Advances in High Energy Physics The latest articles from Hindawi Publishing Corporation © 2016 , Hindawi Publishing Corporation . All rights reserved. Impact Parameter Dependence of Ratio in Probing the Nuclear Symmetry Energy Using Heavy-Ion Collisions Wed, 03 Feb 2016 14:18:42 +0000 The impact parameter dependence of ratio is examined in heavy-ion collisions at 400 MeV/nucleon within a transport model. It is shown that the sensitivity of ratio on symmetry energy shows a transition from central to peripheral collisions; that is, the stiffer symmetry energy leads to a larger ratio in peripheral collisions while the softer symmetry energy always leads this ratio to be larger in central collisions. After checking the kinematic energy distribution of ratio, we found this transition of sensitivity of ratio to symmetry energy is mainly from less energetic pions; that is, the softer symmetry energy gets the less energetic pions to form a smaller ratio in peripheral collisions while these pions generate a larger ratio in central collisions. Undoubtedly, the softer symmetry energy can also lead more energetic pions to form a larger ratio in peripheral collisions. Nevertheless, considering that most of pions are insufficiently energetic at this beam energy, we therefore suggest the ratio as a probe of the high-density symmetry energy effective only in central at most to midcentral collisions, thereby avoiding the possible information of low-density symmetry energy carried in ratio from peripheral collisions. Gao-Feng Wei, Guo-Qiang He, Xin-Wei Cao, and Yi-Xin Lu Copyright © 2016 Gao-Feng Wei et al. All rights reserved. Some Remarks on Nonlinear Electrodynamics Tue, 02 Feb 2016 10:59:00 +0000 By using the gauge-invariant, but path-dependent, variables formalism, we study both massive Euler-Heisenberg-like and Euler-Heisenberg-like electrodynamics in the approximation of the strong-field limit. It is shown that massive Euler-Heisenberg-type electrodynamics displays the vacuum birefringence phenomenon. Subsequently, we calculate the lowest-order modifications to the interaction energy for both classes of electrodynamics. As a result, for the case of massive Euler-Heisenbeg-like electrodynamics (Wichmann-Kroll), unexpected features are found. We obtain a new long-range (-type) correction, apart from a long-range -type) correction to the Coulomb potential. Furthermore, Euler-Heisenberg-like electrodynamics in the approximation of the strong-field limit (to the leading logarithmic order) displays a long-range (-type) correction to the Coulomb potential. Besides, for their noncommutative versions, the interaction energy is ultraviolet finite. Patricio Gaete Copyright © 2016 Patricio Gaete. All rights reserved. The Results of MINOS and the Future with MINOS+ Sun, 31 Jan 2016 10:11:27 +0000 The MINOS experiment took data from 2005 up until 2012. The MINOS experiment took data from 2005 up until 2012, continuing beyond that as the MINOS+ experiment. The experiment is a two-detector, on-axis, long-baseline experiment, sending neutrinos from Fermilab to the Soudan Underground Laboratory in northern Minnesota. By searching for the deficit of muon neutrinos at the Far Detector, MINOS/MINOS+ is sensitive to the atmospheric neutrino oscillation parameters and . By using the full MINOS data set looking at both disappearance and appearance in both neutrino and antineutrino configurations at the NuMI beam along with atmospheric neutrino data recorded at the FD, MINOS has made the most precise measurement of . Using a full three-flavour framework and searching for appearance, MINOS/MINOS+ gains sensitivity to , the mass hierarchy, and the octant of . Exotic phenomenon is also explored with the MINOS detectors looking for nonstandard interactions and sterile neutrinos. The current MINOS+ era goals are to build on the previous MINOS results improving the precision on the three-flavour oscillation parameter measurements and strengthening the constraints placed on the sterile neutrino parameter space. A. Timmons Copyright © 2016 A. Timmons. All rights reserved. A -Continuum of Off-Shell Supermultiplets Sun, 31 Jan 2016 07:17:40 +0000 Within each supermultiplet in the standard literature, supersymmetry relates its bosonic and fermionic component fields in a fixed way, particularly to the selected supermultiplet. Herein, we describe supermultiplets wherein a continuously variable “tuning parameter” modifies the supersymmetry transformations, effectively parametrizing a novel “-continuum” of distinct finite-dimensional off-shell supermultiplets, which may be probed already with