Neutrino dark energy-revisiting the stability issue

被引：65

作者：

Bjaelde, Ole Eggers ^{[1
]}

Brookfield, Anthony W. ^{[2
,3
]}

van de Bruck, Carsten ^{[2
]}

Hannestad, Steen ^{[1
]}

Mota, David F. ^{[4
,5
]}

Schrempp, Lily ^{[6
]}

Tocchini-Valentini, Domenico ^{[7
]}

机构：

[1] Univ Aarhus, Dept Phys & Astron, DK-8000 Aarhus C, Denmark

[2] Univ Sheffield, Dept Appl Math, Astro Particle Theory & Cosmol, Sheffield S3 7RH, S Yorkshire, England

[3] Univ Sheffield, Dept Phys, Astro Particle Theory & Cosmol Grp, Sheffield S3 7RH, S Yorkshire, England

[4] Heidelberg Univ, Inst Theoret Phys, D-69120 Heidelberg, Germany

[5] Univ Astrophys, Inst Theoret Phys & Astrophys, N-0315 Oslo, Norway

[6] DESY, Deutsches Elektron Synchroton, D-22607 Hamburg, Germany

[7] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2008年 / 01期

关键词：

dark energy theory; cosmological neutrinos; cosmological perturbation theory; cosmology of theories beyond the SM;

D O I：

10.1088/1475-7516/2008/01/026

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A coupling between a light scalar field and neutrinos has been widely discussed as a mechanism for linking (time varying) neutrino masses and the present energy density and equation of state of dark energy. However, it has been pointed out that the viability of this scenario in the non-relativistic neutrino regime is threatened by the strong growth of hydrodynamic perturbations associated with a negative adiabatic sound speed squared. In this paper we revisit the stability issue in the framework of linear perturbation theory in a model independent way. The criterion for the stability of a model is translated into a constraint on the scalar-neutrino coupling, which depends on the ratio of the energy densities in neutrinos and cold dark matter. We illustrate our results by providing meaningful examples for both stable and unstable models.

引用

页数：24

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