Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Future constraints on neutrino isocurvature perturbations in the
  curvaton scenario   In the curvaton scenario, residual isocurvature perturbations can be
imprinted in the cosmic neutrino component after the decay of the curvaton
field, implying in turn a non-zero chemical potential in the neutrino
distribution. We study the constraints that future experiments like Planck,
SPIDER or CMBPol will be able to put on the amplitude of isocurvature
perturbations in the neutrino component. We express our results in terms of the
square root \gamma of the non-adiabaticity parameter \alpha and of the extra
relativistic degrees of freedom \Delta N_eff. Assuming a fiducial model with
purely adiabatic fluctuations, we find that Planck (SPIDER) will be able to put
the following upper limits at the 1sigma level: \gamma < 5.3x10^-3 (1.2x10^-2)
and \Delta N_eff < 0.16 (0.40) . CMBPol will further improve these constraints
to \gamma < 1.5x10^-3 and \Delta N_eff < 0.043. Finally, we recast these bounds
in terms of the background neutrino degeneracy parameter \xi\ and the
corresponding perturbation amplitude \sigma_\xi, and compare with the bounds on
\xi\ that can be derived from Big Bang Nucleosynthesis.

12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat