检索结果-南通市图书馆

Communications in Theoretical Physics 2021年第5期73卷 10-17页

作者： rami ahmad ei-nabulsi Alireza Khalili Golmankhaneh Biomedical Device Innovation Center Shenzhen Technology University3002 Lantian RoadPingshan DistrictShenzhen518118China Research Center for Quantum Technology Faculty of ScienceChiang Mai UniversityChiang Mai50200Thailand Athens Institute for Education and Research Mathematics and Physics Divisions8 Valaoritou StreetKolonaki10671AthensGreece Department of Physics Urmia BranchIslamic Azad UniversityUrmiaIran

In this study,we prove that modified diffusion equations,including the generalized Burgers'equation with variable coefficients,can be derived from the Black-Scholes equation with a time-dependent parameter based on the propagator method known in quantum and statistical *** extension for the case of a local fractal derivative is also addressed and analyzed.

关键词： Black-Scholes equation heat kernels modified diffusion equations generalized Burger's equation fractal calculus

Accelerated D-Dimensional Compactified Universe in Gauss-Bonnet-Dilatonic Scalar Gravity from D-Brane/M-Theory

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2008年第8期25卷 2785-2788页

作者： EL-nabulsi ahmad rami Department of Nuclear and Energy Engineering Cheju National University Ara-dong 1 Jeju 690-756 South Korea

We discuss a particular d-dimensional Gauss- Ronnet-dilatonie universe compactified on S^1 motivated from Mtheory. We examine the time-evolution of the dynamical equations where many interesting consequences are revealed and discussed in some details. Under reasonable conditions, the discussed model can provide a mechanism to realize, in higher-dimensions （d 〉 4）, the accelerated expansion of the universe in the presence of dark energy, without the presence of phantom energy and without the contraction of some internal dimension.

关键词： COSMOLOGICAL CONSTANT CHAPLYGIN-GAS DARK ENERGY QUINTESSENCE SUPERNOVAE PLANETS OMEGA

Phase Transitions in the Early Universe with Negatively Induced Supergravity Cosmological Constant

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2006年第5期23卷 1124-1127页

作者： EL-nabulsi ahmad rami Plasma Application Laboratory Department of Nuclear and Energy Engineering and Faculty of Mechanical Energy and Production Engineering Cheju National University Ara-dong 1 Jeju 690-756 South Korea

We consider that the observable cosmological constant is the sum of the vacuum （Avac） and the induced term （Aind - 3m^2/4） with m being the ultra-llght masses （≈ Hubble parameter） implemented in the theory from supergravities arguments and non-minimal coupling. In the absence of a scalar buildup of matter fields, we study its effects on spontaneous symmetry breaking with a Higgs potential and show how the presence of the ultra-light masses yields some important consequences for the early universe and new constraints on the Higgs and electroweak gauge bosons masses.

关键词： SPONTANEOUS SYMMETRY-BREAKING MASSLESS PARTICLES CURVED SPACETIME GAUGE-THEORIES CURVATURE MODELS FIELD

Extra-Dimensional Cosmology with a Traversable Wormhole

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2009年第9期26卷 37-40页

作者： EL-nabulsi ahmad rami Department of Nuclear and Energy Engineering Cheju National University Ara-dong 1 Jeju 690-756 South Korea

We discuss many interesting and attractive features of a higher-dimensional cosmology with a static traversable wormhole dominated by a variable effective cosmological constant depending on the scale factor aft） as A... 详细信息

关键词： sea surface nonliear interaction numerical method

Accelerated Dilatonic-Brans-Dicke cyclic and non-singular universe from string theory

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2011年第11期11卷 1249-1256页

作者： ahmad rami El-nabulsi Department of Nuclear Engineering Cheju National UniversityAra-dong 1Jeju 690-756South Korea Key Laboratory of Numerical Simulation of Sichuan Province College of Mathematics and Information Science Neijiang Normal University

We discuss the late-time dynamics of a particular four-dimensional Brans-Dicke cosmology with a dilaton field motivated by string theories （solitonic p-branes or D-branes） in which the dilaton field and the scale factor of the fiat, homogeneous spacetime are correlated. We examine the late-time-evolution of the equations of motion where various attractive consequences are revealed artd discussed in some detail.

关键词： cosmology: theory-cosmological parameters

Gravitational Field as a Pressure Force from Logarithmic Lagrangians and Non-Standard Hamiltonians：The Case of Stellar Halo of Milky Way

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2018年第3期69卷 233-240页

作者： rami ahmad El-nabulsi Athens Institute for Education and Research Mathematics and Physics Divisions 8 Valaoritou Street Kolonaki 10671 Athens Greece

Recently,the notion of non-standard Lagrangians was discussed widely in literature in an attempt to explore the inverse variational problem of nonlinear differential *** forms of non-standard Lagrangians were introduced in literature and have revealed nice mathematical and physical *** interesting form related to the inverse variational problem is the logarithmic Lagrangian,which has a number of motivating features related to the Li′enard-type and Emden nonlinear differential *** types of Lagrangians lead to nonlinear dynamics based on non-standard *** this communication,we show that some new dynamical properties are obtained in stellar dynamics if standard Lagrangians are replaced by Logarithmic Lagrangians and their corresponding non-standard *** interesting consequence concerns the emergence of an extra pressure term,which is related to the gravitational field suggesting that gravitation may act as a pressure in a strong gravitational *** case of the stellar halo of the Milky Way is considered.

