Dark energy properties from large future galaxy surveys
We perform a detailed forecast on how well a EUCLID-like survey will be able to constrain dark energy and neutrino parameters from a combination of its cosmic shear power spectrum, galaxy power spectrum, and cluster mass function measurements. We consider also the survey's potential to measure...
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| Veröffentlicht in: | Journal of cosmology and astroparticle physics 2014-05, Vol.2014 (5), p.i-25 |
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| container_issue | 5 |
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| container_title | Journal of cosmology and astroparticle physics |
| container_volume | 2014 |
| creator | Basse, Tobias Bjaelde, Ole Eggers Hamann, Jan Hannestad, Steen Wong, Yvonne YY |
| description | We perform a detailed forecast on how well a EUCLID-like survey will be able to constrain dark energy and neutrino parameters from a combination of its cosmic shear power spectrum, galaxy power spectrum, and cluster mass function measurements. We consider also the survey's potential to measure dark energy perturbations in models wherein the dark energy is parameterised as a fluid with a nonstandard non-adiabatic sound speed, and find that in an optimistic scenario in which w sub(0) deviates from -1 by as much as is currently observationally allowed, models with c super(2) sub(s) = 10 super(-6) and c super(2) sub(s) = 1 can be distinguished from one another at more than 2[sigma] significance. The 1[sigma] sensitivity to the effective number of relativistic species N super(ml) sub(eff) is approximately 0.03, meaning that the small deviation of 0.046 from 3 in the standard value of N super(ml) sub(eff) due to non-instantaneous decoupling and finite temperature effects can be probed with 1[sigma] precision for the first time. |
| doi_str_mv | 10.1088/1475-7516/2014/05/021 |
| format | Article |
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| subjects | ANISOTROPY ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Computational fluid dynamics COSMOLOGICAL MODELS COSMOLOGY Dark energy Decoupling Deviation Dicalcium silicate GALAXIES Mathematical analysis Mathematical models NEUTRINOS NONLUMINOUS MATTER POTENTIALS RELATIVISTIC RANGE RELICT RADIATION SENSITIVITY SPECTRA Surveys TEMPERATURE DEPENDENCE |
| title | Dark energy properties from large future galaxy surveys |
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