Cosmological imprint of an energy component with general equation of state

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

Research output: Contribution to journalArticlepeer-review

3067 Scopus citations


We examine the possibility that a significant component of the energy density of the Universe has an equation of state different from that of matter, radiation, or cosmological constant (Λ). An example is a cosmic scalar field evolving in a potential, but our treatment is more general. Including this component alters cosmic evolution in a way that fits current observations well. Unlike Λ, it evolves dynamically and develops fluctuations, leaving a distinctive imprint on the microwave background anisotropy and mass power spectrum.

Original languageEnglish (US)
Pages (from-to)1582-1585
Number of pages4
JournalPhysical review letters
Issue number8
StatePublished - Feb 23 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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