Advances in High Energy Physics
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The latest articles from Hindawi Publishing Corporation
© 2014 , Hindawi Publishing Corporation . All rights reserved.

Study of Confinement/Deconfinement Transition in AdS/QCD with Generalized Warp Factors
Thu, 21 Aug 2014 11:14:14 +0000
http://www.hindawi.com/journals/ahep/2014/543526/
We study analytical solutions of charged black holes and thermally charged AdS with generalized warped factors in EinsteinMaxwellDilaton system. We calculate Euclidean action for charged AdS and thermally charged AdS. The actions in both backgrounds are regularized by the method of background subtraction. The study of phase transition between charged black hole and thermally charged AdS gives an insight into the confinement/deconfinement transition. The plots of grand potential versus temperature and chemical potential versus transition temperature are obtained.
Shobhit Sachan
Copyright © 2014 Shobhit Sachan. All rights reserved.

Lorentz Violation of the Photon Sector in Field Theory Models
Thu, 21 Aug 2014 06:30:58 +0000
http://www.hindawi.com/journals/ahep/2014/374572/
We compare the Lorentz violation terms of the pure photon sector between two field theory models, namely, the minimal standard model extension (SME) and the standard model supplement (SMS). From the requirement of the identity of the intersection for the two models, we find that the free photon sector of the SMS can be a subset of the photon sector of the minimal SME. We not only obtain some relations between the SME parameters but also get some constraints on the SMS parameters from the SME parameters. The CPTodd coefficients of the SME are predicted to be zero. There are 15 degrees of freedom in the Lorentz violation matrix of free photons of the SMS related with the same number of degrees of freedom in the tensor coefficients , which are independent from each other in the minimal SME but are interrelated in the intersection of the SMS and the minimal SME. With the related degrees of freedom, we obtain the conservative constraints on the elements of the photon Lorentz violation matrix. The detailed structure of the photon Lorentz violation matrix suggests some applications to the Lorentz violation experiments for photons.
Lingli Zhou and BoQiang Ma
Copyright © 2014 Lingli Zhou and BoQiang Ma. All rights reserved.

Slowly Rotating Black Holes with Nonlinear Electrodynamics
Wed, 20 Aug 2014 00:00:00 +0000
http://www.hindawi.com/journals/ahep/2014/390101/
We study charged slowly rotating black hole with a nonlinear electrodynamics (NED) in the presence of cosmological constant. Starting from the static solutions of EinsteinNED gravity as seed solutions, we use the angular momentum as the perturbative parameter to obtain slowly rotating black holes. We perform the perturbations up to the linear order for black holes in
4 dimensions. These solutions are asymptotically AdS and their horizon has spherical topology. We calculate the physical properties of these black holes and study their dependence on the rotation parameter as well as the nonlinearity parameter β. In the limit , the solution describes slowly rotating AdS type black holes.
S. H. Hendi and M. Allahverdizadeh
Copyright © 2014 S. H. Hendi and M. Allahverdizadeh. All rights reserved.

Initiating the Effective Unification of Black Hole Horizon Area and Entropy Quantization with QuasiNormal Modes
Tue, 19 Aug 2014 06:33:37 +0000
http://www.hindawi.com/journals/ahep/2014/530547/
Black hole (BH) area quantization may be the key to unlocking a
unifying theory of quantum gravity (QG). Surmounting evidence in the
field of BH research continues to support a horizon (surface) area with
a discrete and uniformly spaced spectrum, but there is still no general
agreement on the level spacing. In the specialized and important BH case
study, our objective is to report and examine the pertinent groundbreaking
work of the strictly thermal and nonstrictly thermal spectrum level
spacing of the BH horizon area quantization with included entropy calculations,
which aims to tackle this gigantic problem. In particular, such
work exemplifies a series of imperative corrections that eventually permits
a BH’s horizon area spectrum to be generalized from strictly thermal to nonstrictly thermal with entropy results, thereby capturing multiple preceding
developments by launching an effective unification between them.
Moreover, the results are significant because quasinormal modes (QNM)
and “effective states” characterize the transitions between the established
levels of the nonstrictly thermal spectrum.
C. Corda, S. H. Hendi, R. Katebi, and N. O. Schmidt
Copyright © 2014 C. Corda et al. All rights reserved.

