Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-12-14
Phys.Rev. D64 (2001) 045007
Physics
High Energy Physics
High Energy Physics - Theory
revtex, 63 pages, 8 figures, one table, revised version, more discussions on the global structure, references added
Scientific paper
10.1103/PhysRevD.64.045007
We elaborate on the recently proposed static brane world scenario, where the effective 4-D cosmological constant is exponentially small when parallel 3-branes are far apart. We extend this result to a compactified model with two positive tension branes. Besides an exponentially small effective 4-D cosmological constant, this model incorporates a Randall-Sundrum-like solution to the hierarchy problem. Furthermore, the exponential factors for the hierarchy problem and the cosmological constant problem obey an inequality that is satisfied in nature. This inequality implies that the cosmological constant problem can be explained if the hierarchy problem is understood. The basic idea generalizes to the multibrane world scenario. We discuss models with piecewise adjustable bulk cosmological constants (to be determined by the 5-dimensional Einstein equation), a key element of the scenario. We also discuss the global structure of this scenario and clarify the physical properties of the particle (Rindler) horizons that are present. Finally, we derive a 4-D effective theory in which all observers on all branes not separated by particle horizons measure the same Newton's constant and 4-D cosmological constant.
Flanagan Eanna
Henry Tye S.-H.
Jones Nicholas
Stoica Horace
Wasserman Ira
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