Astrophysics, abstract
astro-ph/0512058

From: Duoje Jia [view email]

Date (v1): Fri, 2 Dec 2005 14:03:45 GMT (11kb)
Date (revised v2): Sat, 3 Dec 2005 15:40:25 GMT (11kb)
Date (revised v3): Fri, 23 Dec 2005 11:18:24 GMT (28kb)

The Cosmological Constant in Brane Cosmology

Authors: Jia-Zhong Chen, Duoje Jia

Comments: 6 pages, 1 figure, RevTex 4 form

We propose, based on brane cosmology, an explicit relation $% R=M_{Pl}R_{extra}^{2}$ of the radius of the observed brane Universe and the extra dimensions for solving both the hierarchy problem and the cosmological constant problem without fine-tuning. This relation associates the dark energy (i.e., cosmic acceleration) in the cosmological physics with the electroweak scale in particle physics, thereby links the cosmological observations (by WMAP, Planck satellite, SNAP, etc.) to the accelerators (such as LHC, Tevatron). Assuming that the supersymmetry on our Standard Model brane is broken near the TeV energy scale, and the curvature induced by the resulted cosmological constant occurs only in the extra dimensions. As a result, the effective cosmological constant (ZPE in higher dimensions) observed in our brane--dark energy--is a natural consequence of the breaking of supersymmetry in the brane near the TeV.