scholarly journals WMAP5 OBSERVATIONAL CONSTRAINTS ON BRANEWORLD NEW INFLATION MODEL

2010 ◽  
Vol 25 (01) ◽  
pp. 171-183 ◽  
Author(s):  
R. ZARROUKI ◽  
Z. SAKHI ◽  
M. BENNAI
Keyword(s):  
High Energy ◽  
Observational Constraints ◽  
Type Ii ◽  
Energy Limit ◽  
High Energy Limit ◽  
Inflation Model ◽  
Slow Roll ◽  
Braneworld Model ◽  
Perturbation Spectrum ◽  
Good Agreement

We study a new inflation potential in the framework of the Randall–Sundrum type II braneworld model. Using the technic developed in Ref. 1, we consider both a monomial and a new inflation potentials and apply the slow-roll approximation in high energy limit, to derive analytical expression of relevant perturbation spectrum. We show that for some values of the parameter n in the potential [Formula: see text] we obtain a perturbation spectrum which gives a good agreement with the recent WMAP5 observations.

Observational constraints on reheating in braneworld inflation

2019 ◽  
Vol 34 (27) ◽  
pp. 1950152
Author(s):  
Z. Sakhi ◽  
A. Safsafi ◽  
M. Ferricha-Alami ◽  
H. Chakir ◽  
M. Bennai
Keyword(s):  
Cosmological Parameters ◽  
High Energy ◽  
Observational Constraints ◽  
Brane Tension ◽  
Energy Limit ◽  
Polynomial Potential ◽  
High Energy Limit ◽  
Slow Roll ◽  
Braneworld Inflation ◽  
Best Fit

The reheating era after inflation is analyzed in the framework of the braneworld models. We study reheating by calculating the reheating temperature in a braneworld inflation for various cosmological parameters. The variation of reheating [Formula: see text]-folding number and reheating temperature were obtained and analyzed as function of a spectrum of perturbation for a polynomial potential [Formula: see text]. We have applied the slow-roll approximation in the high energy limit to constraint the parameter potentials by confronting our results to recent Planck 2018 observations. We have shown that in general the best values of the predicted reheating temperature is of the order [Formula: see text] GeV, with a brane tension [Formula: see text] GeV4. We have also shown that the polynomial potential in the case [Formula: see text] provides the best fit results with recent observational constraints.

scholarly journals NMC and the Fine-Tuning Problem on the Brane

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
A. Safsafi ◽  
M. Bennai
Keyword(s):  
Coupling Parameter ◽  
Higgs Field ◽  
High Energy ◽  
Fine Tuning ◽  
Type Ii ◽  
Coupling Constant ◽  
Energy Limit ◽  
Transformation Techniques ◽  
Slow Roll ◽  
Braneworld Model

We propose a new solution to the fine-tuning problem related to coupling constantλof the potential. We study a quartic potential of the formλϕ4in the framework of the Randall-Sundrum type II braneworld model in the presence of a Higgs field which interacts nonminimally with gravity via a possible interaction term of the form-(ξ/2)ϕ2R. Using the conformal transformation techniques, the slow-roll parameters in high energy limit are reformulated in the case of a nonminimally coupled scalar field. We show that, for some value of a coupling parameterξand brane tensionT, we can eliminate the fine-tuning problem. Finally, we present graphically the solutions of several values of the free parameters of the model.

On braneworld inverse power-law inflation

2018 ◽  
Vol 33 (10) ◽  
pp. 1850058 ◽  
Author(s):  
H. Es-sobbahi ◽  
M. Nach
Keyword(s):  
Observational Data ◽  
Power Law ◽  
Equations Of Motion ◽  
High Energy ◽  
Type Ii ◽  
Scalar Model ◽  
Slow Roll ◽  
Inverse Power Law ◽  
Perturbation Spectrum ◽  
High Energy Regime

In the framework of the braneworld Randall–Sundrum type II model, we investigate an inflationary scalar model in the high-energy regime. In this regime, the slow-roll parameters and the perturbation spectrum of the model are derived. The corresponding results are dealt with according to the known observational data. Then the solutions to the equations of motion on the brane are given.

scholarly journals Tachyon-polytropic inflation on the brane

Open Physics ◽  
2013 ◽  
Vol 11 (5) ◽  
Author(s):  
Mohammad Setare ◽  
Vahid Kamali
Keyword(s):  
Equation Of State ◽  
Cosmological Parameters ◽  
High Energy ◽  
Wilkinson Microwave Anisotropy Probe ◽  
Inflationary Universe ◽  
Universe Model ◽  
Exponential Potential ◽  
Energy Limit ◽  
High Energy Limit ◽  
Slow Roll

AbstractWe consider the tachyon-brane inflationary universe model in the context of a polytropic gas equation of state. In slow-roll approximation, we discuss general conditions of this model. For exponential potential, in high-energy limit the characteristics of the model are presented. By using the seven-year Wilkinson Microwave Anisotropy Probe (WMAP7) observational data, we constrain the cosmological parameters of the model.

scholarly journals On Chaplygin Gas Braneworld Inflation with Monomial Potential

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
A. Safsafi ◽  
I. Khay ◽  
F. Salamate ◽  
H. Chakir ◽  
M. Bennai
Keyword(s):  
High Energy ◽  
Chaplygin Gas ◽  
Type Ii ◽  
Energy Limit ◽  
Generalized Chaplygin Gas ◽  
Planck Data ◽  
Central Value ◽  
Braneworld Model ◽  
Perturbation Parameters ◽  
Braneworld Inflation

We study the Chaplygin gas model as a candidate for inflation in the framework of the Randall-Sundrum type II braneworld model. We consider the original and generalized Chaplygin gas model in the presence of monomial potential. The inflationary spectrum perturbation parameters are reformulated and evaluated in the high-energy limit and we found that they depend on several parameters. We also showed that these perturbation parameters are widely compatible with the recent Planck data for a particular choice of the parameters space of the model. A suitable observational central value of ns≃0.965 is also obtained in the case of original and generalized Chaplygin gas.

On braneworld monomial inflation

2018 ◽  
Vol 33 (25) ◽  
pp. 1850147
Author(s):  
R. Ahl Laamara ◽  
H. ES-SOBBAHI ◽  
S. E. Ennadifi
Keyword(s):  
Observational Data ◽  
High Energy ◽  
Equation Of Motion ◽  
Type Ii ◽  
Scalar Model ◽  
Slow Roll ◽  
Energy Regime ◽  
Perturbation Spectrum ◽  
High Energy Regime

We investigate a monomial inflationary scalar model in the braneworld Randall–Sundrum type II model. In the high-energy regime, we determine the slow-roll parameters as well as the perturbation spectrum of the model. According to the known observational data, the corresponding results and the solutions of the equation of motion on the brane are discussed.

HIGH ENERGY LIMIT IN QCD

2011 ◽  
Vol 26 (09) ◽  
pp. 603-623
Author(s):  
ANNA M. STASTO
Keyword(s):  
Inelastic Scattering ◽  
Deep Inelastic Scattering ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
High Energy ◽  
Energy Limit ◽  
High Energy Limit ◽  
Ion Collisions ◽  
Small X

We briefly review some selected topics in the small x physics. In particular, we discuss the progress in the problem related to the resummation at small x and the parton saturation phenomena. Finally we discuss some phenomenological applications to deep inelastic scattering, hadron and heavy ion collisions.

Sign in / Sign up

Export Citation Format

Share Document