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1.
Two functionals
and
are introduced forC
*-dynamical systems with invariant states and stationary channels. It is shown that the Kolmogorov-Sinai-type theorems hold for these functionals
and
. Our functionals
and
are set within the framework of quantum information theory and generalize a quantum KS entropy by CNT and the mutual entropy by Ohya. 相似文献
2.
A. Bartl W. Majerotto B. Mösslacher N. Oshimo 《Zeitschrift fur Physik C Particles and Fields》1991,52(4):677-684
We present a detailed study of
and
and the subsequent decays of
,
, and
at the LHC
. We explore the relevant supersymmetry parameter range. We calculate the cross sections as well as the rates for interesting signatures such as the production of one or two leptons on the lepton side. 相似文献
3.
A gauge covariant formulation of the generating operator (-operator) theory for the Zakharov-Shabat system is proposed. The operator
, corresponding to the gauge equivalent system in the pole gauge is explicitly calculated. Thus the unified approach to the nonlinear Schrödinger-type equations based on is automatically reformulated with the help of
for the Heisenberg ferromagnet-type equations. Consequently, it is established that the conserved densities for the Heisenberg-ferromagnet-type equations are polynomial inS(x) and itsx-derivatives. Special attention is paid to the interrelation between the hierarchies of symplectic structures corresponding to the above mentioned families of gauge-equivalent equations. It is shown that the geometrical properties of the conjugated operator * are gaugeindependent. 相似文献
4.
A renormalization group method is used to construct approximants for the magnetization,m, and the static structure factor,
(q), for the simple cubic Ising model. Using the best values for the thermal critical index, the transition temperature, and the nearest-neighbor correlation function as input, we obtain recursion relations form and
(q) which lead to reasonable results over a wide range of temperatures and wave numbers. 相似文献
5.
R. Fantoni F. Bijnen N. Djurić S. Piccirillo 《Applied physics. B, Lasers and optics》1991,52(3):176-183
Coherent anti-Stokes Raman Scattering has been employed to investigate gas-phase reactions between SiH4 and small hydrocarbons leading to formation of SiC powder. SiC2 has been identified as reaction intermediate, due to the occurrence of resonance enhanced CARS coupling vibrational leavels in the ground
and first electronically excited
state. The rich structure observed in the range 4480 Å<AS<4650 Å is assigned to SiC2 taking into account the cyclic geometry of this species and revising former data on
electronic transitions.ENEA Guest 相似文献
6.
W. Bernreuther G. W. Botz O. Nachtmann P. Overmann 《Zeitschrift fur Physik C Particles and Fields》1991,52(4):567-573
We calculate CP-odd correlations inZ decays to leptons,
. These correlations are sensitive to the weak dipole moment
of the . With 107 producedZ particles and with observation of the decay channels
and v
we estimate that
can be determined with an accuracy of about
(1 s.d.). 相似文献
7.
We have examined the influence of parametric noise on the solution behavioru(t, x) of a nonlinear initial value() problem arising in cell kinetics. In terms of ensemble statistics, the eventual limiting solution mean
and variance
are well-characterized functions of the noise statistics, and
and
depend on . When noise is continuously present along the trajectory,
and
are independent of the noise statistics and . However, in their evolution toward
and
, both
u
(t, x) and
u
2
(t, x) depend on the noise and. 相似文献
8.
W. Drechsler 《Foundations of Physics》1989,19(12):1479-1497
To represent extension of objects in particle physics, a modified Weyl theory is used by gauging the curvature radius of the local fibers in a soldered bundle over space-time possessing a homogeneous space G/H of the (4, 1)-de Sitter group G as fiber. Objects with extension determined by a fundamental length parameter R0 appear as islands D(i) in space-time characterized by a geometry of the Cartan-Weyl type (i.e., involving torsion and modified Weyl degrees of freedom). Farther away from the domains D(i), space-time is identified with the pseudo-Riemannian space of general relativity. Extension and symmetry breaking are described by a set of additional fields (
, given as a section on an associated bundle
over space-time B with structural group
= G D(1), where D(1) is the dilation group. Field equations for the quantities defining the underlying bundle geometry and for the fields
are established involving matter source currents derived from a generalized spinor wave function. Einstein's equations for the metric are regarded as the part of the
-gauge theory related to the Lorentz subgroup H of G exhibiting thereby the broken nature of the
-symmetry for regions outside the domains D(i).Talk presented at the International Conference on Field Theory and General Relativity held at Utah State University, Logan, Utah, June 26–July 2, 1988. 相似文献
9.
