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  Subjects -> EARTH SCIENCES (Total: 579 journals)
    - EARTH SCIENCES (427 journals)
    - GEOLOGY (64 journals)
    - GEOPHYSICS (27 journals)
    - HYDROLOGY (17 journals)
    - OCEANOGRAPHY (44 journals)

EARTH SCIENCES (427 journals)                  1 2 3 4 5 | Last

Acta Geodaetica et Geophysica     Hybrid Journal   (1 follower)
Acta Geodaetica et Geophysica Hungarica     Full-text available via subscription   (2 followers)
Acta Geophysica     Hybrid Journal   (7 followers)
Acta Geotechnica     Hybrid Journal   (9 followers)
Acta Meteorologica Sinica     Hybrid Journal   (2 followers)
Advances in High Energy Physics     Open Access   (12 followers)
Advances In Physics     Hybrid Journal   (6 followers)
Aeolian Research     Hybrid Journal   (1 follower)
African Journal of Aquatic Science     Hybrid Journal   (13 followers)
Algological Studies     Full-text available via subscription   (2 followers)
Alpine Botany     Hybrid Journal   (2 followers)
AMBIO     Hybrid Journal   (13 followers)
Anales del Instituto de la Patagonia     Open Access   (2 followers)
Andean geology     Open Access   (5 followers)
Annales Henri Poincaré     Hybrid Journal   (2 followers)
Annales UMCS, Geographia, Geologia, Mineralogia et Petrographia     Open Access   (1 follower)
Annals of Geophysics     Full-text available via subscription   (9 followers)
Annals of GIS     Hybrid Journal   (15 followers)
Annals of Glaciology     Full-text available via subscription  
Annual Review of Marine Science     Full-text available via subscription   (9 followers)
Applied Clay Science     Hybrid Journal   (2 followers)
Applied Geochemistry     Hybrid Journal   (6 followers)
Applied Geomatics     Hybrid Journal   (6 followers)
Applied Geophysics     Hybrid Journal   (6 followers)
Applied Ocean Research     Hybrid Journal   (6 followers)
Applied Petrochemical Research     Open Access   (3 followers)
Applied Remote Sensing Journal     Open Access   (5 followers)
Aquatic Conservation Marine and Freshwater Ecosystems     Hybrid Journal   (19 followers)
Arctic, Antarctic, and Alpine Research     Full-text available via subscription   (6 followers)
Artificial Satellites     Open Access   (11 followers)
Asia-Pacific Journal of Atmospheric Sciences     Hybrid Journal   (2 followers)
Asian Journal of Earth Sciences     Open Access   (16 followers)
Atlantic Geology : Journal of the Atlantic Geoscience Society / Atlantic Geology : revue de la Société Géoscientifique de l'Atlantique     Full-text available via subscription   (3 followers)
Atmosphere-Ocean     Full-text available via subscription   (3 followers)
Atmospheric and Climate Sciences     Open Access   (14 followers)
Australian Journal of Earth Sciences: An International Geoscience Journal of the Geological Society of Australia     Hybrid Journal   (11 followers)
Boletim de Ciências Geodésicas     Open Access  
Boreas: An International Journal of Quaternary Research     Hybrid Journal   (7 followers)
Bragantia     Open Access   (2 followers)
Bulletin of Earthquake Engineering     Hybrid Journal   (9 followers)
Bulletin of Geosciences     Open Access   (7 followers)
Bulletin of Marine Science     Full-text available via subscription   (12 followers)
Bulletin of the Lebedev Physics Institute     Hybrid Journal   (2 followers)
Bulletin of the Seismological Society of America     Full-text available via subscription   (15 followers)
Bulletin of Volcanology     Hybrid Journal   (11 followers)
