scholarly journals Quantum effects, brane tension, and large hierarchy in the brane world

2001 ◽  
Vol 63 (4) ◽  
Author(s):  
Shinji Mukohyama
Keyword(s):  
Quantum Effects ◽  
Brane World ◽  
Brane Tension ◽  
Large Hierarchy

scholarly journals "SELF-TUNING" AND CONFORMALITY

2000 ◽  
Vol 15 (30) ◽  
pp. 1879-1890 ◽  
Author(s):  
ZURAB KAKUSHADZE
Keyword(s):  
Brane World ◽  
Infinite Volume ◽  
Brane Tension ◽  
Codimension One ◽  
World Volume ◽  
Self Tuning ◽  
Flat Solution ◽  
Range Of Values ◽  
Continuous Range ◽  
Tuning Property

We consider an infinite-volume brane world setup where a codimension one-brane is coupled to bulk gravity plus a scalar field with vanishing potential. The latter is protected by bulk supersymmetry, which is intact even if brane supersymmetry is completely broken as the volume of the extra dimension is infinite. Within this setup we discuss a flat solution with a "self-tuning" property, i.e. such a solution exists for a continuous range of values for the brane tension. This infinite-volume solution is free of any singularities, and has the property that the brane cosmological constant is protected by bulk supersymmetry. We, however, also point out that consistency of the coupling between bulk gravity and brane matter generically appears to require that the brane world-volume theory be conformal.

scholarly journals BRANE-WORLD COSMOLOGY AND VARYING G

2010 ◽  
Vol 25 (18n19) ◽  
pp. 3835-3856 ◽  
Author(s):  
LEONARDO AMARILLA ◽  
HÉCTOR VUCETICH
Keyword(s):  
Scalar Field ◽  
Cosmological Model ◽  
Time Variation ◽  
Brane World ◽  
Brane Tension ◽  
Bulk Scalar Field

We consider a brane-world cosmological model coupled to a bulk scalar field. Since the brane tension turns out to be proportional to Newton's coupling G, in such a model a time variation of G naturally occurs. By resorting to available bounds on the variation of G, the parameters of the model are constrained. The constraints coming from nucleosynthesis and CMB result to be the severest ones.

scholarly journals (Non)-singular brane-world cosmology induced by quantum effects in five-dimensional dilatonic gravity

2000 ◽  
Vol 62 (10) ◽  
Author(s):  
Shin’ichi Nojiri ◽  
Octavio Obregon ◽  
Sergei D. Odintsov
Keyword(s):  
Quantum Effects ◽  
Brane World

scholarly journals Brane world inflation induced by quantum effects

2000 ◽  
Vol 484 (1-2) ◽  
pp. 119-123 ◽  
Author(s):  
Shin'ichi Nojiri ◽  
Sergei D. Odintsov
Keyword(s):  
Quantum Effects ◽  
Brane World

scholarly journals DILATON STABILIZATION AND INFLATION IN THE D-BRANE WORLD

2006 ◽  
Vol 21 (04) ◽  
pp. 363-371 ◽  
Author(s):  
HANG BAE KIM
Keyword(s):  
Scalar Curvature ◽  
Extra Dimensions ◽  
Brane World ◽  
Brane Tension ◽  
Cosmic Evolution

We study possible mechanisms of the dilaton stabilization in the D-brane world in which a compactified D-brane constitutes our universe. The dilaton can be stabilized due to the interplay between the D-brane tension and the negative scalar curvature of extra dimensions. Cosmic evolution of the dilaton is investigated with the obtained dilaton potential and it is found that inflation can be realized before the settlement of the dilaton.

scholarly journals A NOVEL APPROACH TO THE COSMOLOGICAL CONSTANT PROBLEM

2004 ◽  
Vol 19 (27) ◽  
pp. 4621-4640 ◽  
Author(s):  
ALBERTO IGLESIAS ◽  
ZURAB KAKUSHADZE
Keyword(s):  
Brane World ◽  
Fine Tuning ◽  
Infinite Volume ◽  
Brane Tension ◽  
Smooth Solutions ◽  
Cosmological Constant Problem ◽  
Novel Approach ◽  
World Volume ◽  
Higher Dimensional ◽  
Continuous Range

We propose a novel infinite-volume brane world scenario where we live on a noninflating spherical 3-brane, whose radius is somewhat larger than the present Hubble size, embedded in higher dimensional bulk. Once we include higher curvature terms in the bulk, we find completely smooth solutions with the property that the 3-brane world-volume is noninflating for a continuous range of positive values of the brane tension, that is, without fine-tuning. In particular, our solution, which is a near-BPS background with supersymmetry broken on the brane around TeV, is controlled by a single integration constant.

scholarly journals Toward Solving the Cosmological Constant Problem?

2003 ◽  
Vol 18 (18) ◽  
pp. 3221-3262 ◽  
Author(s):  
Olindo Corradini ◽  
Alberto Iglesias ◽  
Zurab Kakushadze
Keyword(s):  
Cosmological Constant ◽  
Extra Dimensions ◽  
Brane World ◽  
Infinite Volume ◽  
Brane Tension ◽  
Smooth Solutions ◽  
Cosmological Constant Problem ◽  
World Volume

We discuss the cosmological constant problem in the context of higher codimension brane world scenarios with infinite-volume extra dimensions. In particular, by adding higher curvature terms in the bulk action we are able to find smooth solutions with the property that the four-dimensional part of the brane world-volume is flat for a range of positive values of the brane tension.

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