Sensitivity of the cosmic microwave background anisotropy to initial conditions in quintessence cosmology

Rahul Dave, R. R. Caldwell, Paul J. Steinhardt

Research output: Contribution to journalArticle

60 Scopus citations

Abstract

We analyze the evolution of energy density fluctuations in cosmological scenarios with a mixture of cold dark matter and quintessence, in which the quintessence field is modeled by a constant equation of state. We obtain analytic expressions for the time evolution of the quintessence perturbations in models with light fields. The fluctuations behave analogously to a driven harmonic oscillator, where the driving term arises from the inhomogeneities in the surrounding cosmological fluid. We demonstrate that the homogeneous solution, determined by the initial conditions, is completely subdominant to the inhomogeneous solution for physically realistic scenarios. Thus we show that the cosmic microwave background anisotropy predicted for such models is highly insensitive to the initial conditions in the quintessence field.

Original languageEnglish (US)
Article number023516
JournalPhysical Review D
Volume66
Issue number2
DOIs
StatePublished - Dec 1 2002

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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