S. L. Woronowicz 《Communications in Mathematical Physics》1972,28(3):221-235
Let
be aC*-algebra and
be an opposite algebra. Notions of exact andj-positive states of
are introduced. It is shown, that any factor state of
can be extended to a pure exactj-positive state
of
. The correspondence
generalizes the notion of the purifications map introduced by Powers and Størmer. The factor states 1 and 2 are quasi-equivalent if and only if their purifications
and
are equivalent. 相似文献
10.
Horng-Tzer Yau 《Communications in Mathematical Physics》1996,181(2):367-408
Let
denote the grand canonical Gibbs measure of a lattice gas in a cube of sizeL with the chemical potential and a fixed boundary condition. Let
be the corresponding canonical measure defined by conditioning
on
. Consider the lattice gas dynamics for which each particle performs random walk with rates depending on near-by particles. The rates are chosen such that, for everyn andL fixed,
is a reversible measure. Suppose that the Dobrushin-Shlosman mixing conditions holds for
forall chemical potentials . We prove that
for any probability densityf with respect to
; here the constant is independent ofn orL andD denotes the Dirichlet form of the dynamics. The dependence onL is optimal.Research partially supported by U.S. National Science Foundations grant 9403462, Sloan Foundation Fellowship and David and Lucile Packard Foundation Fellowship. 相似文献
11.
S. Doplicher R. V. Kadison D. Kastler Derek W. Robinson 《Communications in Mathematical Physics》1967,6(2):101-120
We study pairs {
, } for which
is aC*-algebra and is a homomorphism of a locally compact, non-compact groupG into the group of *-automorphisms of
. We examine, especially, those systems {
, } which are (weakly) asymptotically abelian with respect to their invariant states (i.e. |A
g
(B) —
g
(B)A 0 asg for those states such that (
g
(A)) = (A) for allg inG andA in
). For concrete systems (those with
-acting on a Hilbert space andg
g
implemented by a unitary representationg U
g
on this space) we prove, among other results, that the operators commuting with
and {U
g
} form a commuting family when there is a vector cyclic under
and invariant under {U
g
}. We characterize the extremal invariant states, in this case, in terms of weak clustering properties and also in terms of factor and irreducibility properties of {
,U
g
}. Specializing to amenable groups, we describe operator means arising from invariant group means; and we study systems which are asymptotically abelian in mean. Our interest in these structures resides in their appearance in the infinite system approach to quantum statistical mechanics. 相似文献
12.
Yu. I. Romanov 《Russian Physics Journal》1971,14(12):1628-1631
A scheme is discussed according to which the system of leptons is characterized by a single leptonic charge with different values for muonic leptons and electronic leptons. The weak neutrino-lepton interaction is investigated within the framework of this scheme. Charged (V + A)-currents are introduced to describe the
and
transitions.Translated from Izvestiya VUZ. Fizika, No. 12, pp. 30–34, December, 1971. 相似文献
13.
Models of random systems whose Hamiltonian reads
, where
and
i
,=1,...,n are independent, identically distributed random variables are discussed.J
ij
are assumed to be symmetric, with respect toJ
0, random variables and also symmetric functions of components of
. A question of dependence of a phase diagram on a probability distribution of
is addressed. A class of distributions and interactionsJ
ij
, which give rise to phase diagrams called typical is selected. Then a problem of obtaining typical phase diagrams, containing a certain region with an infinite number of pure phases, is studied. 相似文献
14.
We display three equivalent conditions for a sublattice, isomorphic to aP
, of the propositional systemP() of a quantum system to be the representation of a physical subsystem (see [1]). These conditions are valid for dim
3. We prove that one of them is still necessary and sufficient if dim
<3. A physical interpretation of this condition is given.Wetenschappelijke medewerkers bij het Interuniversitair Instituut voor Kernwetenschappen (in het kader van navorsingsprogramma 21 EN). 相似文献
15.
We report numerical data obtained on the special-purpose computer PERCOLA for the exponent
of the electrical conductivity of 2D percolation. The extrapolation yields
and a correction to the scaling exponent=1.2±0.2. 相似文献
16.