bilinear Lagrangians that couple to each other and to external magnetic fields, two or more of these continuously many supermultiplets, each “tuned” differently. The dependence on the tuning parameters cannot be removed by any field redefinition, rendering this “-moduli space” observable. Tristan Hübsch and Gregory A. Katona Copyright © 2016 Tristan Hübsch and Gregory A. Katona. All rights reserved. Current Status and Future Prospects of the SNO+ Experiment Sun, 24 Jan 2016 10:57:05 +0000 SNO+ is a large liquid scintillator-based experiment located 2 km underground at SNOLAB, Sudbury, Canada. It reuses the Sudbury Neutrino Observatory detector, consisting of a 12 m diameter acrylic vessel which will be filled with about 780 tonnes of ultra-pure liquid scintillator. Designed as a multipurpose neutrino experiment, the primary goal of SNO+ is a search for the neutrinoless double-beta decay (0) of 130Te. In Phase I, the detector will be loaded with 0.3% natural tellurium, corresponding to nearly 800 kg of 130Te, with an expected effective Majorana neutrino mass sensitivity in the region of 55–133 meV, just above the inverted mass hierarchy. Recently, the possibility of deploying up to ten times more natural tellurium has been investigated, which would enable SNO+ to achieve sensitivity deep into the parameter space for the inverted neutrino mass hierarchy in the future. Additionally, SNO+ aims to measure reactor antineutrino oscillations, low energy solar neutrinos, and geoneutrinos, to be sensitive to supernova neutrinos, and to search for exotic physics. A first phase with the detector filled with water will begin soon, with the scintillator phase expected to start after a few months of water data taking. The Phase I is foreseen for 2017. S. Andringa, E. Arushanova, S. Asahi, M. Askins, D. J. Auty, A. R. Back, Z. Barnard, N. Barros, E. W. Beier, A. Bialek, S. D. Biller, E. Blucher, R. Bonventre, D. Braid, E. Caden, E. Callaghan, J. Caravaca, J. Carvalho, L. Cavalli, D. Chauhan, M. Chen, O. Chkvorets, K. Clark, B. Cleveland, I. T. Coulter, D. Cressy, X. Dai, C. Darrach, B. Davis-Purcell, R. Deen, M. M. Depatie, F. Descamps, F. Di Lodovico, N. Duhaime, F. Duncan, J. Dunger, E. Falk, N. Fatemighomi, R. Ford, P. Gorel, C. Grant, S. Grullon, E. Guillian, A. L. Hallin, D. Hallman, S. Hans, J. Hartnell, P. Harvey, M. Hedayatipour, W. J. Heintzelman, R. L. Helmer, B. Hreljac, J. Hu, T. Iida, C. M. Jackson, N. A. Jelley, C. Jillings, C. Jones, P. G. Jones, K. Kamdin, T. Kaptanoglu, J. Kaspar, P. Keener, P. Khaghani, L. Kippenbrock, J. R. Klein, R. Knapik, J. N. Kofron, L. L. Kormos, S. Korte, C. Kraus, C. B. Krauss, K. Labe, I. Lam, C. Lan, B. J. Land, S. Langrock, A. LaTorre, I. Lawson, G. M. Lefeuvre, E. J. Leming, J. Lidgard, X. Liu, Y. Liu, V. Lozza, S. Maguire, A. Maio, K. Majumdar, S. Manecki, J. Maneira, E. Marzec, A. Mastbaum, N. McCauley, A. B. McDonald, J. E. McMillan, P. Mekarski, C. Miller, Y. Mohan, E. Mony, M. J. Mottram, V. Novikov, H. M. O’Keeffe, E. O’Sullivan, G. D. Orebi Gann, M. J. Parnell, S. J. M. Peeters, T. Pershing, Z. Petriw, G. Prior, J. C. Prouty, S. Quirk, A. Reichold, A. Robertson, J. Rose, R. Rosero, P. M. Rost, J. Rumleskie, M. A. Schumaker, M. H. Schwendener, D. Scislowski, J. Secrest, M. Seddighin, L. Segui, S. Seibert, T. Shantz, T. M. Shokair, L. Sibley, J. R. Sinclair, K. Singh, P. Skensved, A. Sörensen, T. Sonley, R. Stainforth, M. Strait, M. I. Stringer, R. Svoboda, J. Tatar, L. Tian, N. Tolich, J. Tseng, H. W. C. Tseung, R. Van Berg, E. Vázquez-Jáuregui, C. Virtue, B. von Krosigk, J. M. G. Walker, M. Walker, O. Wasalski, J. Waterfield, R. F. White, J. R. Wilson, T. J. Winchester, A. Wright, M. Yeh, T. Zhao, and K. Zuber Copyright © 2016 S. Andringa et al. All rights reserved. The Effect of Tensor Interaction in Splitting the Energy Levels of Relativistic Systems Thu, 21 Jan 2016 07:03:33 +0000 We solve approximately Dirac equation for Eckart plus Hulthen potentials with Coulomb-like and Yukawa-like tensor interaction in the presence of spin and pseudospin symmetry for . The formula method is used to obtain the energy eigenvalues and wave functions. We also discuss the energy eigenvalues and the Dirac spinors for Eckart plus Hulthen potentials with formula method. To show the accuracy of the present model, some numerical results are shown in both pseudospin and spin symmetry limits. Mohammad Reza Shojaei and Mohsen Mousavi Copyright © 2016 Mohammad Reza Shojaei and Mohsen Mousavi. All rights reserved. Neutrino Spin and Dispersion in Magnetized Medium Tue, 19 Jan 2016 11:01:48 +0000 The full energy shift of a massive Dirac