Canadian Journal of Plant Science     Full-text available via subscription   (10 followers)
Canadian Mineralogist     Full-text available via subscription   (1 follower)
Canadian Water Resources Journal     Hybrid Journal   (17 followers)
Carbonates and Evaporites     Hybrid Journal   (3 followers)
CATENA     Hybrid Journal   (3 followers)
Central European Journal of Geosciences     Hybrid Journal   (5 followers)
Central European Journal of Physics     Hybrid Journal   (2 followers)
Chemical Geology     Hybrid Journal   (9 followers)
Chemie der Erde - Geochemistry     Hybrid Journal   (3 followers)
Chinese Geographical Science     Hybrid Journal   (3 followers)
Chinese Journal of Geochemistry     Hybrid Journal   (2 followers)
Chinese Journal of Oceanology and Limnology     Hybrid Journal   (3 followers)
Ciencia del suelo     Open Access  
Climate and Development     Hybrid Journal   (8 followers)
Coastal Management     Hybrid Journal   (17 followers)
Comptes Rendus Geoscience     Full-text available via subscription   (5 followers)
Computational Geosciences     Hybrid Journal   (11 followers)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (2 followers)
Computers and Geotechnics     Hybrid Journal   (6 followers)
Continental Journal of Earth Sciences     Open Access   (1 follower)
Continental Shelf Research     Hybrid Journal   (6 followers)
Contributions to Mineralogy and Petrology     Hybrid Journal   (7 followers)
Contributions to Plasma Physics     Hybrid Journal   (2 followers)
Coral Reefs     Hybrid Journal   (17 followers)
Cretaceous Research     Hybrid Journal   (3 followers)
Cybergeo : European Journal of Geography     Open Access   (3 followers)
Developments in Geotectonics     Full-text available via subscription   (1 follower)
Developments in Quaternary Science     Full-text available via subscription   (3 followers)
Développement durable et territoires     Open Access   (2 followers)
Diatom Research     Hybrid Journal  
Doklady Physics     Hybrid Journal   (2 followers)
Dynamics of Atmospheres and Oceans     Hybrid Journal   (3 followers)
E3S Web of Conferences     Open Access  
Earth and Planetary Science Letters     Hybrid Journal   (95 followers)
Earth Interactions     Full-text available via subscription   (7 followers)
Earth Science Research     Open Access   (5 followers)
Earth Surface Processes and Landforms     Hybrid Journal   (10 followers)
Earth System Dynamics     Open Access   (4 followers)
Earth System Dynamics Discussions     Open Access   (3 followers)
Earth's Future     Open Access   (1 follower)
Earthquake Engineering and Engineering Vibration     Hybrid Journal   (7 followers)
Earthquake Spectra     Full-text available via subscription   (11 followers)
Ecohydrology     Hybrid Journal   (11 followers)
Ecological Questions     Open Access   (5 followers)
Electromagnetics     Hybrid Journal   (2 followers)
Energy Efficiency     Hybrid Journal   (9 followers)
Energy Exploration & Exploitation     Full-text available via subscription   (2 followers)
Environmental Earth Sciences     Hybrid Journal   (10 followers)
Environmental Geology     Hybrid Journal   (10 followers)
Environmental Geosciences     Full-text available via subscription   (4 followers)
Erwerbs-Obstbau     Hybrid Journal  
Estuaries and Coasts     Hybrid Journal   (1 follower)
Estuarine, Coastal and Shelf Science     Hybrid Journal   (15 followers)
Estudios Geográficos     Open Access  
European Journal of Mineralogy     Full-text available via subscription   (6 followers)

