Dark Energy and the Hierarchy Problem

Chen, Pisin

Stanford Linear Accelerator Center

关键词: String Models;    Kaluza-Klein Theory Phenomenology-Hep,Astro, Hepph;    72 Physics Of Elementary Particles And Fields;    Phenomenology-Hep,Astro, Hepph;    Symmetry Breaking;   

DOI  :  10.2172/896162
RP-ID  :  SLAC-PUB-12245
RP-ID  :  AC02-76SF00515
RP-ID  :  896162

美国|英语

来源: UNT Digital Library

【 摘 要 】

The well-known hierarchy between the Planck scale (>> 1019GeV) and the TeV scale, namely a ratio of {approx} 10{sup 16} between the two, is coincidentally repeated in a inverted order between the TeV scale and the dark energy scale at {approx} 10{sup -3} eV implied by the observations. We argue that this is not a numerical coincidence. The same brane-world setups to address the first hierarchy problem may also in principle address this second hierarchy issue. Specifically, we consider supersymmetry in the bulk and its breaking on the brane and resort to the Casimir energy induced by the bulk graviton-gravitino mass-shift on the brane as the dark energy. For the ADD model we found that our notion is sensible only if the number of extra dimension n = 2. We extend our study to the Randall-Sundrum model. Invoking the chirality-flip on the boundaries for SUSY-breaking, the zero-mode gravitino contribution to the Casimir energy does give rise to the double hierarchy. Unfortunately since the higher Kaluza-Klein modes acquire relative mass-shifts at the TeV level, the zero-mode contribution to Casimir energy is overshadowed.