The LowScale Approach to Neutrino Masses
Thu, 14 Aug 2014 13:46:34 +0000
http://www.hindawi.com/journals/ahep/2014/831598/
In this short review we revisit the broad landscape of lowscale models of neutrino mass generation, with view on their phenomenological potential. This includes signatures associated to direct neutrino mass messenger production at the LHC, as well as messengerinduced lepton flavor violation processes. We also briefly comment on the presence of WIMP cold dark matter candidates.
Sofiane M. Boucenna, Stefano Morisi, and José W. F. Valle
Copyright © 2014 Sofiane M. Boucenna et al. All rights reserved.

Dihadron Azimuthal Correlations in 200 GeV AuAu and 2.76 TeV PbPb Collisions
Wed, 13 Aug 2014 12:08:31 +0000
http://www.hindawi.com/journals/ahep/2014/870614/
In a multisource thermal model, we detailedly show dihadron azimuthal correlations for 20–40% and 50–80% in AuAu collisions at GeV and over a centrality range from 10–15% to 70–80% in PbPb collisions at TeV. The model can approximately describe the azimuthal correlations of particles produced in the collisions. The amplitude of the corresponding source is magnified, and the source translates along the direction. The factor , in most cases, increases with the increase of the centrality in PbPb collisions at TeV.
G. X. Zhang, Y. C. Qian, and B. C. Li
Copyright © 2014 G. X. Zhang et al. All rights reserved.

Analytical Solution of the Schrödinger Equation with Spatially Varying Effective Mass for Generalised Hylleraas Potential
Mon, 11 Aug 2014 00:00:00 +0000
http://www.hindawi.com/journals/ahep/2014/952597/
We have obtained exact solution of the effective mass Schrödinger equation for the generalised Hylleraas potential. The exact bound state energy eigenvalues and corresponding eigenfunctions are presented. The bound state eigenfunctions are obtained in terms of the hypergeometric functions. Results are also given for the special case of potential parameter.
Sanjib Meyur, Smarajit Maji, and S. Debnath
Copyright © 2014 Sanjib Meyur et al. All rights reserved.

Transport Coefficients for Holographic Hydrodynamics at Finite Energy Scale
Sun, 10 Aug 2014 09:04:26 +0000
http://www.hindawi.com/journals/ahep/2014/915312/
We investigate the relations between black hole thermodynamics and holographic transport coefficients in this paper. The formulae for DC conductivity and diffusion coefficient are verified for electrically singlecharged black holes. We examine the correctness of the proposed expressions by taking charged dilatonic and singlecharged STU black holes as two concrete examples, and compute the flows of conductivity and diffusion coefficient by solving the linear order perturbation equations. We then check the consistence by evaluating the BrownYork tensor at a finite radial position. Finally, we find that the retarded Green functions for the shear modes can be expressed easily in terms of black hole thermodynamic quantities and transport coefficients.
XianHui Ge, HongQiang Leng, Li Qing Fang, and GuoHong Yang
Copyright © 2014 XianHui Ge et al. All rights reserved.

Rough Mirror as a Quantum State Selector: Analysis and Design
Mon, 04 Aug 2014 11:42:13 +0000
http://www.hindawi.com/journals/ahep/2014/764182/
We report analysis of rough mirrors used as the gravitational state selectors in neutron beam and similar experiments. The key to mirror properties is its roughness correlation function (CF) which is extracted from the precision optical scanning measurements of the surface profile. To identify CF in the presence of fluctuationdriven fat tails, we perform numerical experiments with computergenerated random surfaces with the known CF. These numerical experiments provide a reliable identification procedure which we apply to the actual rough mirror. The extracted CF allows us to make predictions for ongoing GRANIT experiments. We also propose a radically new design for rough mirrors based on Monte Carlo simulations for the 1D Ising model. The implementation of this design provides a controlled environment with predictable scattering properties.
M. Escobar, F. Lamy, A. E. Meyerovich, and V. V. Nesvizhevsky
Copyright © 2014 M. Escobar et al. All rights reserved.