        1 2 3 4 5 | Last

Advances in High Energy Physics    [14 followers]  Follow    
  This is an Open Access Journal Open Access journal
     ISSN (Print) 1687-7357 - ISSN (Online) 1687-7365
     Published by Hindawi Publishing Corporation Homepage  [347 journals]   [SJR: 1.297]   [H-I: 7]
  • Hubble Parameter Corrected Interactions in Cosmology
    • Abstract: We make steps in a new direction by considering fluids with EoS of more general form . It is thought that there should be interaction between cosmic fluids, but this assumption for this stage carries only phenomenological character opening a room for different kinds of manipulations. In this paper we will consider a modification of an interaction , where we accept that interaction parameter (order of unity) in is time dependent and presented as a linear function of Hubble parameter of the form , where and are constants. We consider two different models including modified Chaplygin gas and polytropic gas which have bulk viscosity. Then, we investigate problem numerically and analyze behavior of different cosmological parameters concerning fluids and behavior of the universe.
      PubDate: Mon, 14 Apr 2014 11:07:30 +000
       
  • Transverse Momentum Distributions in AuAu and dAu Collisions at  GeV
    • Abstract: We study the transverse momentum distributions of identified particles produced in Au + Au and d + Au collisions at  GeV. The Tsallis description is applied in the multisource model. The results are compared with the experimental data in detail. We obtain some information of the thermodynamic properties of matter produced in the collisions. The difference of the transverse momentum distributions in Au + Au and d + Au collisions is not significant.
      PubDate: Thu, 10 Apr 2014 10:10:33 +000
       
  • Comparing Multicomponent Erlang Distribution and Lévy Distribution of
           Particle Transverse Momentums
    • Abstract: The transverse momentum spectrums of final-state products produced in nucleus-nucleus and proton-proton collisions at different center-of-mass energies are analyzed by using a multicomponent Erlang distribution and the Lévy distribution. The results calculated by the two models are found in most cases to be in agreement with experimental data from the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC). The multicomponent Erlang distribution that resulted from a multisource thermal model seems to give a better description as compared with the Lévy distribution. The temperature parameters of interacting system corresponding to different types of final-state products are obtained. Light particles correspond to a low temperature emission, and heavy particles correspond to a high temperature emission. Extracted temperature from central collisions is higher than that from peripheral collisions.
      PubDate: Thu, 10 Apr 2014 00:00:00 +000
       
  • Analyzing the Anomalous Dipole Moment Type Couplings of Heavy Quarks with
           FCNC Interactions at the CLIC
    • Abstract: We examine both anomalous magnetic and dipole moment type couplings of a heavy quark via its single production with subsequent dominant standard model decay modes at the compact linear collider (CLIC). The signal and background cross sections are analyzed for heavy quark masses 600 and 700 GeV. We make the analysis to delimitate these couplings as well as to find the attainable integrated luminosities for observation limit.
      PubDate: Wed, 09 Apr 2014 13:26:37 +000
       
  • What Can We Learn from (Pseudo)Rapidity Distribution in High Energy
           Collisions'
    • Abstract: Based on the (pseudo)rapidity distribution of final-state particles produced in proton-proton (pp) collisions at high energy, the probability distributions of momenta, longitudinal momenta, transverse momenta (transverse masses), energies, velocities, longitudinal velocities, transverse velocities, and emission angles of the considered particles are obtained in the framework of a multisource thermal model. The number density distributions of particles in coordinate and momentum spaces and related transverse planes, the particle dispersion plots in longitudinal and transverse coordinate spaces, and the particle dispersion plots in transverse momentum plane at the stage of freeze out in high energy pp collisions are also obtained.
      PubDate: Tue, 08 Apr 2014 07:05:25 +000
       
  • Shower and Slow Particle Productions in Nucleus-Nucleus Collisions at High
           Energy
    • Abstract: The multiplicity distributions of shower, grey, and black particles produced in interactions of 4He, 12C, 16O, 22Ne, and 28Si with emulsion (Em) at 4.1–4.5 A GeV/c beam energies, and their dependence on target groups (H, CNO, and AgBr) is presented and has been reproduced by multisource thermal model. The multiplicity and the angular distributions of the three types of particles have been investigated. The experimental results are compared with the corresponding ones from the model. We found that the experimental data agrees with theoretical calculations using multisource thermal model.
      PubDate: Mon, 07 Apr 2014 09:02:44 +000
       
  • The Evolution-Dominated Hydrodynamic Model and the Pseudorapidity
           Distributions in High Energy Physics
    • Abstract: By taking into account the effects of leading particles, we discuss the pseudorapidity distributions of the charged particles produced in high energy heavy ion collisions in the context of evolution-dominated hydrodynamic model. The leading particles are supposed to have a Gaussian rapidity distribution normalized to the number of participants. A comparison is made between the theoretical results and the experimental measurements performed by BRAHMS and PHOBOS Collaboration at BNL-RHIC in Au-Au and Cu-Cu collisions at  GeV and by ALICE Collaboration at CERN-LHC in Pb-Pb collisions at  TeV.
      PubDate: Thu, 03 Apr 2014 14:11:56 +000
       
