105,342 research outputs found
Morphisms from P2 to Gr(2,C4)
In this note we study morphisms from P2 to Gr(2,C4) from the point of view of
the cohomology class they represent in the Grassmannian. This leads to some new
result about projection of d-uple imbedding of P2 to P5
Evolution of the superposition of displaced number states with the two-atom multiphoton Jaynes-Cummings model: interference and entanglement
In this paper we study the evolution of the two two-level atoms interacting
with a single-mode quantized radiation field, namely, two-atom multiphoton
Jaynes-Cummings model when the radiation field and atoms are initially prepared
in the superpostion of displaced number states and excited atomic states,
respectively. For this system we investigate the atomic inversion, Wigner
function, phase distribution and entanglement.Comment: 18 pages, 17 figure
Strong D* -> D+pi and B* -> B+pi couplings
We compute g_{D* D pi} and g_{B* B pi} using a framework in which all
elements are constrained by Dyson-Schwinger equation studies of QCD, and
therefore incorporates a consistent, direct and simultaneous description of
light- and heavy-quarks and the states they may constitute. We link these
couplings with the heavy-light-meson leptonic decay constants, and thereby
obtain g_{D* D pi}=15.9+2.1/-1.0 and g_{B* B pi}=30.0+3.2/-1.4. From the latter
we infer \hat-g_B=0.37+0.04/-0.02. A comparison between g_{D* D pi} and g_{B* B
pi} indicates that when the c-quark is a system's heaviest constituent,
Lambda_{QCD}/m_c-corrections are not under good control.Comment: 5 pages, 1 table, 2 figure
Reexamination of scaling in the five-dimensional Ising model
In three dimensions, or more generally, below the upper critical dimension,
scaling laws for critical phenomena seem well understood, for both infinite and
for finite systems. Above the upper critical dimension of four, finite-size
scaling is more difficult.
Chen and Dohm predicted deviation in the universality of the Binder cumulants
for three dimensions and more for the Ising model. This deviation occurs if the
critical point T = Tc is approached along lines of constant A = L*L*(T-Tc)/Tc,
then different exponents a function of system size L are found depending on
whether this constant A is taken as positive, zero, or negative. This effect
was confirmed by Monte Carlo simulations with Glauber and Creutz kinetics.
Because of the importance of this effect and the unclear situation in the
analogous percolation problem, we here reexamine the five-dimensional Glauber
kinetics.Comment: 8 pages including 5 figure
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