• DOI:10.1088/1126-6708/2007/11/051
• Corpus ID: 16971070

A self-tuning mechanism in (3 + p)d gravity-scalar theory

@article{Park2007ASM,
  title={A self-tuning mechanism in (3 + p)d gravity-scalar theory},
  author={Eun Kyung Park and Pyung Seong Kwon},
  journal={Journal of High Energy Physics},
  year={2007},
  volume={2007},
  pages={051-051}
}

• E. Park, P. Kwon
• Published 21 February 2007
• Physics
• Journal of High Energy Physics

We present a new type of self-tuning mechanism for (3 + p)d brane world models in the framework of gravity-scalar theory. This new type of self-tuning mechanism exhibits a remarkable feature. In the limit gs→0, gs being the string coupling, the geometry of bulk spacetime remains virtually unchanged by an introduction of the Standard Model(SM)-brane, and consequently it is virtually unaffected by quantum fluctuations of SM fields with support on the SM-brane. Such a feature can be obtained by introducing Neveu-Schwarz(NS)-brane as a background brane on which our SM-brane is to be set. Indeed, field equations naturally suggest the existence of the background NS-brane. Among the given such models, of the most interest is the case with Λ = 0, where Λ represents the bulk cosmological constant. This model contains a pair of coincident branes (of the SM- and the NS-branes), one of which is a codimension-2 brane placed at the origin of 2d transverse space (≡Σ2), another a codimension-1 brane placed at the edge of Σ2. These two branes are (anti) T-duals of each other, and one of them may be identified as our SM-brane plus the background NS-brane. In the presence of the background NS-brane (and in the absence of Λ), the 2d transverse space Σ2 becomes an orbifold R2/Zn with an appropriate deficit angle. But this is only possible if the (3 + p)d Planck scale M3 + p and the string scale Ms(≡1/√α') are of the same order, which accords with the hierarchy assumption [1–3] that the electroweak scale mEW is the only short distance scale existing in nature.