Euclid preparation - VII. Forecast validation for Euclid cosmological probes

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Table 16.

Marginalised 1σ errors on cosmological parameters, relative to their corresponding fiducial value for a flat spatial geometry, in a w₀, w_a, γ cosmology.

Spectroscopic galaxy clustering, GC_s
Setting	Ω_m, 0	Ω_b, 0	Ω_DE, 0	w₀	w_a	h	n_s	σ₈	γ

ΛCDM flat

Linear	0.016	0.026	–	–	–	0.0031	0.0093	0.0071	–
Pessimistic	0.021	0.051	–	–	–	0.0063	0.014	0.0094	–
Intermediate	0.019	0.047	–	–	–	0.0058	0.012	0.0085	–
Optimistic	0.013	0.018	–	–	–	0.0017	0.0099	0.0077	–

ΛCDM non-flat

Linear	0.022	0.033	0.021	–	–	0.0067	0.013	0.0073	–
Pessimistic	0.053	0.092	0.035	–	–	0.017	0.028	0.0094	–
Intermediate	0.048	0.084	0.033	–	–	0.016	0.026	0.0086	–
Optimistic	0.015	0.018	0.021	–	–	0.0031	0.012	0.0085	–

w₀, w_a flat

Linear	0.080	0.10	–	0.20	0.66	0.0063	0.030	0.024	–
Pessimistic	0.17	0.26	–	0.39	1.4	0.020	0.063	0.045	–
Intermediate	0.14	0.21	–	0.31	1.1	0.017	0.048	0.036	–
Optimistic	0.051	0.068	–	0.15	0.45	0.0032	0.018	0.021	–

w₀, w_a non-flat

Linear	0.083	0.10	0.075	0.23	0.89	0.0068	0.031	0.027	–
Pessimistic	0.18	0.26	0.11	0.39	1.5	0.023	0.066	0.045	–
Intermediate	0.14	0.21	0.093	0.32	1.2	0.020	0.050	0.036	–
Optimistic	0.064	0.089	0.090	0.24	0.97	0.0038	0.020	0.027	–

w₀, w_a, γ flat

Linear	0.10	0.13	–	0.28	0.83	0.0073	0.036	0.028	0.17
Pessimistic	0.181	0.27	–	0.39	1.5	0.026	0.068	0.050	0.33
Intermediate	0.14	0.21	–	0.30	1.2	0.021	0.051	0.040	0.29
Optimistic	0.067	0.094	–	0.20	0.55	0.0037	0.020	0.021	0.25

w₀, w_a, γ non-flat

Linear	0.11	0.13	0.075	0.28	0.92	0.0073	0.036	0.028	0.20
Pessimistic	0.18	0.27	0.11	0.40	1.5	0.029	0.070	0.050	0.33
Intermediate	0.14	0.22	0.094	0.32	1.2	0.024	0.053	0.040	0.29
Optimistic	0.072	0.10	0.090	0.25	0.98	0.0040	0.021	0.027	0.26

Notes. We show results for the linear, pessimistic, and optimistic settings as well as the intermediate setting described in Eq. (208), for GC_s only.

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