16,414 research outputs found
On the Decoupling of the Homogeneous and Inhomogeneous Parts in Inhomogeneous Quantum Groups
We show that, if there exists a realization of a Hopf algebra in a
-module algebra , then one can split their cross-product into the tensor
product algebra of itself with a subalgebra isomorphic to and commuting
with . This result applies in particular to the algebra underlying
inhomogeneous quantum groups like the Euclidean ones, which are obtained as
cross-products of the quantum Euclidean spaces with the quantum groups
of rotation of , for which it has no classical analog.Comment: Latex file, 27 pages. Final version to appear in J. Phys.
Exclusive diffractive resonance production in proton-proton collisions at high energies
A model for exclusive diffractive resonance production in proton-proton
collisions at high energies is presented. This model is able to predict double
differential distributions with respect to the mass and the transverse momentum
of the produced resonance in the mass region 5 GeV. The model is
based on convoluting the Pomeron distribution in the proton with the
Pomeron-Pomeron-meson total cross section. The Pomeron-Pomeron-meson cross
section is saturated by direct-channel contributions from the Pomeron as well
as from two different trajectories, accompanied by the isolated f
resonance dominating the GeV region. A slowly varying
background is taken into account.Comment: 11 pages, 14 figures. arXiv admin note: text overlap with
arXiv:1512.0497
Unidirectional Rotation Neurones in the Optomotor System of the Crab, Carcinus
1. Among the optomotor fibres to the eye muscles in Carcinus a class was found which responds to unidirectional fast rotations around various body axes. All had large signals and are therefore of large diameter.
2. In one set of these fibres which fires especially for rotations around the dorsoventral axis, it could be shown that discharges take place especially during accelerations and that, when a rotation in the null direction is suddenly stopped, a short discharge occurs. The fibres for other axes behave in a similar manner.
3. For rotations around the ventro-dorsal axis, but not for other directions, mediumsized fibres are present which, in contrast to the fast fibres, respond to visual stimulation, as well as to body rotations in darkness, thus combining the input properties of the unidirectional fast rotatory and the unidirectional purely optokinetic small fibres. Their sensitivity to visual input is for low rotation velocities, to body rotations is for high rotation velocities
Factors Regulating the Discharge Frequency in Optomotor Fibres Of Carcinus Maenas
The influence of the excited state of the animal on various motor neurone discharges and accompanying muscle action potentials was studied in the eyestalk of the crab, Carcinus maenas.
In most cases large increases in firing frequency could be obtained during such states. An exception is the tonic eye-withdrawal system in which an inhibitory effect is caused.
A pronounced difference in habituation to constant stimuli between spring and summer was found for the position fibres; in spring it was slow and in summer much quicker
Resonance production in Pomeron-Pomeron collisions at the LHC
A model for Pomeron-Pomeron total cross section in the resonance region
5 GeV is presented. This model is based on Regge poles from
the Pomeron and two different trajectories, and includes the isolated
f resonance in the region GeV. A slowly
varying background is included. The presented Pomeron-Pomeron cross section is
not directly measurable, but is an essential ingredient for calculating
exclusive resonance production at the LHC.Comment: Proceedings XXIV Int. Workshop on Deep-Inelastic Scattering and
Related Subjects (DIS16), DESY, 11-15 April 2016, 5 pages, 3 figure
Finite-size scaling and the deconfinement transition in gauge theories
We introduce a new method for determining the critical indices of the
deconfinement transition in gauge theories. The method is based on the finite
size scaling behavior of the expectation value of simple lattice operators,
such as the plaquette. We test the method for the case of SU(3) pure gauge
theory in (2+1) dimensions and obtain a precise determination of the critical
index , in agreement with the prediction of the Svetitsky-Yaffe
conjecture.Comment: 6 pages. Several comments and one reference added, results unchange
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