International Journal of Theoretical Physics (INT J THEOR PHYS )

Publisher: Springer Verlag

Description

International Journal of Theoretical Physics publishes original research and reviews in theoretical physics and neighboring fields such as mathematics and the biological sciences. Dedicated to the unification of the latest physics research this journal seeks to both map the direction of future research arising from new analytical methods including the latest progress in the use of computers as well as to complement traditional physics research by providing fresh inquiry into quantum measurement theory relativistic field theory and other similarly fundamental areas.

  • Impact factor
    1.09
    Hide impact factor history
     
    Impact factor
  • 5-year impact
    0.82
  • Cited half-life
    8.50
  • Immediacy index
    0.26
  • Eigenfactor
    0.01
  • Article influence
    0.20
  • Website
    International Journal of Theoretical Physics website
  • Other titles
    International journal of theoretical physics (Online), International journal of theoretical physics
  • ISSN
    0020-7748
  • OCLC
    39501197
  • Material type
    Document, Periodical, Internet resource
  • Document type
    Internet Resource, Computer File, Journal / Magazine / Newspaper

Publisher details

Springer Verlag

  • Pre-print
    • Author can archive a pre-print version
  • Post-print
    • Author can archive a post-print version
  • Conditions
    • Author's pre-print on pre-print servers such as arXiv.org
    • Author's post-print on author's personal website immediately
    • Author's post-print on any open access repository after 12 months after publication
    • Publisher's version/PDF cannot be used
    • Published source must be acknowledged
    • Must link to publisher version
    • Set phrase to accompany link to published version (see policy)
    • Articles in some journals can be made Open Access on payment of additional charge
  • Classification
    ​ green

