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Abstract: A signature of the dark energy equation of state may be observed in the shapeof voids. We estimate the constraints on cosmological parameters that would bedetermined from the ellipticity distribution of voids from future spectroscopicsurveys already planned for the study of large scale structure.The constraints stem from the sensitivity of the distribution of ellipticityto the cosmological parameters through the variance of fluctuations of thedensity field smoothed at some length scale. This length scale can be chosen tobe of the order of the comoving radii of voids at very early times when thefluctuations are Gaussian distributed. We use Fisher estimates to show that theconstraints from void ellipticities are promising. Combining these constraintswith other traditional methods results in the improvement of the Dark EnergyTask Force Figure of Merit on the dark energy parameters by an order of hundredfor future experiments. The estimates of these future constraints depend on anumber of systematic issues which require further study using simulations. Weoutline these issues and study the impact of certain observational andtheoretical systematics on the forecasted constraints on dark energyparameters.



Author: Rahul Biswas, Esfandiar Alizadeh, Benjamin D. Wandelt

Source: https://arxiv.org/







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