Performance of WaterBased Liquid Scintillator: An Independent Analysis
Thu, 24 Jul 2014 11:39:57 +0000
http://www.hindawi.com/journals/ahep/2014/250646/
The waterbased liquid scintillator (WbLS) is a new material currently under development. It is based on the idea of dissolving the organic scintillator in water using special surfactants. This material strives to achieve the novel detection techniques by combining the Cerenkov rings and scintillation light, as well as the total cost reduction compared to pure liquid scintillator (LS). The independent light yield measurement analysis for the light yield measurements using three different proton beam energies (210 MeV, 475 MeV, and 2000 MeV) for water, two different WbLS formulations (0.4% and 0.99%), and pure LS conducted at Brookhaven National Laboratory, USA, is presented. The results show that a goal of ~100 optical photons/MeV, indicated by the simulation to be an optimal light yield for observing both the Cerenkov ring and the scintillation light from the proton decay in a large water detector, has been achieved.
D. Beznosko, A. Batyrkhanov, A. Duspayev, A. Iakovlev, and M. Yessenov
Copyright © 2014 D. Beznosko et al. All rights reserved.

Quantized Ultracold Neutrons in Rough Waveguides: GRANIT Experiments and Beyond
Wed, 23 Jul 2014 09:27:48 +0000
http://www.hindawi.com/journals/ahep/2014/185414/
We apply our general theory of transport in systems with random rough boundaries to gravitationally quantized ultracold neutrons in rough waveguides as in GRANIT experiments (ILL, Grenoble). We consider waveguides with roughness in both two and one dimensions (2D and 1D). In the biased diffusion approximation the depletion times for the gravitational quantum states can be easily expressed via each other irrespective of the system parameters. The calculation of the exit neutron count reduces to evaluation of a single constant which contains a complicated integral of the correlation function of surface roughness. In the case of 1D roughness (random grating) this constant is calculated analytically for common types of the correlation functions. The results obey simple scaling relations which are slightly different in 1D and 2D. We predict the exit neutron count for the new GRANIT cell.
M. Escobar and A. E. Meyerovich
Copyright © 2014 M. Escobar and A. E. Meyerovich. All rights reserved.

InPile 4He Source for UCN Production at the ESS
Wed, 23 Jul 2014 08:26:15 +0000
http://www.hindawi.com/journals/ahep/2014/241639/
ESS will be a premier neutron source facility. Unprecedented neutron beam intensities are ensured by spallation reactions of a 5 MW, 2.0 GeV proton beam impinging on a tungsten target equipped with advanced moderators. The work presented here aims at investigating possibilities for installing an ultra cold neutron (UCN) source at the ESS. One consequence of using the recently proposed flat moderators is that they take up less space than the moderators originally foreseen and thus leave more freedom to design a UCN source, close to the spallation hotspot. One of the options studied is to place a large 4He UCN source in a throughgoing tube which penetrates the shielding below the target. First calculations of neutron flux available for UCN production are given, along with heatload estimates. It is estimated that the flux can give rise to a UCN production at a rate of up to UCN/s. A production in this range potentially allows for a number of UCN experiments to be carried out at unprecedented precision, including, for example, quantum gravitational spectroscopy with UCNs which rely on high phasespace density.
Esben Klinkby, Konstantin Batkov, Ferenc Mezei, Eric Pitcher, Troels Schönfeldt, Alan Takibayev, and Luca Zanini
Copyright © 2014 Esben Klinkby et al. All rights reserved.

Proposal to Search for a Dark Photon in Positron on Target Collisions at DANE Linac
Tue, 22 Jul 2014 12:04:23 +0000
http://www.hindawi.com/journals/ahep/2014/959802/
Photonlike particles are predicted in many extensions of the Standard Model. They have interactions similar to the photon, are vector bosons, and can be produced together with photons. The present paper proposes a search for such particles in the process in a positronontarget experiment, exploiting the positron beam of the DANE linac at the Laboratori Nazionali di Frascati, INFN. In one year of running a sensitivity in the relative interaction strength down to ~10−6 is achievable, in the mass region from 2.5 MeV. The proposed experimental setup and the analysis technique are discussed.
Mauro Raggi and Venelin Kozhuharov
Copyright © 2014 Mauro Raggi and Venelin Kozhuharov. All rights reserved.