Publications in this journal

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    ABSTRACT: Some precisions are given about the definition of the Hamiltonian operator H and its transformation properties, for a linear wave equation in a general spacetime. In the presence of time-dependent unitary gauge transformations, H as an operator depends on the gauge choice. The other observables of QM and their rates also become gauge-dependent unless a proper account for the gauge choice is done in their definition. We show the explicit effect of these non-uniqueness issues in the case of the Dirac equation in a general spacetime with the Schwinger gauge. We show also in detail why, the meaning of the energy in QM being inherited from classical Hamiltonian mechanics, the energy operator and its mean values ought to be well defined in a general spacetime.
    International Journal of Theoretical Physics 12/2014;
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    ABSTRACT: In this paper, how the dynamics of continuous variable entanglement affects quantum dense coding is quantitatively investigated. The spectrum of environment is Ohmic-like spectrum. The analytical expression of the mutual information is based on the assumption of weak system-reservoir interaction without Markovian and rotating wave approximation. By plotting the mutual information in terms of environment parameters such as reservoir temperature and spectral density, it’s found that the mutual information of dense coding is monotonically decreasing function for Markovian interaction in Ohmic-like environments, while it oscillates for non-Markovian ones. Besides, it’s suggested to select proper transmittance of beam-splitter to improve the performance of dense coding.
    International Journal of Theoretical Physics 12/2014;
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    ABSTRACT: We investigate the thermal quantum correlations in the Heisenberg XX spin chain, and the teleportation of a two-qubit entangled state via the spin chain is analyzed. It is found that the effects of external magnetic field and three-site interaction on the thermal entanglement and quantum discord between the nearest or the next nearest neighbor qubits behave differently in various aspects. Special attention is paid to how to enhance the quantum correlations of the output state and the average fidelity of the teleportation. We find that quantum discord gives a better performance in the quantum correlations transmission, and the three-site interaction is necessary for a successful teleportation.
    International Journal of Theoretical Physics 12/2014;
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    ABSTRACT: In this paper, a complete classification of Friedmann-Robertson-Walker (FRW) spacetime by using approximate Noether approach is presented. Considered spacetime is discussed for three different types of universe i.e. flat, open and closed. Different forms of cosmic scale factor a with respect to the nature of the universe, which posses the nontrivial Noether gauge symmetries (NGS) are reported. The perturbed Lagrangian corresponding to FRW metric in the Noether equation is used to get Noether operators. For different types of universe minimal and maximal set of Noether operators are reported. A list of Noether operators is also computed which is not only independent from the choice of the cosmic scale factor but also from the type of universe. Further, corresponding energy type first integral of motions are also calculated.
    International Journal of Theoretical Physics 12/2014;
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    ABSTRACT: We show that a state φ on a Jordan algebra 𝓐 induces complete inner product space if and only if φ is a convex combination of pure states. Inner product spaces generated by Type I n factor states and states on spin factors are described. We initiate study of completely positive maps in this connection by showing that pure completely positive map on a C ∗-algebra gives always complete inner product space in the Stinespring construction.
    International Journal of Theoretical Physics 12/2014;
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    ABSTRACT: We propose a novel scheme for the generation of two-atom maximally entangled states in cavity quantum electrodynamics. The scheme does not require the transfer of quantum information between the atoms and cavity. The distinct advantage of the proposed scheme is that during the operation the cavity is only virtually excited and thus the efficient decoherence time of the cavity is greatly prolonged. Then it is quite simple but also very robust to the cavity decay and the influence of the thermal field.
    International Journal of Theoretical Physics 12/2014;
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    ABSTRACT: In this brief note, we draw attention to a successful cosmological model that explains inflation, which, it is claimed has recently been detected.
    International Journal of Theoretical Physics 12/2014;
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    ABSTRACT: We study thermodynamic of strange quark matter (SQM) using the analytic expressions of free and internal energies. We investigate two regimes of the high density and low density separately. As a vital program, in the case of a massless gluon and massless quarks at finite temperature, we also present a geometry of thermodynamics for the gluon and Bosons using a Legendre invariance metric ,it is so called as geometrothermodynamic (GTD) to better understanding of the phase transition. The GTD metric and its second order scalar invariant have been obtained and we clarify the phase transition by study the singularities of the scalar curvature of this Riemannian metric. This method is ensemble dependence and to complete the phase transition, meanwhile we also investigate enthalpy and entropy and internal energy representations. Our work exposes new pictures of the nature of phase transitions in SQM.
    International Journal of Theoretical Physics 12/2014;
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    ABSTRACT: We study the decoherence dynamics of quantum tunneling of a two-level atom coupled into a single-mode electromagnetic field. Atomic internal and external degrees are entangled with the cavity field due to recoil during emission of a photon. We show that the quantum tunneling period depends on the distance between the two wells, and the tunneling process itself may or may not decohere depending on the distance between the two wells of the external potential compared to the wavelength corresponding to the internal transition.
