منابع مشابه
Why do we observe a small but nonzero cosmological constant?
The current observations seem to suggest that the universe has a positive cosmological constant of the order of H 2 0 while the most natural value for the cosmological constant will be L−2 P , where LP = (Gh̄/c3)1/2 is the Planck length. This reduction of the cosmological constant from L−2 P to L −2 P (LPH0) 2 may be interpreted as due to the ability of quantum microstructure of spacetime to rea...
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Contrary to popular mythology, Einstein did not invent the cosmological constant just in order construct his model universe. He discussed it earlier in “The Foundations of General Relativity”in connection with the proper structure of the source-free field equations. There he dismissed it as arbitrary and unnecessary. It was later that he found its inclusion to be essential to the construction o...
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We outline a dynamical dark energy scenario whose signatures may be simultaneously tested by astronomical observations and laboratory experiments. The dark energy is a field with slightly sub-gravitational couplings to matter, a logarithmic self-interaction potential with a scale tuned to ∼ 10 eV, as is usual in quintessence models, and an effective mass mφ influenced by the environmental energ...
متن کاملThe Cosmological Constant
This is a review of the physics and cosmology of the cosmological constant. Focusing on recent developments, I present a pedagogical overview of cosmology in the presence of a cosmological constant, observational constraints on its magnitude, and the physics of a small (and potentially nonzero) vacuum energy.
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2010
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2010.17614.x