关键词： logarithmic Lagrangian non-standard Hamiltonians modified Boltzmann equation stellar dynamics Milky way

Dark energy in five-dimensional Brans-Dicke cosmology with dimensional reduction

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2011年第8期11卷 888-894页

作者： ahmad rami El-nabulsi Department of Nuclear Engineering Cheju National University South Korea College of Mathematics and Information Sciences Neijiang Normal University

We explore a 5D Brans-Dicke scalar cosmology by conjecturing that the four-dimensional Hubble parameter varies as H = εФ^s, ε ∈ R and s is some unknown power index and that the extra-dimensions compactify as the visible dimensions expand as b（t） ≈ a^x （t）, x ∈R^-. We mainly discuss the case x = - 1. For critical values of e close to unity, it was observed that the acceleration of the universe occurs at red- shift close to z = 0.8 which indicates that in our model, accelerated expansion of the universe began only recently. Several interesting points are revealed and discussed in some detail.

关键词： Brans-Dicke cosmology -- dark energy

Scalar Tensor Cosmology With Kinetic, Gauss-Bonnet and Nonminimal Derivative Couplings and Supersymmetric Loop Corrected Potential

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2019年第7期71卷 831-836页

作者： rami ahmad El-nabulsi Athens Institute for Education and Research Mathematics and Physics Divisions8 Valaoritou StreetKolonaki 10671 AthensGreece

We discuss a particular four-dimensional cosmology based on non-minimal scalar tensor theories characterized by a supersymmetric loop corrected potential and a Hubble parameter defined as a function of the scalar ***-law solutions are obtained in the FRW background giving rise to acceleratedly expanding universe characterized by a scale factor and a scalar field depending both on the non-minimal coupling parameterξ.Based on SNeia data and on Hubble data X-ray gas mass fraction measurements,we find 0.116<ξ<0.225 which results on a universe dominated by vacuum energy.

关键词： scalar tensor cosmology Gauss-Bonnet coupling non-minimal derivative coupling vacuum energy

Generalized uncertainty principle from long-range kernel effects:The case of the Hawking black hole temperature

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2023年第9期32卷 153-156页

作者： rami ahmad El-nabulsi Waranont Anukool Center of Excellence in Quantum Technology Faculty of EngineeringChiang Mai UniversityChiang Mai 50200Thailand Quantum-Atom Optics Laboratory and Research Center for Quantum Technology Faculty of ScienceChiang Mai UniversityChiang Mai 50200Thailand Department of Physics and Materials Science Faculty of ScienceChiang Mai UniversityChiang Mai 50200Thailand Institute of Hydrobiology Biology Centre of the Czech Academy of SciencesČeskéBudějoviceCzech Republic

We prove the existence of an analogy between spatial long-range interactions,which are of the convolution-type introduced in non-relativistic quantum mechanics,and the generalized uncertainty principle predicted from quantum gravity *** an illustration,black hole temperature effects are *** is observed that for specific choices of the moment's kernels,cold black holes may emerge in the theory.

关键词： long-range kernel effects generalized uncertainty principle

Charged Randall-Sundrum Braneworld Type Ⅱ with Higher Order Curvature Corrections from Superstring Arguments and Dominated by Quintessence

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2010年第5期53卷 869-881页

作者： EL-nabulsi ahmad rami Department of Nuclear and Energy Engineering Cheju National University

We discuss a new class of RSII braneworld cosmology exhibiting accelerated expansion and dominated by quintessence. It is explicitly demonstrated that the universe expansion history （transition from inflation to deceleration epoch to acceleration and effective quintessence era） may naturally occur in such unified theory for some classes of inverse scalar potentials. Besides a decaying effective cosmological constant, the model incorporates an increasing black hole mass, an increasing Maxwellian electrical charge with cosmic time and a time-dependent brahe tension. The cosmological model exhibits several features of cosmological and astrophysical interest for both the early and late universe consistent with recent observations, in particular the ones concerned with the gravitational constants, black holes masses and charges and variation of the gauge coupling parameters with cosmic time. One interesting mark of the constructed model concerns the fact that a black hole mass surrounded by quintessence energy may increase with time even if the horizon disappears.

关键词： brane world RSII cosmology higher order curvature corrections black hole black strings effective cosmological constant Maxwellian charge quintessence accelerated expansion