共查询到20条相似文献,搜索用时 62 毫秒
1.
The coordinate change eigenvalues for the MacKay and van Zeijts period doubling renormalisation operator for bimodal 1 D maps are derived. They are found in numerical computations of the spectrum at all the periodic orbits of renormalisation of period up to five. 相似文献
2.
Martin S. Altschul 《Foundations of Physics》1978,8(1-2):69-92
We discuss the criteria for deriving new information from coordinate transformations, focusing on the property of implementability, or measurability in practice. We contrast the role of coordinate transformations in classical and quantum physics, and demonstrate that many well-known applications fail to meet the criteria for new information. Finally, we discuss some mathematical properties of the coordinate transformations, and then relate these properties to a practical measurement scheme. 相似文献
3.
We present a convenient approach to finding multi-partite entangled state with continuum variables, which is the common eigenvectors of center-of-mass coordinate and mass-weighted relative momenta, by decomposing the normally ordered Gaussian-form operator expressing the completeness relation which is constructed by analyzing the eigenvector equations. The whole derivation is based on the technique of integration within an ordered product of operators. 相似文献
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5.
Xiao-Gang Lan 《International Journal of Theoretical Physics》2012,51(4):1195-1203
The Hawking effect of Dirac particles in a non-stationary Kerr-Newman black hole is investigated using an improved Damour-Ruffini
method with a new tortoise coordinate transformation. In contrast with the old tortoise coordinate, the new one satisfies
the dimensional requirement. It is interesting to note that the Hawking emission spectrum remains a blackbody one with a correction
term ξ existing in the Hawking temperature. Compared with the old tortoise coordinate transformation, our results appears more accurate
and reliable. 相似文献
6.
S. J. Cyvin 《光谱学快报》2013,46(9):489-492
A new internal coordinate, referred to as Keating's bending, is defined in terms of the familiar R vectors. 相似文献
7.
John L. Johnson 《Foundations of Physics》1996,26(11):1529-1557
A four-dimensional operator is shown to contain the operator-generators for rotation, scale, reflections, and boosts. The hypothesis is advanced that a physical system changes under this operator by at most a complex phase factor due to invariance against the choice of menial frame. A canonical transform gives a simple relation between space-time and energy-momentum. The basic conserved quantity is a four-dimensional angular momentum and/or coupling constant. The differential of this function contains a second-order differential product which is constrained as a power series in the independent variable. The analysis explores the consequences of the model and shows its degree of correspondence to the standard models. 相似文献
8.
Zhong-Wen Feng Juan Deng Guo-Ping Li Shu-Zheng Yang 《International Journal of Theoretical Physics》2012,51(10):3214-3221
In this paper, the quantum tunneling of the non-stationary Kerr-Newman black hole is investigated via Hamilton-Jacobi equation and two types of general tortoise coordinate transformations. The tunneling rates, the Hawking temperatures and radiation spectrums are derived respectively. Our result shows that the new type of general tortoise coordinate transformation is more reasonable. 相似文献
9.
M. A. Ganjali 《International Journal of Theoretical Physics》2012,51(8):2380-2391
In this paper, we study the field dynamics in Tortoise coordinate where the equation of motion of a scalar can be written as Schrodinger-like form. We obtain a general form for effective potential by finding the Schrodinger equation for scalar and spinor fields and study its global behavior in some black hole backgrounds in three dimension such as BTZ black holes, new type black holes and black holes with no horizon. 相似文献
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11.
The velocity variable of a noise oscillator as an internal or
external noise is proposed, the spectrum of which is quite
different from that of the coordinate variable of the same noise
oscillator. The former leads to ballistic diffusion for a free
particle in long time limit and the asymptotical results of the
system are sensitive to the initial condition. However, diffusion
process induced by the coordinate of noise oscillator is a normal
one and depends on the initial condition only in the transient
time. This allows us to classify two kinds of non-Markovian
processes: normal one and strong one, just like the processes
induced by the coordinate and the velocity of noise oscillator,
respectively. Applying to a correlation ratchet, we have found
that the steady current of a particle subjected to the velocity of
noise oscillator is opposite to that subjected to its coordinate,
thus the former shows greenness and the latter redness. 相似文献
12.