Heavy Scalar, Vector, and AxialVector Mesons in Hot and Dense Nuclear Medium
Tue, 22 Jul 2014 11:23:37 +0000
http://www.hindawi.com/journals/ahep/2014/549726/
In this work we shall investigate the mass modifications of scalar mesons (; ), vector mesons (; ), and axialvector mesons (; ) at finite density and temperature of the nuclear medium. The above mesons are modified in the nuclear medium through the modification of quark and gluon condensates. We will find the medium modification of quark and gluon condensates within chiral SU(3) model through the medium modification of scalarisoscalar fields and at finite density and temperature. These medium modified quark and gluon condensates will further be used through QCD sum rules for the evaluation of inmedium properties of the above mentioned scalar, vector, and axial vector mesons. We will also discuss the effects of density and temperature of the nuclear medium on the scattering lengths of the above scalar, vector, and axialvector mesons. The study of the medium modifications of the above mesons may be helpful for understanding their production rates in heavyion collision experiments. The results of present investigations of medium modifications of scalar, vector, and axialvector mesons at finite density and temperature can be verified in the compressed baryonic matter (CBM) experiment of FAIR facility at GSI, Germany.
Arvind Kumar
Copyright © 2014 Arvind Kumar. All rights reserved.

Emission of Protons and Charged Pions in p + Cu and p + Pb Collisions at 3, 8, and 15 GeV/c
Sun, 20 Jul 2014 06:28:10 +0000
http://www.hindawi.com/journals/ahep/2014/675192/
We present an analysis of proton and charged pion transverse momentum spectra of and reactions at 3, 8, and 15 GeV/c in the framework of a multisource thermal model. The spectra are compared closely with the experimental data of HARPCDP at all angular intervals. The result shows that the widths of the particle distributions in both and collisions decrease with increasing the angle for the same incident momentum.
J. H. Kang, Y. C. Qian, B. C. Li, and S. W. Wu
Copyright © 2014 J. H. Kang et al. All rights reserved.

Common Behaviors of SpinorType Instantons in 2D Thirring and 4D Gursey Fermionic Models
Thu, 17 Jul 2014 10:07:40 +0000
http://www.hindawi.com/journals/ahep/2014/148375/
We investigate two examples of conformal invariant pure spinor fermionic models, which admit particlelike solutions of the classical field equations. For different dimensions and quantum spinor numbers, the vector field visualizations of the models are constructed to provide a better understanding of the spinortype instanton dynamics in phase space. The hierarchical cluster analysis method investigations of the models are also presented. Finally, the autocorrelation and power spectrum graphs of models are constructed and frequencies of motions are defined.
Fatma Aydogmus and Eren Tosyali
Copyright © 2014 Fatma Aydogmus and Eren Tosyali. All rights reserved.

On Finite Interquark Potential in Driven by a Minimal Length
Thu, 17 Jul 2014 00:00:00 +0000
http://www.hindawi.com/journals/ahep/2014/142373/
We address the effect of a quantum gravity induced minimal length on a physical observable for threedimensional YangMills. Our calculation is done within stationary perturbation theory. Interestingly enough, we find an ultraviolet finite interaction energy, which contains a regularized logarithmic function and a linear confining potential. This result highlights the role played by the new quantum of length in our discussion.
Patricio Gaete
Copyright © 2014 Patricio Gaete. All rights reserved.

Gaseous Detector with SubkeV Threshold to Study Neutrino Scattering at Low Recoil Energies
Tue, 15 Jul 2014 12:27:49 +0000
http://www.hindawi.com/journals/ahep/2014/147046/
Gaseous detector with a subkeV electron equivalent threshold is a very perspective tool for the precision measurement of the neutrino magnetic moment and for observing coherent scattering of neutrinos on nuclei. The progress in the development of low noise electronics makes it possible to register the rare events at the threshold less than 100 eV. The construction of the gaseous detector is given and the typical pulses with amplitudes of a few eV observed on a bench scale installation are presented. The possible implications for future experiments are discussed.
A. V. Kopylov, I. V. Orekhov, V. V. Petukhov, and A. E. Solomatin
Copyright © 2014 A. V. Kopylov et al. All rights reserved.

