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Abstract: We present a forecast of dark energy constraints that could be obtained froma large sample of distances to Type Ia supernovae detected and measured fromspace. We simulate the supernova events as they would be observed by aEUCLID-like telescope with its two imagers, assuming those would be equippedwith 4 visible and 3 near infrared swappable filters. We account for knownsystematic uncertainties affecting the cosmological constraints, includingthose arising through the training of the supernova model used to fit thesupernovae light curves. Using conservative assumptions and Planck priors, wefind that a 18 month survey would yield constraints on the dark energy equationof state comparable to the cosmic shear approach in EUCLID: a variabletwo-parameter equation of state can be constrained to ~0.03 at z~0.3. Theseconstraints are derived from distances to about 13,000 supernovae out to z=1.5,observed in two cones of 10 and 50 deg^2. These constraints do not requiremeasuring a nearby supernova sample from the ground. Provided swappable filterscan be accommodated on EUCLID, distances to supernovae can be measured fromspace and contribute to obtain the most precise constraints on dark energyproperties.



Autor: P. Astier, J. Guy, R. Pain, C. Balland

Fuente: https://arxiv.org/







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