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I consider two cases where QCD string is described by an effective theory of long strings: the static potential and meson scattering amplitudes in the Regge regime. I show how they can be solved in the mean-field approximation, justified by the large number of space–time dimensions, and argue that it turns out to be exact. I compare contributions from QCD string and perturbative QCD and discuss experimental consequences for the scattering amplitudes. 相似文献
65.
The AdS/CFT correspondence may give a new way of understanding field theories in extreme conditions, as in the quark–gluon plasma phase of quark matter. The correspondence normally involves asymptotically AdS black holes with dual field theories which are defined on locally flat boundary spacetimes; the implicit assumption is that the distortions of spacetime which occur under extreme conditions do not affect the field theory in any unexpected way. However, AdS black holes are [to varying degrees] fragile, in the sense that they become unstable to stringy effects when their event horizons are sufficiently distorted. This implies that field theories on curved backgrounds may likewise be unstable in a suitable sense. We investigate this phenomenon, focussing on the “fragility” of AdS5 black holes with flat event horizons. We find that, when they are distorted, these black holes are always unstable in string theory. This may have consequences for the detailed structure of the quark matter phase diagram at extreme values of the spacetime curvature. 相似文献
66.
The consensus string problem for a metric is NP-complete 总被引:1,自引:0,他引:1
Given a set S of strings, a consensus string of S based on consensus error is a string w that minimizes the sum of the distances between w and all the strings in S. In this paper, we show that the problem of finding a consensus string based on consensus error is NP-complete when the penalty matrix is a metric. 相似文献
67.
We prove the existence and uniqueness of a global solution of a damped quasilineat hyperbolic equatiion. We apply a method based on a special integral inequality, to show that the solution decays exponentially, and to obtain precise estimates of the constants in estimates. 相似文献
68.
S. S. Shahid-Zadeh Mousavi 《International Journal of Theoretical Physics》2009,48(7):2068-2071
We assume that the total target phase space is non-commutative. This leads to the generalization of the oscillator-algebra
of the string, and the corresponding Virasoso algebra. The effects of this non-commutativity on some string states will be
studied. 相似文献
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Robert Ehrlich 《Physics in Perspective (PIP)》2006,8(1):83-89
I compare the theory of intelligent design to string theory to see on what basis, if any, only the former can be justifiably
excluded as being scientific.We shall see that the classic criterion of testability or falsifiability is sometimes not so
straightforward, and that there are other criteria to help us make such a distinction. 相似文献