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Neutrino Cosmology by Sergio Pastor, Gianpiero Mangano, Gennaro Miele, Julien Lesgourgues

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6.4 Observing the large-scale structure

The matter power spectrum can be probed with various techniques on different scales and at different redshifts. In this section, we give a very brief summary of the methods used (or expected to be used in the future) for constraining neutrino parameters, without entering into any technical detail.

6.4.1 Galaxy and cluster power spectrum

Galaxy maps (or, similarly, cluster maps) can be smoothed over small scales and Fourier transformed in order to provide a power spectrum. Relating such a spectrum to the total matter power spectrum discussed in Sections 6.1 and 6.2 is a tricky exercise for several reasons:

  • Galaxies are not perfect tracers of the total dark matter: there is no reason for the relative density ...

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