and galaxy 3-point correlation functions
May 26, 202319 pages
Published in:
- JCAP 10 (2023) 028
- Published: Oct 9, 2023
e-Print:
- 2305.17132 [astro-ph.CO]
View in:
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Abstract: (IOP)
We present the integrated 3-point correlation functions (3PCF) involving both the cosmic shear and the galaxy density fields. These are a set of higher-order statistics that describe the modulation of local 2-point correlation functions (2PCF) by large-scale features in the fields, and which are easy to measure from galaxy imaging surveys. Based on previous works on the shear-only integrated 3PCF, we develop the theoretical framework for modelling 5 new statistics involving the galaxy field and its cross-correlations with cosmic shear. Using realistic galaxy and cosmic shear mocks from simulations, we determine the regime of validity of our models based on leading-order standard perturbation theory with an MCMC analysis that recovers unbiased constraints of the amplitude of fluctuations parameter A and the linear and quadratic galaxy bias parameters b and b. Using Fisher matrix forecasts for a DES-Y3-like survey, relative to baseline analyses with conventional 3×2PCFs, we find that the addition of the shear-only integrated 3PCF can improve cosmological parameter constraints by 20–40%. The subsequent addition of the new statistics introduced in this paper can lead to further improvements of 10–20%, even when utilizing only conservatively large scales where the tree-level models are valid. Our results motivate future work on the galaxy and shear integrated 3PCFs, which offer a practical way to extend standard analyses based on 3×2PCFs to systematically probe the non-Gaussian information content of cosmic density fields.Note:
- 19 pages, 8 figures + appendix. Comments are welcome!
- cosmological parameters from LSS
- galaxy clustering
- gravitational lensing
- weak gravitational lensing
References(88)
Figures(10)
- [1]
- [2]
- [3]
- [4]
- [5]
- [7]
- [8]
- [9]
- [10]
- [11]
- [12]
- [13]
- [14]
- [15]
- [16]
- [17]
- [18]
- [19]
- [20]
- [21]
- [22]
- [23]
- [24]
- [25]