neutrino in magnetized electron-positron plasma was investigated using the Matsubara imaginary time and real time formalisms. The neutrino dispersion in the magnetized medium was analyzed as a function of the neutrino spin and mass. It was shown that in a superstrong magnetic field the CP-symmetric plasma contribution to the neutrino energy greatly exceeds the analogous correction in the field-free case. The contribution of plasma to the anomalous magnetic moment of a neutrino was obtained. P. A. Eminov Copyright © 2016 P. A. Eminov. All rights reserved. Stability of a Noncanonical Scalar Field Model during Cosmological Date Wed, 13 Jan 2016 09:37:24 +0000 Using the noncanonical model of scalar field, the cosmological consequences of a pervasive, self-interacting, homogeneous, and rolling scalar field are studied. In this model, the scalar field potential is “nonlinear” and decreases in magnitude with increasing the value of the scalar field. A special solution of the nonlinear field equations of that has time dependency as fixed point is obtained. The fixed point relies on the noncanonical term of action and -parameter; this parameter appeared in energy density of scalar field redshift. By means of such fixed point the different eigenvalues of the equation of motion will be obtained. In different epochs in the evolution of the Universe for different values of and , the potentials as a function of scalar field are attained. The behavior of baryonic perturbations in linear perturbation scenario as a considerable amount of energy density of scalar field at low redshifts prevents the growth of perturbations in the ordinary matter fluid. The energy density in the scalar field is not appreciably perturbed by nonrelativistic gravitational fields, in either the radiation or matter dominant or scalar field dominated epoch. Z. Ossoulian, T. Golanbari, H. Sheikhahmadi, and Kh. Saaidi Copyright © 2016 Z. Ossoulian et al. All rights reserved. MSSM Dark Matter in Light of Higgs and LUX Results Sun, 10 Jan 2016 12:32:21 +0000 The constraints imposed on the Minimal Supersymmetric Standard Model (MSSM) parameter space by the Large Hadron Collider (LHC) Higgs mass limit and gluino mass lower bound are revisited. We also analyze the thermal relic abundance of lightest neutralino, which is the Lightest Supersymmetric Particle (LSP). We show that the combined LHC and relic abundance constraints rule out most of the MSSM parameter space except a very narrow region with very large   (~50). Within this region, we emphasize that the spin-independent scattering cross section of the LSP with a proton is less than the latest Large Underground Xenon (LUX) limit by at least two orders of magnitude. Finally, we argue that nonthermal Dark Matter (DM) scenario may relax the constraints imposed on the MSSM parameter space. Namely, the following regions are obtained:  TeV and  GeV for low   (~10);  TeV or  TeV and  GeV for large   (~50). W. Abdallah and S. Khalil Copyright © 2016 W. Abdallah and S. Khalil. All rights reserved. Dark Spinors Hawking Radiation in String Theory Black Holes Sun, 10 Jan 2016 11:46:33 +0000 The Hawking radiation spectrum of Kerr-Sen axion-dilaton black holes is derived, in the context of dark spinors tunnelling across the horizon. Since a black hole has a well defined temperature, it should radiate in principle all the standard model particles, similar to a black body at that temperature. We investigate the tunnelling of mass dimension one spin-1/2 dark fermions, which are beyond the standard model and are prime candidates to the dark matter. Their interactions with the standard model matter and gauge fields are suppressed by at least one power of unification scale, being restricted just to the Higgs field and to the graviton likewise. The tunnelling method for the emission and absorption of mass dimension one particles across the event horizon of Kerr-Sen axion-dilaton black holes is shown here to provide further evidence for the universality of black hole radiation, further encompassing particles beyond the standard model. R. T. Cavalcanti and Roldão da Rocha Copyright © 2016 R. T. Cavalcanti and Roldão da Rocha. All rights reserved. Comparing Erlang Distribution and Schwinger Mechanism on Transverse Momentum Spectra in High Energy Collisions Mon, 04 Jan 2016 11:23:57 +0000 We study the transverse momentum spectra of and mesons by using two methods: the two-component Erlang distribution and the two-component Schwinger mechanism. The results obtained by the two methods are compared and found to be in agreement with the experimental data of proton-proton (), proton-lead (-Pb), and lead-lead (Pb-Pb) collisions measured by the LHCb and ALICE Collaborations at the large hadron collider (LHC). The related parameters such as the mean transverse momentum contributed by each parton in the first (second) component in the two-component Erlang distribution and the string tension between two partons in the first (second) component in the two-component Schwinger mechanism are extracted. Li-Na Gao and Fu-Hu Liu Copyright © 2016 Li-Na Gao and Fu-Hu Liu. All rights reserved. The Antineutrino Energy Structure in Reactor Experiments Thu, 31 Dec 2015 06:54:24 +0000 The recent observation of an energy structure in the reactor antineutrino spectrum is reviewed. The reactor experiments Daya Bay, Double Chooz, and RENO have reported a consistent excess of antineutrinos deviating from the flux predictions, with a local significance of about 4 between 4 and 6 MeV of the positron energy spectrum. The possible causes of the structure are analyzed in this work, along with the different experimental approaches developed to identify its origin. Considering the available data and results from the three experiments, the most likely explanation concerns the reactor flux predictions and the associated uncertainties. Therefore, the different current models are described and compared. The possible sources of incompleteness or inaccuracy of such models are discussed, as well as the experimental data required to improve their precision. Pau Novella Copyright © 2015 Pau Novella. All rights reserved. On the Velocity of Moving Relativistic Unstable Quantum Systems Thu, 31 Dec 2015 06:19:55 +0000 We study properties of moving relativistic quantum unstable systems. We show that in contrast to the properties of classical particles and quantum stable objects the velocity of freely moving relativistic quantum unstable systems cannot be constant in time. We show that this new quantum effect results from the fundamental principles of the quantum theory and physics: it is a consequence of the principle of conservation of energy and of the fact that the mass of the quantum unstable system is not defined. This effect can affect the form of the decay law of moving relativistic quantum unstable systems. K. Urbanowski Copyright © 2015 K. Urbanowski. All rights reserved. Dynamics of Mixed Dark Energy Domination in Teleparallel Gravity and Phase-Space Analysis Wed, 30 Dec 2015 09:03:59 +0000 We consider a novel dark energy model to investigate whether it will provide an expanding universe phase. Here we propose a mixed dark energy domination which is constituted by tachyon, quintessence, and phantom scalar fields nonminimally coupled to gravity, in the absence of background dark matter and baryonic matter, in the framework of teleparallel gravity. We perform the phase-space analysis of the model by numerical methods and find the late-time accelerated attractor solutions implying the acceleration phase of universe. Emre Dil and Erdinç Kolay Copyright © 2015 Emre Dil and Erdinç Kolay. All rights reserved. Exact Analytical Solution of the -Dimensional Radial Schrödinger Equation with Pseudoharmonic Potential via Laplace Transform Approach Wed, 30 Dec 2015 08:50:07 +0000 The second-order -dimensional Schrödinger equation with pseudoharmonic potential is reduced to a first-order differential equation by using the Laplace transform approach and exact bound state solutions are obtained using convolution theorem. Some special cases are verified and variations of energy eigenvalues as a function of dimension are furnished. To give an extra depth of this paper, the present approach is also briefly investigated for generalized Morse potential as an example. Tapas Das and Altuğ Arda Copyright © 2015 Tapas Das and Altuğ Arda. All rights reserved. Criticality of Conformal Anomaly Corrected AdS Black Holes Mon, 28 Dec 2015 06:19:25 +0000 The effects of conformal anomaly on the thermodynamics of black holes are investigated in this paper from the perspective of criticality of AdS black holes. Treating the cosmological constant as thermodynamic pressure, we extend the recent research to the extended phase space. Firstly, we study the - criticality of the uncharged AdS black holes with conformal anomaly and find that conformal anomaly does not influence whether there exists Van der Waals like critical behavior. Secondly, we investigate the - criticality of the charged cases and find that conformal anomaly influences not only the critical physical quantities but also the ratio . The ratio is no longer a constant as before but a function of conformal anomaly parameter . We also show that the conformal parameter should satisfy a certain range to guarantee the existence of critical point that has physical meaning. Our results show the effects of conformal anomaly. Jie-Xiong Mo and Wen-Biao Liu Copyright © 2015 Jie-Xiong Mo and Wen-Biao Liu. All rights reserved. Aharonov-Bohm Effect for Bound States on the Confinement of a Relativistic Scalar Particle to a Coulomb-Type Potential in Kaluza-Klein Theory Thu, 24 Dec 2015 09:50:24 +0000 Based on the Kaluza-Klein theory, we study the Aharonov-Bohm effect for bound states for a relativistic scalar particle subject to a Coulomb-type potential. We introduce this scalar potential as a modification of the mass term of the Klein-Gordon equation, and a magnetic flux through the line element of the Minkowski spacetime in five dimensions. Then, we obtain the relativistic bound states solutions and calculate the persistent currents. E. V. B. Leite, H. Belich, and K. Bakke Copyright © 2015 E. V. B. Leite et al. All rights reserved. Particle Dynamics around Weakly Magnetized Reissner-Nordström Black Hole Wed, 16 Dec 2015 14:05:35 +0000 Considering the geometry of Reissner-Nordström (RN) black hole immersed in magnetic field, we have studied the dynamics of neutral and charged particles. A collision of particles in the inner stable circular orbit is considered and the conditions for the escape of colliding particles from the vicinity of black hole are given. The trajectories of the escaping particle are discussed. Also, the velocity required for this escape is calculated. It is observed that there is more than one stable region if magnetic field is present in the accretion disk of black hole, so the stability of ISCO increases in the presence of magnetic field. Effect of magnetic field on the angular motion of neutral and charged particles is observed graphically. Bushra Majeed, Mubasher Jamil, and Saqib Hussain Copyright © 2015 Bushra Majeed et al. All rights reserved. Measurement of Atmospheric Neutrino Oscillations with Very Large Volume Neutrino Telescopes Tue, 15 Dec 2015 06:37:44 +0000 Neutrino oscillations have been probed during the last few decades using multiple neutrino sources and experimental set-ups. In the recent years, very large volume neutrino telescopes have started contributing to the field. First ANTARES and then IceCube have relied on large and sparsely instrumented volumes to observe atmospheric neutrinos for combinations of baselines and energies inaccessible to other experiments. Using this advantage, the latest result from IceCube starts approaching the precision of other established technologies and is paving the way for future detectors, such as ORCA and PINGU. These new projects seek to provide better measurements of neutrino oscillation parameters and eventually determine the neutrino mass ordering. The results from running experiments and the potential from proposed projects are discussed in this review, emphasizing the experimental challenges involved in the measurements. J. P. Yáñez and A. Kouchner Copyright © 2015 J. P. Yáñez and A. Kouchner. All rights reserved. The Deep Underground Neutrino Experiment Wed, 09 Dec 2015 09:48:01 +0000 The Deep Underground Neutrino Experiment (DUNE) is a worldwide effort to construct a next-generation long-baseline neutrino experiment based at the Fermi National Accelerator Laboratory. It is a merger of previous efforts and other interested parties to build, operate, and exploit a staged 40 kt liquid argon detector at the Sanford Underground Research Facility 1300 km from Fermilab, and a high precision near detector, exposed to a 1.2 MW, tunable beam produced by the PIP-II upgrade by 2024, evolving to a power of 2.3 MW by 2030. The neutrino oscillation physics goals and the status of the collaboration and project are summarized in this paper. Maury Goodman Copyright © 2015 Maury Goodman. All rights reserved. Helical Phase Inflation and Monodromy in Supergravity Theory Wed, 09 Dec 2015 06:17:47 +0000 We study helical phase inflation which realizes “monodromy inflation” in supergravity theory. In the model, inflation is driven by the phase component of a complex field whose potential possesses helicoid structure. We construct phase monodromy based on explicitly breaking global symmetry in the superpotential. By integrating out heavy fields, the phase monodromy from single complex scalar field is realized and the model fulfills natural inflation. The phase-axion alignment is achieved from explicitly symmetry breaking and gives super-Planckian phase decay constant. The -term scalar potential provides strong field