On virialization with dark energy
Abstract
We review the inclusion of dark energy in the formalism of spherical collapse, and the virialization of a two-component system, made of matter and dark energy. We compare two approaches in previous studies. The first assumes that only the matter component virializes, e.g. as in the case of a classic cosmological constant. The second approach allows the full system to virialize as a whole. We show that the two approaches give fundamentally different results for the final state of the system. This might be a signature discriminating between the classic cosmological constant which cannot virialize and a dynamical dark energy mimicking a cosmological constant. This signature is independent of the measured value of the equation of state. An additional issue which we address is energy non-conservation of the system, which originates from the homogeneity assumption for the dark energy. We propose a way to take this energy loss into account.
- Publication:
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Journal of Cosmology and Astroparticle Physics
- Pub Date:
- July 2005
- DOI:
- 10.1088/1475-7516/2005/07/003
- arXiv:
- arXiv:astro-ph/0505308
- Bibcode:
- 2005JCAP...07..003M
- Keywords:
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- Astrophysics
- E-Print:
- 15 pages, 5 figures. Accepted for publication in JCAP