Cross-covariances and cross-correlations between Euclid spectroscopic and photometric probes have negligible impact on cosmological parameter constraints.
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Forecasts show Euclid combined probes can constrain log f_R0 at the 1% level for fiducial f_R0=5e-6, distinguishing from LCDM at >3 sigma in optimistic settings.
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Euclid preparation: 6x2 pt analysis of Euclid's spectroscopic and photometric data sets
Cross-covariances and cross-correlations between Euclid spectroscopic and photometric probes have negligible impact on cosmological parameter constraints.
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Euclid: Constraints on f(R) cosmologies from the spectroscopic and photometric primary probes
Forecasts show Euclid combined probes can constrain log f_R0 at the 1% level for fiducial f_R0=5e-6, distinguishing from LCDM at >3 sigma in optimistic settings.