  • Hermitian -Freudenthal-Kantor Triple Systems and Certain Applications of
           *-Generalized Jordan Triple Systems to Field Theory
    • Abstract: We define Hermitian -Freudenthal-Kantor triple systems and prove a structure theorem. We also give some examples of triple systems that are generalizations of the and Hermitian 3-algebras. We apply a -generalized Jordan triple system to a field theory and obtain a Chern-Simons gauge theory. We find that the novel Higgs mechanism works, where the Chern-Simons gauge theory reduces to a Yang-Mills theory in a certain limit.
      PubDate: Thu, 03 Apr 2014 09:57:27 +000
       
  • Analyzing Black Hole Super-Radiance Emission of Particles/Energy from a
           Black Hole as a Gedankenexperiment to Get Bounds on the Mass of a Graviton
           
    • Abstract: Use of super-radiance in BH physics, so specifies conditions for a mass of a graviton being less than or equal to 1065 grams, allows for determing what role additional dimensions may play in removing the datum that massive gravitons lead to 3/4th the bending of light past the planet Mercury. The present document makes a given differentiation between super-radiance in the case of conventional BHs and Braneworld BH super-radiance, which may delineate whether Braneworlds contribute to an admissible massive graviton in terms of removing the usual problem of the 3/4th the bending of light past the planet Mercury which is normally associated with massive gravitons. This leads to a fork in the road between two alternatives with the possibility of needing a multiverse containment of BH structure or embracing what Hawkings wrote up recently, namely, a redo of the event horizon hypothesis as we know it.
      PubDate: Thu, 03 Apr 2014 09:27:31 +000
       
  • Studies of Three-Body Decay of to and to *
    • Abstract: We investigate the and decay by using the Dalitz plot analysis. As we know there are tree, penguin, emission, and emission-annihilation diagrams for these decay modes in the factorization approach. The transition matrix element is factorized into a form factor multiplied by decay constant and also a form factor multiplied by decay constant. According to QCD factorization approach and using the Dalitz plot analysis, we calculate the branching ratios of the and three-body decay in view of the mixing and obtain the value of the , while the experimental results of them are and , respectively. In this research we also analyze the decay which is similar to the previous decay, but there is no experimental data for the last decay. Since for calculations of the decay we use assumptions of the decay, we hope that if this decay will be measured by the LHCb in the future, the experimental results will be in agreement with our calculations.
      PubDate: Thu, 03 Apr 2014 00:00:00 +000
       
  • Magnetic String with a Nonlinear Source
    • Abstract: Considering the Einstein gravity in the presence of Born-Infeld type electromagnetic fields, we introduce a class of 4-dimensional static horizonless solutions which produce longitudinal magnetic fields. Although these solutions do not have any curvature singularity and horizon, there exists a conic singularity. We investigate the effects of nonlinear electromagnetic fields on the properties of the solutions and find that the asymptotic behavior of the solutions is adS. Next, we generalize the static metric to the case of rotating solutions and find that the value of the electric charge depends on the rotation parameter. Furthermore, conserved quantities will be calculated through the use of the counterterm method. Finally, we extend four-dimensional magnetic solutions to higher dimensional solutions. We present higher dimensional rotating magnetic branes with maximum rotation parameters and obtain their conserved quantities.
      PubDate: Wed, 02 Apr 2014 14:16:28 +000
       
  • Holographic Brownian Motion in Three-Dimensional Gödel Black Hole
    • Abstract: By using the AdS/CFT correspondence and Gödel black hole background, we study the dynamics of heavy quark under a rotating plasma. In that case we follow Atmaja (2013) about Brownian motion in BTZ black hole. In this paper we receive some new results for the case of . In this case, we must redefine the angular velocity of string fluctuation. We obtain the time evolution of displacement square and angular velocity and show that it behaves as a Brownian particle in non relativistic limit. In this plasma, it seems that relating the Brownian motion to physical observables is rather a difficult work. But our results match with Atmaja work in the limit .
      PubDate: Wed, 02 Apr 2014 11:38:36 +000
       
