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排序方式: 共有266条查询结果,搜索用时 15 毫秒
61.
Hrvoje Nikolić 《Foundations of Physics Letters》2006,19(3):259-267
It is often argued that superluminal velocities and nontrivial space-time topologies, allowed by the theory of relativity,
may lead to causal paradoxes. By emphasizing that the notion of causality assumes the existence of a time arrow (TA) that
points from the past to the future, the apparent paradoxes appear to be an artefact of the wrong tacit assumption that the
relativistic coordinate TA coincides with the physical TA. The latter should be identified with the thermodynamic TA, which,
by being absolute and irrotational, does not lead to paradoxes. 相似文献
62.
63.
In this paper we argue that a firewall is simply a manifestation of an inconsistent truncation of non‐perturbative effects that unitarize the semiclassical black hole. Namely, we show that a naive truncation of quantum corrections to the Hawking spectrum at order , inexorably leads to a “localised” divergent energy density near the black hole horizon. Nevertheless, in the same approximation, a distant observer only sees a discretised spectrum and concludes that unitarity is achieved by effects. This is due to the fact that instead, the correct quantum corrections to the Hawking spectrum go like . Therefore, while at a distance far away from the horizon, where , quantum corrections are perturbative, they do diverge close to the horizon, where . Nevertheless, these “corrections” nicely re‐sum so that correlations functions are smooth at the would‐be black hole horizon. Thus, we conclude that the appearance of firewalls is just a signal of the breaking of the semiclassical approximation at the Page time, even for large black holes. 相似文献
64.
Tomislav Ivezić 《Foundations of Physics》2006,36(10):1511-1534
In this paper we present definitions of different four-dimensional (4D) geometric quantities (Clifford multivectors). New decompositions of the torque N and the angular momentum M (bivectors) into 1-vectors Ns, Nt and Ms, Mt, respectively, are given. The torques Ns, Nt (the angular momentums Ms, Mt), taken together, contain the same physical information as the bivector N (the bivector M). The usual approaches that deal with the 3D quantities
etc. and their transformations are objected from the viewpoint of the invariant special relativity (ISR). In the ISR, it is considered that 4D geometric quantities are well-defined both theoretically and experimentally in the 4D spacetime. This is not the case with the usual 3D quantities. It is shown that there is no apparent electrodynamic paradox with the torque, and that the principle of relativity is naturally satisfied, when the 4D geometric quantities are used instead of the 3D quantities. 相似文献
65.
To handle the ubiquitous problem of “dependence learning,” copulas are quickly becoming a pervasive tool across a wide range of data‐driven disciplines encompassing neuroscience, finance, econometrics, genomics, social science, machine learning, healthcare, and many more. At the same time, despite their practical value, the empirical methods of “learning copula from data” have been unsystematic with full of case‐specific recipes. Taking inspiration from modern LP‐nonparametrics, this paper presents a modest contribution to the need for a more unified and structured approach of copula modeling that is simultaneously valid for arbitrary combinations of continuous and discrete variables. 相似文献
66.
Quantum Tunneling of Massive Particles from a Garfinkle-Horowitz-Strominger Dilatonic Black Hole 总被引:1,自引:0,他引:1
GAO Li LIU Wen-Biao 《理论物理通讯》2006,46(4):766-768
Hawking radiation is viewed as a process of quantum tunneling. The massive particles' tunneling from Garfinkle-I-Iorowitz-Strominger black hole is investigated. Using Jingyi Zhang's de Broglie wave method, we get the unthermal spectrum, and the result is consistent with the underlying unitary theory. 相似文献
67.
Jarosław Pykacz 《Foundations of Physics》2006,36(3):437-442
Negative probabilities were several times proposed in the literature as a way to reconcile violation of Bell-type inequalities with the premise of local realism. It is argued that instead of using negative probabilities that have no physical meaning one can use for this purpose fuzzy probabilities that have sound and unambiguous interpretation. 相似文献
68.
本文在分析了目前有关线性规划“悖论”的论述后,运用灵敏度分析的方法和影子价格的理论,对所谓线性规划的悖论问题作了新的解释,提出了“悖论””不悖、其实是在情理之中的新观点。并对悖论产生的条件提出了简便易行的计算公式。 相似文献
69.
M. A. Jafarizadeh G. Najarbashi Y. Akbari H. Habibian 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2008,47(2):233-255
One of the problems concerning entanglement witnesses (EWs) is the
construction of them by a given set of operators. Here several
multi-qubit EWs called stabilizer EWs are constructed by using the
stabilizer operators of some given multi-qubit states such as GHZ,
cluster and exceptional states. The general approach to manipulate
the multi-qubit stabilizer EWs by exact(approximate) linear
programming (LP) method is described and it is shown that the
Clifford group play a crucial role in finding the hyper-planes
encircling the feasible region. The optimality, decomposability and
non-decomposability of constructed stabilizer EWs are discussed. 相似文献