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New twistorial integral formulas for massless free fields of arbitrary spin
Springer Science and Business Media LLC - - 1991
J. G. Cardoso
Energy and Momentum of Higher Dimensional Black Holes
Springer Science and Business Media LLC - Tập 51 - Trang 1545-1554 - 2011
Melis Ulu Dog̃ru, Neriman Varlıklı, Derya Baykal, Güliz Kıy, Dog̃ukan Taṣer, Halife Çag̃lar, Emine Gündüz
In this paper, we devote to investigate the energy-momentum problem of higher dimensional black holes in the general theory of relativity. The energy and momentum complex of Møller has been used for the calculations. Also, total energy and total momentum of some special cases for higher dimensional black holes such as Schwarzschild-like black holes, Reissner-Nordström-like charged black holes, AdS...... hiện toàn bộ
Hawking Radiation of Photons in a Vaidya–de Sitter Black Hole
Springer Science and Business Media LLC - Tập 41 - Trang 559-567 - 2002
S. Q. Wu, X. Cai
Hawking evaporation of photons in a Vaidya–de Sitter black hole is investigated by using the method of generalized tortoise coordinate transformation. Both the location and the temperature of the event horizon depend on the time. It is shown that Hawking radiation of photons exists only for the complex Maxwell scalar φ0 in the advanced Eddington–Finkelstein coordinate system. This asymmetry of Haw...... hiện toàn bộ
Thermal Entanglement of XXZ Heisenberg Chain under Rectangle Magnetic Field
Springer Science and Business Media LLC - Tập 46 - Trang 2437-2442 - 2007
Xin Yu Zhao, Ling Zhou
We study thermal entanglement of XXZ Heisenberg chain under rectangle magnetic field. Under this magnetic field B, the region of thermal entanglement in terms of B and temperature T can be extended. Moreover, one can improve threshold temperature, where entanglement vanish, just by increasing the strength of magnetic field. This effect is similar to that of the anisotropic coupling of spin in XY ...... hiện toàn bộ
Dissipative Systems and Objective Description: Quantum Brownian Motion as an Example
Springer Science and Business Media LLC - Tập 43 - Trang 1515-1525 - 2004
B. Vacchini
A structure of generator of a quantum dynamical semigroup for the dynamics of a test particle interacting through collisions with the environment is considered, which has been obtained from a microphysical model. The related master-equation is shown to go over to a Fokker–Planck equation for the description of Brownian motion at quantum level in the long wavelength limit. The structure of this Fok...... hiện toàn bộ
Quantum Algorithms Know in Advance 50% of the Solution They Will Find in the Future
Springer Science and Business Media LLC - Tập 48 - Trang 3383-3395 - 2009
Giuseppe Castagnoli
Quantum algorithms require less operations than classical algorithms. The exact reason of this has not been pinpointed until now. Our explanation is that quantum algorithms know in advance 50% of the solution of the problem they will find in the future. In fact they can be represented as the sum of all the possible histories of a respective “advanced information classical algorithm”. This algorith...... hiện toàn bộ
Finitary Čech-de Rham Cohomology
Springer Science and Business Media LLC - Tập 41 - Trang 1857-1902 - 2002
Anastasios Mallios, Ioannis Raptis
The present paper continues (Mallios & Raptis, International Journal of Theoretical Physics, 2001, 40, 1885) and studies the curved finitary spacetime sheaves of incidence algebras presented therein from a Čech cohomological perspective. In particular, we entertain the possibility of constructing a nontrivial de Rham complex on these finite dimensional algebra sheaves along the lines of the first ...... hiện toàn bộ
Local Discrimination of Orthogonal Product States with a Two-Qubit Maximally Entangled State
Springer Science and Business Media LLC - Tập 60 - Trang 1399-1415 - 2021
Tian-Qing Cao, Qiao-Ling Xin, Lu Zhao
Recently, Zhang et al. raised two classes of orthogonal product states which cannot be exactly discriminated by local operations and classical communication (LOCC) in the quantum system of (2k + 1) ⊗ 2l and (3k + i) ⊗ (3l + j) (Sci. Rep. 6, 28864, 2016). However, it remains a meaningful question that what entanglement resources are necessary and/or sufficient for this task to be possible with LOCC...... hiện toàn bộ
On the Electromagnetic Origin of Inertia and Inertial Mass
Springer Science and Business Media LLC - Tập 47 - Trang 2706-2715 - 2008
Alexandre A. Martins, Mario J. Pinheiro
We address the problem of inertial property of matter through analysis of the motion of an extended charged particle. Our approach is based on the continuity equation for momentum (Newton’s second law) taking due account of the vector potential and its convective derivative. We obtain a development in terms of retarded potentials allowing an intuitive physical interpretation of its main terms. The...... hiện toàn bộ
Spin Squeezing for Superpositions of Dicke States
Springer Science and Business Media LLC - Tập 53 - Trang 586-591 - 2013
Xiu-Xia Hu, Guo-Jin Hu
We investigate spin squeezing for superpositions of Dicke states. We derive the mean spin direction, the length of mean spin, the optimally squeezed angle and numerically calculate the spin squeezing parameter, which is determined by on the superposed coefficients and the relative phase. Approximate same superposed amplitude and the smaller relative phase lead to the larger the length of mean spin...... hiện toàn bộ
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