Cosmological Imprint of an Energy Component with General Equation of State
Robert R. CaldwellDepartment of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104R. DaveDepartment of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104Paul J. SteinhardtDepartment of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104
1998en
ABI
Abstract
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 ( $\ensuremath{\Lambda}$). 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 $\ensuremath{\Lambda}$, it evolves dynamically and develops fluctuations, leaving a distinctive imprint on the microwave background anisotropy and mass power spectrum.
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Cited by 120 references