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

2007/02/28 by Eun Kyung Park, Pyung Seong Kwon
Physics and Astronomy · #Black Holes and Theoretical Physics #Brane #Brane cosmology #Cosmology and Gravitation Theories #Electroweak scale #Extra dimensions #Hierarchy problem #M-theory #Noncommutative and Quantum Gravity Theories #Orbifold #String (physics) #String theory #Superstring theory #hep-th

paper · pdf · doi:10.1088/1126-6708/2007/11/051

published as JHEP0711:051,2007

openalex publication_date 2007/11/19 · arxiv created 2007/11/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

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 g_s → 0, g_s 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 /Z_n with an appropriate deficit angle. But this is only possible if the (3+p)d Planck scale M_3+p and the string scale M_s(≡ 1/√α^′) are of the same order, which accords with the hierarchy assumption \cite1,2,3 that the electroweak scale m_EW is the only short distance scale existing in nature.

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