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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 17:40 |
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Conference: Bucharest University Faculty of Physics 2002 Meeting
Section: Nuclear and Elementary Particles Physics
Title:
Massive Graviton and Determination of Cosmological Constant from Gauge Theory of Gravity
Authors:
Alexandru Mitrut
Affiliation:
Institutul de Stiinte Spatiale, Magurele
E-mail
Keywords:
Abstract:
Keywords: Massive graviton, Cosmological constant, quantum gravity, general relativity.
The universe contains a lot more than meets the eye. Sophisticated experiments search diligently for this invisible dark matter. Here we will describe some theoretical implications of the gravitational gauge theory recently proposed by Ning Wu (hep-th/0112062), namely the possibility of the existence of massive gravitons wich ?fill? the intergalactic space. Dark matter is an important problem in cosmology. In gravitational gauge field theory, the following effects are helpful to solve this problem:
1) The existence of massive graviton will contribute some to dark matter.
2) If the gravitational magnetic field is strong inside a celestial system, the gravitational Lorentz force will provide additional centripetal force for circular motion of a celestial object.
3) The existence of a factor wich violate inverse square law of classical gravity.
Combining general relativity and gravitational gauge theory the cosmological constant is determined theoretically. The cosmological constant is related to the average vaccum energy of the gravitational gauge field. Because the vacuum energy of the gravitational gauge field is negative, the cosmological constant in positive wich generates repulsive force on stars to make the expansion rate of the Universe accelerated. A rough estimation of it gives out its magnitude order$10^{-52}m^{-2}$ , which is well constant with experimental results.
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