Volume 87, Number 5, September 2009
|Number of page(s)||2|
|Section||Geophysics, Astronomy and Astrophysics|
|Published online||24 September 2009|
Global definition and physical interpretation of the cosmological constant
Department of Physics, Drexel University - Philadelphia, PA 19104, USA
Accepted: 28 August 2009
Defined as a global physical entity, the cosmological constant appears here as a stationary functional of the metric, the matter (dark as well as visible) and the radiation fields. Subject to compact-support variations of the fields, gives the metric, matter and radiation field equations. With this rigorous physical formulation, the empirical relation , where is the average energy-density of matter and radiation, follows from the spacetime average of through the observable four-volume of the Universe on the homogeneity scale where L is the Lagrangian of the matter and radiation fields. Hence, the notion of negative-pressure dark energy is obviated in favor of an energy-density relationship for the cosmological constant that derives from the physical principle . Moreover, this formulation can be employed practically to rule out certain common-suspect free fields as the dominant component of dark matter. In particular, it is readily shown that a massive spin-zero scalar free field or a massive spin-one vector free field are precluded as the dominant component of dark matter.
PACS: 98.80.Jk – Mathematical and relativistic aspects of cosmology / 98.90.+s – Other topics on stellar systems; interstellar medium; galactic and extragalactic objects and systems; the Universe
© EPLA, 2009
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