  • A New Flavor Symmetry in 3-3-1 Model with Neutral Fermions
    • Abstract: A new S4 flavor model based on gauge symmetry responsible for fermion masses and mixings is constructed. The neutrinos get small masses from only an antisextet of SU(3)L which is in a doublet under S4. In this work, we assume the VEVs of the antisextet differ from each other under S4 and the difference of these VEVs is regarded as a small perturbation, and then the model can fit the experimental data on neutrino masses and mixings. Our results show that the neutrino masses are naturally small and a deviation from the tribimaximal neutrino mixing form can be realized. The quark masses and mixing matrix are also discussed. The number of required Higgs multiplets is less and the scalar potential of the model is simpler than those of the model based on S3 and our previous S4 model. The assignation of VEVs to antisextet leads to the mixing of the new gauge bosons and those in the standard model. The mixing in the charged gauge bosons as well as the neutral gauge bosons is considered.
      PubDate: Wed, 02 Apr 2014 09:02:35 +000
       
  • How Can the Modified Dispersion Relation Affect Friedmann Equations'
    • Abstract: The appearance of the quantum gravitational effects in a very high energy regime necessitates some corrections to the thermodynamics of Friedmann-Robertson-Walker (FRW) universe. The modified dispersion relation (MDR) as a phenomenological approach to investigate the high energy physics provides a perturbation framework upon which the FRW universe thermodynamics can be corrected. In this letter, we obtain the corrected entropy-area relation of the apparent horizon of FRW universe by utilizing the extra dimensional form of MDR, leading to the modification of Friedmann equations. The influence of MDR on the Friedmann equations provides a good insight into the understanding of the FRW universe dynamics in the final quantum gravity theory.
      PubDate: Tue, 01 Apr 2014 13:42:45 +000
       
  • MicroBlack Holes Thermodynamics in the Presence of Quantum Gravity Effects
    • Abstract: Black hole thermodynamics is corrected in the presence of quantum gravity effects. Some phenomenological aspects of quantum gravity proposal can be addressed through generalized uncertainty principle (GUP) which provides a perturbation framework to perform required modifications of the black hole quantities. In this paper, we consider the effects of both a minimal measurable length and a maximal momentum on the thermodynamics of TeV-scale black holes. We then extend our study to the case that there are all natural cutoffs as minimal length, minimal momentum, and maximal momentum simultaneously. We also generalize our study to the model universes with large extra dimensions (LED). In this framework existence of black holes remnants as a possible candidate for dark matter is discussed. We study probability of black hole production in the Large Hadronic Collider (LHC) and we show this rate decreasing for sufficiently large values of the GUP parameter.
      PubDate: Tue, 01 Apr 2014 10:18:41 +000
       
  • Halo-Independent Comparison of Direct Dark Matter Detection Data
    • Abstract: We review the halo-independent formalism that allows comparing data from different direct dark matter detection experiments without making assumptions on the properties of the dark matter halo. We apply this method to spin-independent WIMP-nuclei interactions, for both isospin-conserving and isospin-violating couplings, and to WIMPs interacting through an anomalous magnetic moment.
      PubDate: Tue, 01 Apr 2014 06:57:39 +000
       
  • Neutrino Masses and Oscillations
    • PubDate: Sun, 30 Mar 2014 12:53:53 +000
       
  • Black Component of Dark Matter
    • Abstract: A mechanism of primordial black hole formation with specific mass spectrum is discussed. It is shown that these black holes could contribute to the energy density of dark matter. Our approach is elaborated in the framework of universal extra dimensions.
      PubDate: Sun, 30 Mar 2014 11:32:32 +000
       
  • NMC and the Fine-Tuning Problem on the Brane
    • Abstract: We propose a new solution to the fine-tuning problem related to coupling constant of the potential. We study a quartic potential of the form in 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 . 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 parameter and brane tension , we can eliminate the fine-tuning problem. Finally, we present graphically the solutions of several values of the free parameters of the model.
      PubDate: Sun, 30 Mar 2014 10:17:19 +000
       
