Degenerate Fermi gas perturbations at standard background cosmology
| Autor: | Alex E. Bernardini, E. L. D. Perico |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Physics
High Energy Physics - Theory Cosmology and Nongalactic Astrophysics (astro-ph.CO) COSMIC cancer database Astrophysics::High Energy Astrophysical Phenomena Degenerate energy levels FOS: Physical sciences Perturbation (astronomy) Astronomy and Astrophysics Cosmological constant Astrophysics::Cosmology and Extragalactic Astrophysics Cosmology High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) High Energy Physics - Theory (hep-th) Flow velocity Quantum electrodynamics Shear stress Fermi gas Astrophysics - Cosmology and Nongalactic Astrophysics |
| Popis: | The hypothesis of a tiny fraction of the cosmic inventory evolving cosmologically as a degenerate Fermi gas test fluid at some dominant cosmological background is investigated. Our analytical results allow for performing preliminary computations to the evolution of perturbations for relativistic and non-relativistic test fluids. The density fluctuation, $\delta$, the fluid velocity divergence, $\theta$, and an explicit expression for the dynamics of the shear stress, $\sigma$, are obtained for a degenerate Fermi gas in the background regime of radiation. Extensions to the dominance of matter and to the $\Lambda$CDM cosmological background are also investigated and lessons concerning the formation of large structures of degenerate Fermi gas are depicted. Comment: 20 pages, 4 figures |
| Databáze: | OpenAIRE |
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