Scattering and Bound States of DuffinKemmerPetiau Particles for Parameter Hyperbolic PöschlTeller Potential
Mon, 14 Jul 2014 12:11:09 +0000
http://www.hindawi.com/journals/ahep/2014/840907/
The DuffinKemmerPetiau (DKP) equation in the presence of a scalar potential is solved in one spatial dimension for the vector parameter Hyperbolic PöschlTeller (HPT) potential. In obtaining complete solutions we used the weak interaction approach and took the scalar and vector potentials in a correlated form. By looking at the asymptotic behaviors of the solutions, we identify the bound and scattering states. We calculate transmission () and reflection () probability densities and analyze their dependence on the potential shape parameters. Also we investigate the dependence of energy eigenvalues of the bound states on the potential shape parameters.
Hilmi Yanar, Ali Havare, and Kenan Sogut
Copyright © 2014 Hilmi Yanar et al. All rights reserved.

Theory of NeutrinoAtom Collisions: The History, Present Status, and BSM Physics
Thu, 10 Jul 2014 08:42:21 +0000
http://www.hindawi.com/journals/ahep/2014/569409/
An overview of the current theoretical studies on neutrinoatom scattering processes is presented. The ionization channel of these processes, which is studied in experiments searching for neutrino magnetic moments, is brought into focus. Recent developments in the theory of atomic ionization by impact of reactor antineutrinos are discussed. It is shown that the stepping approximation is well applicable for the data analysis practically down to the ionization threshold.
Konstantin A. Kouzakov and Alexander I. Studenikin
Copyright © 2014 Konstantin A. Kouzakov and Alexander I. Studenikin. All rights reserved.

Dirac Particle for the Position Dependent Mass in the Generalized Asymmetric WoodsSaxon Potential
Thu, 10 Jul 2014 00:00:00 +0000
http://www.hindawi.com/journals/ahep/2014/973847/
The onedimensional Dirac equation with position dependent mass in the generalized asymmetric WoodsSaxon potential is solved in terms of the hypergeometric functions. The transmission and reflection coefficients are obtained by considering the onedimensional electric current density for the Dirac particle and the equation describing the bound states is found by utilizing the continuity conditions of the obtained wave function. Also, by using the generalized asymmetric WoodsSaxon potential solutions, the scattering states are found out without making calculation for the WoodsSaxon, Hulthen, cusp potentials, and so forth, which are derived from the generalized asymmetric WoodsSaxon potential and the conditions describing transmission resonances and supercriticality are achieved. At the same time, the data obtained in this work are compared with the results achieved in earlier studies and are observed to be consistent.
Soner Alpdoğan and Ali Havare
Copyright © 2014 Soner Alpdoğan and Ali Havare. All rights reserved.

Chemical Potentials of Quarks Extracted from Particle Transverse Momentum Distributions in Heavy Ion Collisions at RHIC Energies
Tue, 08 Jul 2014 09:18:48 +0000
http://www.hindawi.com/journals/ahep/2014/742193/
In the framework of a multisource thermal model, the transverse momentum distributions of charged particles produced in nucleusnucleus (AA) and deuteronnucleus (dA) collisions at relativistic heavy ion collider (RHIC) energies are investigated by a twocomponent revised Boltzmann distribution. The calculated results are in agreement with the PHENIX experimental data. It is found that the source temperature increases obviously with increase of the particle mass and incident energy, but it does not show an obvious change with the collision centrality. Then, the values of chemical potentials for up, down, and strange quarks can be obtained from the antiparticle to particle yield ratios in a wide transverse momentum range. The relationship between the chemical potentials of quarks and the transverse momentum with different centralities is investigated, too.
Hong Zhao and FuHu Liu
Copyright © 2014 Hong Zhao and FuHu Liu. All rights reserved.

