scholarly journals Warm inflation in the DGP brane-world model

2007 ◽  
Vol 653 (2-4) ◽  
pp. 122-128 ◽  
Author(s):  
Sergio del Campo ◽  
Ramón Herrera
Keyword(s):  
Brane World ◽  
World Model ◽  
Warm Inflation

scholarly journals Tachyon Warm Intermediate and Logamediate Inflation in the Brane World Model in the Light of Planck Data

2016 ◽  
Vol 2016 ◽  
pp. 1-18 ◽  
Author(s):  
V. Kamali ◽  
M. R. Setare
Keyword(s):  
Scale Factor ◽  
Brane World ◽  
Inflationary Universe ◽  
Tachyon Field ◽  
World Model ◽  
Planck Data ◽  
Warm Inflation ◽  
Slow Roll ◽  
Scalar Spectral Index ◽  
Two Sectors

Tachyon inflationary universe model on the brane in the context of warm inflation is studied. In slow-roll approximation and in longitudinal gauge, we find the primordial perturbation spectrums for this scenario. We also present the general expressions of the tensor-scalar ratio, scalar spectral index, and its running. We develop our model by using exponential potential; the characteristics of this model are calculated in great detail. We also study our model in the context of intermediate (where scale factor expands asa=a0exp⁡Atf) and logamediate (where the scale factor expands asa=a0exp⁡Aln⁡tν) models of inflation. In these two sectors, dissipative parameter is considered as a constant parameter and a function of tachyon field. Our model is compatible with observational data. The parameters of the model are restricted by Planck data.

scholarly journals Vacuum Expectation Value Profiles of the Bulk Scalar Field in the Generalized Randall-Sundrum Model

2015 ◽  
Vol 2015 ◽  
pp. 1-10
Author(s):  
A. Tofighi ◽  
M. Moazzen ◽  
A. Farokhtabar
Keyword(s):  
Scalar Field ◽  
Boundary Conditions ◽  
Cosmological Constant ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
Brane World ◽  
Dirichlet Boundary Conditions ◽  
World Model ◽  
Expectation Value ◽  
Bulk Scalar Field

In the generalized Randall-Sundrum warped brane-world model the cosmological constant induced on the visible brane can be positive or negative. In this paper we investigate profiles of vacuum expectation value of the bulk scalar field under general Dirichlet and Neumann boundary conditions in the generalized warped brane-world model. We show that the VEV profiles generally depend on the value of the brane cosmological constant. We find that the VEV profiles of the bulk scalar field for a visible brane with negative cosmological constant and positive tension are quite distinct from those of Randall-Sundrum model. In addition we show that the VEV profiles for a visible brane with large positive cosmological constant are also different from those of the Randall-Sundrum model. We also verify that Goldberger and Wise mechanism can work under nonzero Dirichlet boundary conditions in the generalized Randall-Sundrum model.

scholarly journals A brane world model with intersecting branes

2001 ◽  
Vol 283 (1-2) ◽  
pp. 8-14 ◽  
Author(s):  
Matej Pavšič
Keyword(s):  
Brane World ◽  
World Model

scholarly journals Features of galactic halo in a brane world model and observational constraints

2009 ◽  
Vol 399 (4) ◽  
pp. 2079-2087 ◽  
Author(s):  
K. K. Nandi ◽  
A. I. Filippov ◽  
F. Rahaman ◽  
Saibal Ray ◽  
A. A. Usmani ◽  
...  
Keyword(s):  
Galactic Halo ◽  
Brane World ◽  
Observational Constraints ◽  
World Model

scholarly journals Angular momentum of a brane-world model

2008 ◽  
Vol 32 (11) ◽  
pp. 865-867
Author(s):  
Jia Bei ◽  
Li Xi-Guo ◽  
Zhang Peng-Ming
Keyword(s):  
Angular Momentum ◽  
Brane World ◽  
World Model

scholarly journals WARPED BRANE-WORLD COMPACTIFICATION WITH GAUSS–BONNET TERM

2003 ◽  
Vol 18 (15) ◽  
pp. 2703-2727 ◽  
Author(s):  
Y. M. CHO ◽  
I. P. NEUPANE
Keyword(s):  
Effective Action ◽  
Planck Scale ◽  
Delta Function ◽  
Einstein Gravity ◽  
Brane World ◽  
Warp Factor ◽  
Second Derivative ◽  
World Model ◽  
Bonnet Term ◽  
Kaluza Klein

In the Randall–Sundrum (RS) brane-world model a singular delta-function source is matched by the second derivative of the warp factor. So one should take possible curvature corrections in the effective action of the RS models in the Gauss–Bonnet (GB) form. We present a linearized treatment of gravity in the RS brane-world with the Gauss–Bonnet modifications to Einstein gravity. We give explicit expressions for the Neumann propagator in arbitrary D dimensions and show that a bulk GB term gives, along with a tower of Kaluza–Klein modes in the bulk, a massless graviton on the brane, as in the standard RS model. Moreover, a nontrivial GB coupling can allow a new branch of solutions with finite Planck scale and no naked bulk singularity, which might be useful to avoid some of the previously known "no-go theorems" for RS brane-world compactifications.

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