Phenomenological Models of dark Energy

Details Phenomenological Models of dark Energy Phenomenological Models of dark Energy

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..966..155g&link_type=abstract

RELATIVISTIC ASTROPHYSICS: 4th Italian-Sino Workshop. AIP Conference Proceedings, Volume 966, pp. 155-162 (2008).

Astronomy and Astrophysics

Astrophysics

3

Dark Matter, Dark Energy, Observational Cosmology, Supernova Remnants, Origin, Formation, Evolution, Age, And Star Formation

Scientific paper

As is well known, we are now confronted with a coincidence problem for dark energy, namely, why do we happen to live at a special epoch in which the dark energy density and the dark matter density are comparable? This problem becomes very much sharp especially for the cosmological constant as the dark energy candidate. In order to resolve this cosmological coincidence problem, here we construct two phenomenological cosmology models in which the Universe is made of matter (baryon and dark matter), radiation, and a perfect fluid (playing the role of dark energy). It is shown that the density of the perfect fluid always traces the density of matter in orders in the history of the Universe. Thus the coincidence problem is greatly relaxed.

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