Scalar field as dark energy accelerating expansion of the Universe
نویسندگان
چکیده
منابع مشابه
Dark Energy and the Accelerating Universe
Ten years ago, the discovery that the expansion of the universe is accelerating put in place the last major building block of the present cosmological model, in which the universe is composed of 4% baryons, 20% dark matter, and 76% dark energy. At the same time, it posed one of the most profound mysteries in all of science, with deep connections to both astrophysics and particle physics. Cosmic...
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I describe a new class of quintessence+CDMmodels in which late time scalar field oscillations can give rise to both quintessence and cold dark matter. Additionally, a versatile ansatz for the luminosity distance is used to reconstruct the quintessence equation of state in a model independent manner from observations of high redshift supernovae. 1. A new model of quintessence and cold dark matte...
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It has now been firmly established that the Universe is expanding at an accelerated rate, driven by a presently unknown form of dark energy that appears to dominate our Universe today. A dedicated satellite mission has been designed to precisely map out the cosmological expansion history of the Universe and thereby determine the properties of the dark energy. The SuperNova / Acceleration Probe ...
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The Original Cosmological Constant As we have seen, in 1917 Einstein boldly launched modern cosmology by applying general relativity to the entire universe. He disposed of the Newtonian problem at infinity by invoking a closed geometry.[2] For his model to be consistent with contemporary astronomical data that suggested a static universe, Einstein reluctantly introduced an extra term that oppos...
متن کاملDark Energy and the Accelerated Expansion of the Universe
Recent observations indicate that the expansion of the Universe is accelerating. This suggests the existence of some kind of exotic matter with negative pressure. The simplest possibility is a cosmological constant but there are alternatives, as for instance an evolving scalar eld. In this paper we explore constraints from lensing statistics and high-z type Ia Supernovae on some of these altern...
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ژورنال
عنوان ژورنال: Kinematics and Physics of Celestial Bodies
سال: 2008
ISSN: 0884-5913,1934-8401
DOI: 10.3103/s0884591308060019