  • Double-Differential Production Cross Sections of Charged Pions in Charged
           Pion Induced Nuclear Reactions at High Momentums
    • Abstract: The double-differential production cross sections in interactions of charged pions on targets at high momentums are analyzed by using a multicomponent Erlang distribution which is obtained in the framework of a multisource thermal model. The calculated results are compared and found to be in agreement with the experimental data at the incident momentums of 3, 5, 8, and 12 GeV/c measured by the HARP Collaboration. It is found that the source contributions to the mean momentum of charged particles and to the distribution width of particle momentums decrease with increase of the emission angle, and the source number and temperature do not show an obvious dependence on the emission angle of the considered particle.
      PubDate: Sun, 30 Mar 2014 07:19:56 +000
       
  • Holographic Screens in Ultraviolet Self-Complete Quantum Gravity
    • Abstract: This paper studies the geometry and the thermodynamics of a holographic screen in the framework of the ultraviolet self-complete quantum gravity. To achieve this goal we construct a new static, neutral, nonrotating black hole metric, whose outer (event) horizon coincides with the surface of the screen. The spacetime admits an extremal configuration corresponding to the minimal holographic screen and having both mass and radius equalling the Planck units. We identify this object as the spacetime fundamental building block, whose interior is physically unaccessible and cannot be probed even during the Hawking evaporation terminal phase. In agreement with the holographic principle, relevant processes take place on the screen surface. The area quantization leads to a discrete mass spectrum. An analysis of the entropy shows that the minimal holographic screen can store only one byte of information, while in the thermodynamic limit the area law is corrected by a logarithmic term.
      PubDate: Thu, 27 Mar 2014 07:26:37 +000
       
  • Challenges in Double Beta Decay
    • Abstract: In the past ten years, neutrino oscillation experiments have provided the incontrovertible evidence that neutrinos mix and have finite masses. These results represent the strongest demonstration that the electroweak Standard Model is incomplete and that new Physics beyond it must exist. In this scenario, a unique role is played by the Neutrinoless Double Beta Decay searches which can probe lepton number conservation and investigate the Dirac/Majorana nature of the neutrinos and their absolute mass scale (hierarchy problem) with unprecedented sensitivity. Today Neutrinoless Double Beta Decay faces a new era where large-scale experiments with a sensitivity approaching the so-called degenerate-hierarchy region are nearly ready to start and where the challenge for the next future is the construction of detectors characterized by a tonne-scale size and an incredibly low background. A number of new proposed projects took up this challenge. These are based either on large expansions of the present experiments or on new ideas to improve the technical performance and/or reduce the background contributions. In this paper, a review of the most relevant ongoing experiments is given. The most relevant parameters contributing to the experimental sensitivity are discussed and a critical comparison of the future projects is proposed.
      PubDate: Wed, 26 Mar 2014 13:59:01 +000
       
  • Wormhole Solutions in the Presence of Nonlinear Maxwell Field
    • Abstract: In generalizing the Maxwell field to nonlinear electrodynamics, we look for the magnetic solutions. We consider a suitable real metric with a lower bound on the radial coordinate and investigate the properties of the solutions. We find that in order to have a finite electromagnetic field near the lower bound, we should replace the Born-Infeld theory with another nonlinear electrodynamics theory. Also, we use the cut-and-paste method to construct wormhole structure. We generalize the static solutions to rotating spacetime and obtain conserved quantities.
      PubDate: Wed, 26 Mar 2014 09:17:52 +000
       
  • Lepton Flavour Violation Experiments
    • Abstract: Lepton Flavour Violation in the charged lepton sector (CLFV) is forbidden in the Minimal Standard model and strongly suppressed in extensions of the model to include finite neutrino mixing. On the other hand, a wide class of Supersymmetric theories, even coupled with Grand Unification models (SUSY-GUT models), predict CLFV processes at a rate within the reach of new experimental searches operated with high resolution detectors at high intensity accelerators. As the Standard model background is negligible, the observation of one or more CLFV events would provide incontrovertible evidence for physics beyond Standard model, while a null effect would severely constrain the set of theory parameters. Therefore, a big experimental effort is currently (and will be for incoming years) accomplished to achieve unprecedented sensitivity on several CLFV processes. In this paper we review past and recent results in this research field, with focus on CLFV channels involving muons and tau's. We present currently operating experiments as well as future projects, with emphasis laid on how sensitivity enhancements are accompanied by improvements on detection techniques. Limitations due to systematic effects are also discussed in detail together with the solutions being adopted to overcome them.
      PubDate: Thu, 20 Mar 2014 12:50:29 +000
       
