Conformally Invariant Brane-universe and the Cosmological Constant
E.I.Guendelman, E. Spallucci
TL;DR
This paper presents a conformally invariant formulation of a 3-brane universe in six dimensions, avoiding the need for a cosmological constant and addressing the cosmological constant problem.
Contribution
It introduces a gauge-type, conformally invariant model of a 3-brane in 6D using a modified measure, eliminating the necessity of a cosmological constant.
Findings
Conformal invariance achieved with a modified measure independent of the metric.
A brane-world scenario constructed without a cosmological constant.
No cosmological constant problem at the 6D model level.
Abstract
A relativistic 3-brane can be given a conformally invariant, gauge-type, formulation provided the embedding space is six-dimensional. The implementation of conformal invariance requires the use of a modified measure, independent of the metric in the action. A brane-world scenario without the need of a cosmological constant in 6D can be constructed. Thus, no ``old'' cosmological constant problem appears at this level.
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