Cosmological Imprint of an Energy Component with General Equation of State

Details Cosmological Imprint of an Energy Component with General Equation of State Cosmological Imprint of an Energy Component with General Equation of State

1997-08-07

arxiv.org/abs/astro-ph/9708069v2

Phys.Rev.Lett.80:1582-1585,1998

Astronomy and Astrophysics

Astrophysics

revised version, with added references, to appear in Phys. Rev. Lett. (4 pages Latex, 2 postscript figures)

Scientific paper

10.1103/PhysRevLett.80.1582

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 ($\Lambda$). 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 $\Lambda$, it evolves dynamically and develops fluctuations, leaving a distinctive imprint on the microwave background anisotropy and mass power spectrum.

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