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Inflationary dynamics in the braneworld scenarios

Chinese Physics B 2013年第5期22卷 669-673页

作者：张开源吴普训余洪伟 Center of Nonlinear Science and Department of Physics Ningbo University

We analyze the attractor behaviour of the inflation field in braneworld scenarios using the Hamilton-Jacobi formalism, where the Friedmann equation has the form of H2 = ρ + ε(2ρ0ρ)1/2or H2 = ρ + ερ2/2σ , with ε = ±1. We find that in all models the linear homogeneous perturbation can decay exponentially as the scalar field rolls down its potential. However, in the case of a -ρ2 correction to the standard cosmology with ρ 1. Our results show that the perturbation decays more quickly in models with positive-energy correction than in the standard cosmology, which is opposite to the case of negative-energy correction. Thus, the positive-energy modification rather than the negative one can assist the inflation and widen the range of initial conditions.

关键词： inflation braneworld attractor

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D-term Chaotic braneworld in Supergravity Constrained by WMAP9 Data

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Communications in Theoretical Physics 2014年第3期61卷 397-402页

作者： A.Safsafi M.Ferricha-Alami H.Chakir J.Inchaouh M.Bennai Laboratoire de Physique de la Matiére Condens'ee Equipe Physique Quantique et Applications Facultédes Sciences BenM’sik B.P. 7955 Université Hassan II-Mohammedia Laboratoire de Recherche Subatomique et Applications Facultédes Sciences Ben M’sik B.P. 7955 UniversitéHassanII-Mohammedia Laboratoire de Physique de la Matiére Condens'ee Equipe Physique Quantique et Applications Facultédes Sciences BenM’sik B.P. 7955 UniversitéHassan II-Mohammedia Groupement National de Physique des Hautes Energies Focal Point LabUFR-PHE

We study a supergravity D-term chaotic inflationary model, in the context of the braneworld scenario, in particular we consider the Randal1-Sundrum model type 2. Using the latest release from the combination of WMAP9, eCMB, BAO, and Ho, we show that the inflation observables depend only on the number ore-folds N. We also derive all known spectrum inflationary parameters, which are widely consistent with WMAP9 data for a particular choice of values N specially for the scalar spectral index ns and the ratio r. However, the running of the scalar spectral index dns/dlnk is now excluded from the range given by the latest observational measurements.

关键词： D-term chaotic braneworld perturbation spectrum WMAP9

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Kalb-Ramond field localization on a thick de Sitter brane

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Communications in Theoretical Physics 2020年第7期72卷 123-131页

作者： Chen Yang Zi-Qi Chen Li Zhao Institute of Theoretical Physics Lanzhou University222 South Tianshui RoadLanzhou 730000China Research Center of Gravitation Lanzhou University222 South Tianshui RoadLanzhou 730000China

In this paper,we explore the localization condition of Kalb-Ramond(KR)tensorial gauge field on a thick de Sitter(dS)*** the localization mechanism in the work by Chumbes et al(2012 ***.D 85085003),we analyze the localization of KR tensorial gauge field on a non-flat *** propose three kinds of coupling methods and two of them support the localization of zero *** addition,there exist resonant Kaluza-Klein modes on the thick dS *** effects of three parameters on the localization and the resonant mode for the KR field are also discussed.

关键词： Kalb–Ramond field localization braneworld

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Evolution of fermion resonance in thick brane

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Communications in Theoretical Physics 2024年第12期76卷 129-139页

作者： Chun-Chun Zhu Qin Tan Yu-Peng Zhang Yu-Xiao Liu Institute of Theoretical Physics & Research Center of Gravitation Lanzhou University Key Laboratory of Quantum Theory and Applications of Mo E Lanzhou University Lanzhou Center for Theoretical Physics & Key Laboratory of Theoretical Physics of Gansu Province Lanzhou University

In this work, we investigate the numerical evolution of massive Kaluza–Klein(KK) modes of a Dirac field on a thick brane. We deduce the Dirac equation in five-dimensional spacetime, and obtain the time-dependent evolution equation and Schr?dinger-like equation of the extradimensional component. We use the Dirac KK resonances as the initial data and study the corresponding dynamics. By monitoring the decay law of the left-and right-chiral KK resonances, we compute the corresponding lifetimes and find that there could exist long-lived KK modes on the brane. Especially, for the lightest KK resonance with a large coupling parameter and a large three momentum, it will have an extremely long lifetime.

关键词： braneworld dynamic evolution fermion resonance

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