  • Black Holes and Quantum Mechanics
    • Abstract: We look at black holes from different, novel perspectives.
      PubDate: Thu, 20 Mar 2014 12:14:44 +000
       
  • Hulthén and Coulomb-Like Potentials as a Tensor Interaction within
           the Relativistic Symmetries of the Manning-Rosen Potential
    • Abstract: The bound-state solutions of the Dirac equation for the Manning-Rosen potential are presented approximately for arbitrary spin-orbit quantum number with the Hulthén and Coulomb-like potentials as a tensor interaction. The generalized parametric Nikiforov-Uvarov (NU) method is used to obtain energy eigenvalues and corresponding two-component spinors of the two Dirac particles and these are obtained in the closed form by using the framework of the spin symmetry and p-spin symmetry concept. We have also shown that tensor interaction removes degeneracies between spin and p-spin doublets. Some numerical results are also given.
      PubDate: Thu, 20 Mar 2014 09:03:04 +000
       
  • Theory and Phenomenology of Space-Time Defects
    • Abstract: Whether or not space-time is fundamentally discrete is of central importance for the development of the theory of quantum gravity. If the fundamental description of spacetime is discrete, typically represented in terms of a graph or network, then the apparent smoothness of geometry on large scales should be imperfect—it should have defects. Here, we review a model for space-time defects and summarize the constraints on the prevalence of these defects that can be derived from observation.
      PubDate: Thu, 20 Mar 2014 06:59:37 +000
       
  • Inflation and Topological Phase Transition Driven by Exotic Smoothness
    • Abstract: We will discuss a model which describes the cause of inflation by a topological transition. The guiding principle is the choice of an exotic smoothness structure for the space-time. Here we consider a space-time with topology . In case of an exotic , there is a change in the spatial topology from a 3-sphere to a homology 3-sphere which can carry a hyperbolic structure. From the physical point of view, we will discuss the path integral for the Einstein-Hilbert action with respect to a decomposition of the space-time. The inclusion of the boundary terms produces fermionic contributions to the partition function. The expectation value of an area (with respect to some surface) shows an exponential increase; that is, we obtain inflationary behavior. We will calculate the amount of this increase to be a topological invariant. Then we will describe this transition by an effective model, the Starobinski or model which is consistent with the current measurement of the Planck satellite. The spectral index and other observables are also calculated.
      PubDate: Wed, 19 Mar 2014 12:40:34 +000
       
  • Massless Weyl Spinors from Bosonic Scalar-Tensor Duality
    • Abstract: We consider the fermionization of a bosonic-free theory characterized by the scalar-tensor duality. This duality can be interpreted as the dimensional reduction, via a planar boundary, of the topological BF theory. In this model, adopting the Sommerfield tomographic representation of quantized bosonic fields, we explicitly build a fermionic operator and its associated Klein factor such that it satisfies the correct anticommutation relations. Interestingly, we demonstrate that this operator satisfies the massless Dirac equation and that it can be identified with a Weyl spinor. Finally, as an explicit example, we write the integrated charge density in terms of the tomographic transformed bosonic degrees of freedom.
      PubDate: Wed, 19 Mar 2014 11:45:47 +000
       
  • Cardy-Verlinde Formula of Noncommutative Schwarzschild Black Hole
    • Abstract: Few years ago, Setare (2006) has investigated the Cardy-Verlinde formula of noncommutative black hole obtained by noncommutativity of coordinates. In this paper, we apply the same procedure to a noncommutative black hole obtained by the coordinate coherent approach. The Cardy-Verlinde formula is entropy formula of conformal field theory in an arbitrary dimension. It relates the entropy of conformal field theory to its total energy and Casimir energy. In this paper, we have calculated the total energy and Casimir energy of noncommutative Schwarzschild black hole and have shown that entropy of noncommutative Schwarzschild black hole horizon can be expressed in terms of Cardy-Verlinde formula.
      PubDate: Tue, 18 Mar 2014 10:08:31 +000
       
 
 
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