Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-11-12
"What Comes Beyond the Standard Models", Bled Workshops in Physics, vol. 5, pp.40-49, N. Borstnik, H.B. Nielsen et.al. eds., L
Physics
High Energy Physics
High Energy Physics - Theory
14 pages, in the proceedings of 7-th Workshop 'What Comes Beyond the Standard Models', Bled (Slovenia) July, 2004; two referen
Scientific paper
The use in the action integral of a volume element of the form $\Phi d^{D}x$ where $\Phi$ is a metric independent measure can give new interesting results in all types of known generally coordinate invariant theories: (1) 4-D theories of gravity plus matter fields; (2) Reparametrization invariant theories of extended objects; (3) Higher dimensional theories. In the case (1), a large number of new effects appears: under normal particle physics conditions (primordial) fermions split into three families; when matter is highly diluted, neutrinos increase their mass and can contribute both to dark energy and to dark matter. In the case (2), it leads to dynamically induced tension; to string models of non abelian confinement; to the possibility of new Weyl-conformally invariant light-like branes which dynamically adjust themselves to sit at black hole horizons; in the context of higher dimensional theories it can provide examples of massless 4-D particles with nontrivial Kaluza Klein quantum numbers. In the case (3), i.e. in brane and Kaluza Klein scenarios, the use of a metric independent measure makes it possible to construct naturally models where only the extra dimensions get curved and the 4-D remain flat.
Guendelman Eduardo
Kaganovich Alexander
Nissimov Emil
Pacheva Svetlana
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