D. C. Salisbury 《Foundations of Physics》1998,28(9):1425-1431
Classical generators of one-dimensional reparametrization, and higher dimensional diffeomorphism symmetries are displayed for the relativistic free particle, relativistic particles in interaction, and general relativity in both Lagrangian and Hamiltonian frameworks. Projectability of these symmetries under the Legendre map is achieved only with dynamical variable-dependent transformations. When gauge symmetries are included, as in Einstein-Yang-Mills and a new reparametrization covariant pre-Maxwell model, pure coordinate symmetries are not projectable. They must be accompanied by internal gauge transformations. 相似文献
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14.
The general formalism of time-dependent canonical transformations is applied to the case of coordinate transformations in classical and quantum mechanics. 相似文献
15.
FANHong-Yi 《理论物理通讯》2004,42(3):339-342
By virtue of the technique of integration within an ordered product of operators and the fundamental operator identity Hn(X)=2^n : X^n :, where X is the coordinate operator and Hn is the n-order Hermite polynomials,: : is the normal ordering symbol, we not only simplify the derivation of the main properties of Hermitc polynomials, but also directly derive some new operator identities regarding to Hn(X). Operation for transforming f(X) → : f(X) :is also discussed. 相似文献
16.
Problems with automated techniques for measuring boundary fractal dimensions using structured walks are described and a new method is proposed, coordinate averaging. The actual polygon generated by a structured walk is variable and depends upon the chosen starting point. This noise is apparent in the resulting Richardson plots. The use of multiple starting points enhances the Fast (equipaced) method but is less productive with the Hybrid (fixed step) method because the paths followed around the perimeter tend to converge. Coordinate averaging uses perimeters that have been mapped as a list of sequential coordinates. They are then examined by averaging every coordinate with an increasing number of neighbours. The resulting family of shapes progressively shed detail and can be used to generate fractal dimensions. Coordinate averaging appears to be free from the noise found with structured walks and is able to examine highly convoluted shapes. In addition it appears well suited to the examination of the homogeneity of boundaries and can follow the detailed evolution of individual features. 相似文献
17.
Xin-Qin Gao Li-E Qiang Jian-Yang Zhu Zheng Zhao 《General Relativity and Gravitation》2004,36(11):2511-2523
By reducing the Klein-Gordon equation near the event horizon with a new tortoise coordinate transformation, we calculate the Hawking temperature of the arbitrarily accelerating Kinnersley black hole. The temperature is a little different from what we have when we select the usual tortoise coordinate transformation. Then by means of the thin film model, we obtain the Bekenstein Hawking entropy of the Kinnersley black hole, which is proportional to the area of its event horizon with the same cut-off relation as the static case. 相似文献
18.
After a new tortoise coordinate transformation is adopted, the entropy and non-thermal radiation of an arbitrarily accelerating charged black hole are discussed as an example of non-stationary black holes. The same cut-off relation is chosen as static case, which is independent of space-time, and then the entropy of the non-stationary black hole is also proportional to the area of its event horizon. Meanwhile, the crossing of the particle energy levels near the event horizon is studied, the representative of the maximum value of the crossing energy levels is the same as the usual tortoise coordinate transformation. 相似文献
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20.
色坐标对白光LED光通量的影响 总被引:6,自引:1,他引:5
研究了在蓝光芯片加黄色荧光粉制备白光LED方法中,色坐标位置对光通量的影响。在同样蓝光功率条件下,我们对标准白光点(色坐标x=0.33±0.05,y=0.33±0.05)附近不同色坐标位置的光通量进行了计算。假设(0.325,0.332)位置流明效率为100 lm/W,计算得出,最大光通量对应的色坐标位置为(0.35,0.38),光通量为112 lm;最小光通量对应的色坐标位置为(0.29,0.28),光通量为93.5 lm。相对于100 lm的变化幅度达到18.5%。通过与实验数据的对比和分析,进一步验证了白光LED光通量随色坐标增大而增加的这一趋势。 相似文献