Pi-Tai Chou Chen-Pin Chang John H. Clements Kuo Meng-Shin 《Journal of fluorescence》1995,5(4):369-375
The synthesis and photophysics of 4-formyl-4-N,N-dimethylamino-1,1-biphenyl are reported. The emission spectrum in various solvent polarities demonstrates solvatochromism, indicating that the fluorescence originates from an electronically excited species with a strong charge transfer character. The change in
[
max(absorption) –
max(emission)] varies from 1500 cm–1 inn-heptane to as much as 7500 cm–1 in acetonitrile. In protic solvents, the unusual excitation energy-dependent steady-state emission (red edge effect), resulting from solvent dielectric relaxation, was observed in media with a low viscosity. The large Stokes-shifted and high-yield fluorescence led to the observation of the efficient lasing action. The frequency tunability of the laser output is strongly solvent dependent, generating a new charge transfer laser dye in the blue-green region. 相似文献
17.
The approach to isospectral Hamiltonian flow introduced in part I is further developed to include integration of flows with singular spectral curves. The flow on finite dimensional Ad*-invariant Poisson submanifolds of the dual
of the positive part of the loop algebra
is obtained through a generalization of the standard method of linearization on the Jacobi variety of the invariant spectral curveS. These curves are embedded in the total space of a line bundleTP
1(C), allowing an explicit analysis of singularities arising from the structure of the image of a moment map
from the space of rank-r deformations of a fixedN×N matrixA. It is shown how the linear flow of line bundles
over a suitably desingularized curve
may be used to determine both the flow of matricial polynomialsL() and the Hamiltonian flow in the spaceM
N,r×MN,r in terms of -functions. The resulting flows are proved to be completely integrable. The reductions to subalgebras developed in part I are shown to correspond to invariance of the spectral curves and line bundles
under certain linear or anti-linear involutions. The integration of two examples from part I is given to illustrate the method: the Rosochatius system, and the CNLS (coupled non-linear Schrödinger) equation.Research supported in part by the Natural Sciences and Engineering Research Council of Canada and by U.S. Army grant DAA L03-87-K-0110 相似文献
18.
R. N. Chaudhuri 《Czechoslovak Journal of Physics》1986,36(8):930-932
The Hill determinant method is discussed in the context ofq
confinement power potential of typeV(r)= – V
0–a/r + br, b > 0, which is commonly used for thec
andb
systems. The masses predicted by the potential are in good agreement with the experimental results.Presented at the symposium Mesons and Light Nuclei, Bechyn, Czechoslovakia May 27–June 1, 1985. 相似文献
19.
A. G. Lipnitskii A. V. Nikiforov V. M. Silkin E. V. Chulkov 《Russian Physics Journal》1991,34(10):888-893
The surface electronic band structure of the Pb (001) was calculated using the self-consistent, first-principles linear-augmented-plane-wave method and the norm-conserving pseudopotentiai method. In the nonrelativistic case, forbidden gaps appear above and below the Fermi levelin the bulk projected band structure of lead. An occupied surface state at the
point and two surface states in a wide forbidden gap above EF are found. A characteristic feature of the electronic structure of the Pb (001) surface is the absence of a surface state within the forbidden S-P gap in the vicinity of the
point. The inclusion of scalar-relativistic effects leads to the merger of several S-P gaps into one wide gap extending throughout the entire Brillouin zone. At the same time, the occupied state at point
extends to point
and its energy decreases by 2 eV. New, relatively weak surface states in the
direction and unoccupied states in the vicinity of the
point appear. An unoccupied surface state is found at the bottom of the forbidden gap at point
. Including the contribution of the spinorbit pseudopotentiai leads to the appearance of two-spin orbit gas; however, the surface level structure is practically unchanged (except for the disappearance of the unoccupied surface state of Pz-symmetry at point
).Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 47–53, October, 1991. 相似文献
20.
Jamil Daboul 《International Journal of Theoretical Physics》1974,11(3):145-147
It is proved that runaway solutions persist if Abraham's force –m
is generalised by adding to it afinite number of terms which are linear in higher derivatives of
. The implication of this result to Eliezer's relativistic generalisation of the Lorentz-Dirac equation is discussed.Worked supported by the Minerva Foundation. 相似文献