Condensate cosmology -- dark energy from dark matter

Details Condensate cosmology -- dark energy from dark matter Condensate cosmology -- dark energy from dark matter

2002-11-13

arxiv.org/abs/astro-ph/0211303v3

Phys.Rev. D68 (2003) 043504

Astronomy and Astrophysics

Astrophysics

13 pages, 13 colour figures. Final version with discussion of TE cross-correlation spectra for condensation and metamorphosis

Scientific paper

10.1103/PhysRevD.68.043504

Imagine a scenario in which the dark energy forms via the condensation of dark matter at some low redshift. The Compton wavelength therefore changes from small to very large at the transition, unlike quintessence or metamorphosis. We study CMB, large scale structure, supernova and radio galaxy constraints on condensation by performing a 4 parameter likelihood analysis over the Hubble constant and the three parameters associated with Q, the condensate field: Omega_Q, w_f and z_t (energy density and equation of state today, and redshift of transition). Condensation roughly interpolates between Lambda CDM (for large z_t) and sCDM (low z_t) and provides a slightly better fit to the data than Lambda CDM. We confirm that there is no degeneracy in the CMB between H and z_t and discuss the implications of late-time transitions for the Lyman-alpha forest. Finally we discuss the nonlinear phase of both condensation and metamorphosis, which is much more interesting than in standard quintessence models.

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