    International Journal of Theoretical Physics 12/2014;
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    ABSTRACT: The present study deals with spatial homogeneous but totally anisotropic locally rotationally symmetric (LRS) Bianchi-I dark energy model in general relativity. The Einstein’s field equations have been studied under the assumption of a power law time variation of the expansion factor. The Hubble’s parameter (H) and distance modulus (μ) in our descended model are found to be good concordance with recent data of astrophysical observations under appropriate condition. The physical and geometrical behavior of universe have been discussed in detail.
    International Journal of Theoretical Physics 12/2014;
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    ABSTRACT: By analyzing the basic properties of a class of three-particle W states, we show how to establish a non-symmetric channel to realize a quantum dense code scheme, each quantum pair can carry log2 18 bits of classical message by employing different kinds of unitary transformation in three-dimensional Hilbert space, which can improve the transmission efficiency of classical message. Based on this quantum dense code, we propose a novel quantum secure direct communication scheme. The security of the scheme is also discussed in detail, and the error rate for eavesdropper is 50 %.
    International Journal of Theoretical Physics 12/2014;
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    ABSTRACT: The calculation of First Passage Time (moreover, even its probability density in time) has so far been generally viewed as an ill-posed problem in the domain of quantum mechanics. The reasons can be summarily seen in the fact that the quantum probabilities in general do not satisfy the Kolmogorov sum rule: the probabilities for entering and non-entering of Feynman paths into a given region of space-time do not in general add up to unity, much owing to the interference of alternative paths. In the present work, it is pointed out that a special case exists (within quantum framework), in which, by design, there exists one and only one available path (i.e., door-way) to mediate the (first) passage –no alternative path to interfere with. Further, it is identified that a popular family of quantum systems – namely the 1d tight binding Hamiltonian systems – falls under this special category. For these model quantum systems, the first passage time distributions are obtained analytically by suitably applying a method originally devised for classical (stochastic) mechanics (by Schroedinger in 1915). This result is interesting especially given the fact that the tight binding models are extensively used in describing everyday phenomena in condense matter physics.
    International Journal of Theoretical Physics 12/2014;
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    ABSTRACT: We propose a novel and efficient scheme for quantum teleportation of an arbitrary two-qubit state via GHZ-like states. In this scheme, the sender Alice performs two three-qubit von-Neumann projective measurements on the qubits, the receiver Bob can reconstruct the original state by making appropriate unitary transformations. This quantum teleportation scheme is perfect, i.e. the success probability can reach 1.
    International Journal of Theoretical Physics 12/2014; 53(12).
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    ABSTRACT: Recently Muralidharan and Panigrahi (Phys. Rev. A 78, 062333 2008) had shown that using a five-qubit cluster state as quantum channel, it is possible to teleport an arbitrary single-qubit state and an arbitrary two-qubit state. In this paper, we investigate this channel for the teleportation of a special form of three-qubit state.
    International Journal of Theoretical Physics 12/2014; 53(12).
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    ABSTRACT: We propose a scheme to prepare a two-qubit remote entangled state based on four-qubit cluster state in cavity quantum electrodynamics which involves the interaction of the atoms with the cavity. Through using four-particle cluster state as a quantum channel, we shown that the probability and fidelity of the successful remote state preparation can approach unit. In addition, our protocol only need single qubit measurement instead of the conventional Bell-state measurement, then it is quite simple but also very robust to the cavity decay and the influence of the thermal field.
    International Journal of Theoretical Physics 12/2014; 53(12).
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    ABSTRACT: A scheme is proposed to dynamically prepare spin squeezed state of trapped ions, which are simultaneously excited by a laser beam. Simple analytical formula for the spin squeezing parameter has been derived. Its shown that the spin squeezed state can be dynamically generated by adjusting the detunning, the Lamb-Dicke parameter and the Rabi frequency.
    International Journal of Theoretical Physics 12/2014; 53(12).
  • International Journal of Theoretical Physics 12/2014;
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    ABSTRACT: We propose a scheme for preparing multi-photon entangled state which is useful for sub-shot-noise sensitivity with beam splitter, where the entangled degree is measured by the reciprocal of the mean quantum Fisher information per particle (RMQFIP). The multi-photon entangled state can be prepared by adjusting the transmissivity of the beam splitter and the better multi-photon entangled state can be prepared by increasing the total number of photons.
    International Journal of Theoretical Physics 12/2014; 53(12).
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    ABSTRACT: We have considered a five-dimensional action, which is composed of a gravitational sector and a sector of matter, where the gravitational sector is given by a Chern-Simons gravity action instead of the Einstein-Hilbert action and where the matter sector is given by the so-called perfect fluid with barotropic EoS and new holographic dark energy. We will study the dynamic formulation of Chern-Simons gravity, where the coupling constant is promoted to a scalar field with potential. We have studied the implications of replacing the Einstein-Hilbert action by the Chern-Simons action on the cosmological evolution for a 5D FRW metric. The deceleration parameter shows that our considered model cannot cross the phantom divide. Also the natures of the cosmography parameters are examined in Chern-Simons gravity.
    International Journal of Theoretical Physics 12/2014; 53(12).