Transverse Momentum and Pseudorapidity Distributions of Charged Particles and Spatial Shapes of Interacting Events in PbPb Collisions at 2.76 TeV
Mon, 07 Jul 2014 07:51:29 +0000
http://www.hindawi.com/journals/ahep/2014/725739/
The transverse momentum and pseudorapidity distributions of charged
particles produced in PbPb collisions with different centrality intervals at centerofmass
energy per nucleon pair TeV have been analyzed by using the improved
multisource thermal model in which the whole interacting system and then the sources
are described by the Tsallis statistics. The modelling results are in agreement with experimental data of the ALICE Collaboration. The rapidity distributions of charged particles are obtained according to the extracted parameter values. The shapes of interacting
events (the dispersion plots of charged particles) are given in the momentum, rapidity,
velocity, and coordinate spaces. Meanwhile, the event shapes in different spaces consisted
by different transverse quantities and longitudinal quantities are presented.
FuHu Liu, YaQin Gao, Tian Tian, and BaoChun Li
Copyright © 2014 FuHu Liu et al. All rights reserved.

Eta Prime Gluonic Contribution to the Nucleon SelfEnergy in an Effective Theory
Mon, 07 Jul 2014 00:00:00 +0000
http://www.hindawi.com/journals/ahep/2014/841703/
We estimate a possible gluonic contribution to the selfenergy of a nucleon in an effective theory. The couplings of the topological charge density to nucleons give rise to OZI violating nucleon interactions. The oneloop selfenergy of nucleon arising due to these interactions is studied using a heavy baryon chiral perturbation theory. The divergences have been removed using appropriate form factors. The nontrivial structure of the QCD vacuum has also been taken into account. The numerical results are sensitive to the choice of the regulator to a nonnegligible extent. We get the total contribution to the nucleon mass coming from its interaction with the topological charge density % of the nucleon mass.
A. Upadhyay and J. P. Singh
Copyright © 2014 A. Upadhyay and J. P. Singh. All rights reserved.

Analytical BPS MaxwellHiggs Vortices
Wed, 02 Jul 2014 09:31:45 +0000
http://www.hindawi.com/journals/ahep/2014/210929/
We have established a prescription for the calculation of analytical vortex solutions in the context of generalized MaxwellHiggs models whose overall dynamics is controlled by two positive functions of the scalar field, namely, and . We have also determined a natural constraint between these functions and the Higgs potential , allowing the existence of axially symmetric Bogomol'nyiPrasadSommerfield (BPS) solutions possessing finite energy. Furthermore, when the generalizing functions are chosen suitably, the nonstandard BPS equations can be solved exactly. We have studied some examples, comparing them with the usual AbrikosovNielsenOlesen (ANO) solution. The overall conclusion is that the analytical selfdual vortices are wellbehaved in all relevant sectors, strongly supporting the consistency of the respective generalized models. In particular, our results mimic wellknown properties of the usual (numerical) configurations, as localized energy density, while contributing to the understanding of topological solitons and their description by means of analytical methods.
R. Casana, M. M. Ferreira Jr., E. da Hora, and C. dos Santos
Copyright © 2014 R. Casana et al. All rights reserved.

Anomalous Couplings in Collision at the LHC
Wed, 02 Jul 2014 08:35:50 +0000
http://www.hindawi.com/journals/ahep/2014/935840/
We have examined the constraints on the anomalous couplings through the process at the LHC by considering four forward detector acceptances: , , , and , where with and the energies of the photon and of the incoming proton, respectively. The sensitivity bounds on the anomalous couplings have been obtained at the 95% confidence level in a model independent effective Lagrangian approach. We have found that the bounds on these couplings can be highly improved compared to current experimental bounds.
M. Köksal and S. C. İnan
Copyright © 2014 M. Köksal and S. C. İnan. All rights reserved.