stabilization for all the scalars except inflaton, which is protected by the approximate global symmetry. Besides, we show that helical phase inflation can be naturally realized in no-scale supergravity with symmetry since the supergravity setup needed for phase monodromy is automatically provided in the no-scale Kähler potential. We also demonstrate that helical phase inflation can be reduced to another well-known supergravity inflation model with shift symmetry. Helical phase inflation is free from the UV-sensitivity problem although there is super-Planckian field excursion, and it suggests that inflation can be effectively studied based on supersymmetric field theory while a UV-completed framework is not prerequisite. Tianjun Li, Zhijin Li, and Dimitri V. Nanopoulos Copyright © 2015 Tianjun Li et al. All rights reserved. Antineutrino Flux from the Laguna Verde Nuclear Power Plant Tue, 08 Dec 2015 13:27:28 +0000 We present a calculation of the antineutrino flux produced by the reactors at the Laguna Verde Nuclear Power Plant in México, based on the antineutrino spectra produced in the decay chains of the fission fragments of the main isotopes in the reactor core, and their fission rates, which have been calculated using the DRAGON simulation code. We also present an estimate of the number of expected events in a detector made of plastic scintillator with a mass of 1 ton, at 100 m from the reactor cores. Marisol Chavez-Estrada and Alexis A. Aguilar-Arevalo Copyright © 2015 Marisol Chavez-Estrada and Alexis A. Aguilar-Arevalo. All rights reserved. Reciprocity and Self-Tuning Relations without Wrapping Tue, 01 Dec 2015 11:23:58 +0000 We consider scalar Wilson operators of = 4 SYM at high spin, , and generic twist in the multicolor limit. We show that the corresponding (non)linear integral equations (originating from the asymptotic Bethe Ansatz equations) respect certain “reciprocity” and functional “self-tuning” relations up to all terms (inclusive) at any fixed ’t Hooft coupling . Of course, this relation entails straightforwardly the well-known (homonymous) relations for the anomalous dimension at the same order in . On this basis we give some evidence that wrapping corrections should enter the nonlinear integral equation and anomalous dimension expansions at the next order , at fixed ’t Hooft coupling, in such a way to reestablish the aforementioned relation (which fails otherwise). Davide Fioravanti, Gabriele Infusino, and Marco Rossi Copyright © 2015 Davide Fioravanti et al. All rights reserved. On Distributions of Emission Sources and Speed-of-Sound in Proton-Proton (Proton-Antiproton) Collisions Mon, 30 Nov 2015 16:42:31 +0000 The revised (three-source) Landau hydrodynamic model is used in this paper to study the (pseudo)rapidity distributions of charged particles produced in proton-proton and proton-antiproton collisions at high energies. The central source is assumed to contribute with a Gaussian function which covers the rapidity distribution region as wide as possible. The target and projectile sources are assumed to emit isotropically particles in their respective rest frames. The model calculations obtained with a Monte Carlo method are fitted to the experimental data over an energy range from 0.2 to 13 TeV. The values of the squared speed-of-sound parameter in different collisions are then extracted from the width of the rapidity distributions. Li-Na Gao and Fu-Hu Liu Copyright © 2015 Li-Na Gao and Fu-Hu Liu. All rights reserved. Bianchi Type-I Universe with Cosmological Constant and Quadratic Equation of State in Modified Gravity Thu, 26 Nov 2015 14:00:53 +0000 This paper deals with the study of Bianchi type-I universe in the context of gravity. Einstein’s field equations in gravity have been solved in the presence of cosmological constant and quadratic equation of state (EoS) , where is a constant. Here, we have discussed two classes of gravity; that is, and . A set of models has been taken into consideration based on the plausible relation. Also, we have studied some physical and kinematical properties of the models. G. P. Singh and Binaya K. Bishi Copyright © 2015 G. P. Singh and Binaya K. Bishi. All rights reserved. Non-Hermitian Dirac Hamiltonian in Three-Dimensional Gravity and Pseudosupersymmetry Thu, 19 Nov 2015 16:00:09 +0000 The Dirac Hamiltonian in the -dimensional curved space-time has been studied with a metric for an expanding de Sitter space-time which is two spheres. The spectrum and the exact solutions of the time dependent non-Hermitian and angle dependent Hamiltonians are obtained in terms of the Jacobi and Romanovski polynomials. Hermitian equivalent of the Hamiltonian obtained from the Dirac equation is discussed in the frame of pseudo-Hermiticity. Furthermore, pseudosupersymmetric quantum mechanical techniques are expanded to a curved Dirac Hamiltonian and a partner curved Dirac Hamiltonian is generated. Using -pseudo-Hermiticity, the intertwining operator connecting the non-Hermitian Hamiltonians to the Hermitian counterparts is found. We have obtained a new metric tensor related to the new Hamiltonian. Özlem Yeşiltaş Copyright © 2015 Özlem Yeşiltaş. All rights reserved. Critical Combinations of Higher-Order Terms in Einstein-Maxwell Theory and Compactification Wed, 18 Nov 2015 09:04:26 +0000 We discuss the role of a particular combination of higher derivative terms in higher dimensional theories, particularly in the background of spontaneous compactification. Two classes of theories are proposed in this paper. The first model as a generalization of the critical gravity with the Maxwell field could have a de Sitter solution. We consider the Lanczos-Lovelock term and Horndeski term as well as the higher-order Maxwell term for the second model, which contains a possible longer expansion time for the inflationary phase. It is interesting that both models can be regarded as the generalization of the Randjbar-Daemi, Salam and Strathdee (RSS) model and give the well behavior for inflation stage under the specific assumptions. Nahomi Kan and Kiyoshi Shiraishi Copyright © 2015 Nahomi Kan and Kiyoshi Shiraishi. All rights reserved. Complex-Mass Definition and the Structure of Unstable Particle’s Propagator Wed, 18 Nov 2015 08:13:05 +0000 The propagators of unstable particles are considered in framework of the convolution representation. Spectral function is found for a special case when the propagator of scalar unstable particle has Breit-Wigner form. The expressions for the dressed propagators of unstable vector and spinor fields are derived in an analytical way for this case. We obtain the propagators in modified Breit-Wigner forms which correspond to the complex-mass definition. Vladimir Kuksa Copyright © 2015 Vladimir Kuksa. All rights reserved. Fate of Electromagnetic Field on the Cracking of PSR J1614-2230 in Quadratic Regime Tue, 17 Nov 2015 08:24:13 +0000 We study the cracking of compact object PSR J1614-2230 in quadratic regime with electromagnetic field. For this purpose, we develop a general formalism to determine the cracking of charged compact objects. We apply local density perturbations to hydrostatic equilibrium equation as well as physical variables involved in the model. We plot the force distribution function against radius of the star with different parametric values of model both with and without charge. It is found that PSR J1614-2230 remains stable (no cracking) corresponding to different values of parameters when charge is zero, while it exhibits cracking (unstable) when charge is introduced. We conclude that stability region increases as amount of charge increases. M. Azam, S. A. Mardan, and M. A. Rehman Copyright © 2015 M. Azam et al. All rights reserved. Maximally Localized States and Quantum Corrections of Black Hole Thermodynamics in the Framework of a New Generalized Uncertainty Principle Tue, 17 Nov 2015 07:54:30 +0000 As a generalized uncertainty principle (GUP) leads to the effects of the minimal length of the order of the Planck scale and UV/IR mixing, some significant physical concepts and quantities are modified or corrected correspondingly. On the one hand, we derive the maximally localized states—the physical states displaying the minimal length uncertainty associated with a new GUP proposed in our previous work. On the other hand, in the framework of this new GUP we calculate quantum corrections to the thermodynamic quantities of the Schwardzschild black hole, such as the Hawking temperature, the entropy, and the heat capacity, and give a remnant mass of the black hole at the end of the evaporation process. Moreover, we compare our results with that obtained in the frameworks of several other GUPs. In particular, we observe a significant difference between the situations with and without the consideration of the UV/IR mixing effect in the quantum corrections to the evaporation rate and the decay time. That is, the decay time can greatly be prolonged in the former case, which implies that the quantum correction from the UV/IR mixing effect may give rise to a radical rather than a tiny influence to the Hawking radiation. Yan-Gang Miao, Ying-Jie Zhao, and Shao-Jun Zhang Copyright © 2015 Yan-Gang Miao et al. All rights reserved.