Exact Solutions of the Dirac Hamiltonian on the Sphere under Hyperbolic Magnetic Fields
Tue, 01 Jul 2014 11:44:53 +0000
http://www.hindawi.com/journals/ahep/2014/186425/
Twodimensional massless Dirac Hamiltonian under the influence of hyperbolic magnetic fields is mentioned in curved space. Using a spherical surface parameterization, the Dirac operator on the sphere is presented and the system is given as two supersymmetric partner Hamiltonians which coincides with the position dependent mass Hamiltonians. We introduce two ansatzes for the component of the vector potential to acquire effective solvable models, which are RosenMorse II potential and the model given Midya and Roy, whose bound states are Jacobi type polynomials, and we adapt our work to these special models under some parameter restrictions. The energy spectrum and the eigenvectors are found for RosenMorse II potential. On the other hand, complete solutions are given for the second system. The vector and the effective potentials with their eigenvalues are sketched for each system.
Özlem Yeşiltaş
Copyright © 2014 Özlem Yeşiltaş. All rights reserved.

Astronomical Signatures of Dark Matter
Thu, 26 Jun 2014 00:00:00 +0000
http://www.hindawi.com/journals/ahep/2014/878203/
Several independent astronomical observations in different wavelength bands reveal the existence of much larger quantities of matter than what we would deduce from assuming a solar mass to light ratio. They are very high velocities of individual galaxies within clusters of galaxies, higher than expected rotation rates of stars in the outer regions of galaxies, 21 cm line studies indicative of increasing mass to light ratios with radius in the halos of spiral galaxies, hot gaseous Xray emitting halos around many elliptical galaxies, and clusters of galaxies requiring a much larger component of unseen mass for the hot gas to be bound. The level of gravitational attraction needed for the spatial distribution of galaxies to evolve from the small perturbations implied by the very slightly anisotropic cosmic microwave background radiation to its current weblike configuration requires much more mass than is observed across the entire electromagnetic spectrum. Distorted shapes of galaxies and other features created by gravitational lensing in the images of many astronomical objects require an amount of dark matter consistent with other estimates. The unambiguous detection of dark matter and more recently evidence for dark energy has positioned astronomy at the frontier of fundamental physics as it was in the 17th century.
Paul Gorenstein and Wallace Tucker
Copyright © 2014 Paul Gorenstein and Wallace Tucker. All rights reserved.

The Annual Modulation Signature for Dark Matter: DAMA/LIBRAPhase1 Results and Perspectives
Tue, 24 Jun 2014 00:00:00 +0000
http://www.hindawi.com/journals/ahep/2014/605659/
The results obtained with the total exposure of 1.04 ton × yr collected by DAMA/LIBRAphase1 deep underground at the Gran Sasso National Laboratory (LNGS) of the I.N.F.N. during 7 annual cycles are summarized. The DAMA/LIBRAphase1 and the former DAMA/NaI data (cumulative exposure 1.33 ton × yr, corresponding to 14 annual cycles) give evidence at 9.3 σ C.L. for the presence of Dark Matter (DM) particles in the galactic halo, on the basis of the exploited model independent DM annual modulation signature by using highly radiopure NaI(Tl) target. The modulation amplitude of the singlehit events in the (2–6) keV energy interval is cpd/kg/keV; the measured phase is days and the measured period is yr; values are in a good well in agreement with those expected for DM particles. No systematic or side reactions able to mimic the exploited DM signature have been found or suggested by anyone over more than a decade. Some of the perspectives of the presently running DAMA/LIBRAphase2 are outlined.
Rita Bernabei, Pierluigi Belli, Fabio Cappella, Vincenzo Caracciolo, Simone Castellano, Riccardo Cerulli, Chang Jang Dai, Annelisa d’Angelo, Silio d’Angelo, Alessandro Di Marco, H. L. He, Antonella Incicchitti, H. H. Kuang, X. H. Ma, Francesco Montecchia, X. D. Sheng, Rui Guang Wang, and ZiPiao Ye
Copyright © 2014 Rita Bernabei et al. All rights reserved.

Experimental Tests of Quantum Gravity and Exotic Quantum Field Theory Effects
Mon, 23 Jun 2014 12:16:27 +0000
http://www.hindawi.com/journals/ahep/2014/192712/
Emil T. Akhmedov, Stephen Minter, Piero Nicolini, and Douglas Singleton
Copyright © 2014 Emil T. Akhmedov et al. All rights reserved.