1,629 research outputs found
The fractional symmetric rigid rotor
Based on the Riemann fractional derivative the Casimir operators and
multipletts for the fractional extension of the rotation group SO(n) are
calculated algebraically. The spectrum of the corresponding fractional
symmetric rigid rotor is discussed. It is shown, that the rotational,
vibrational and -unstable limits of the standard geometric collective
models are particular limits of this spectrum. A comparison with the ground
state band spectra of nuclei shows an agreement with experimental data better
than 2%. The derived results indicate, that the fractional symmetric rigid
rotor is an appropriate tool for a description of low energy nuclear
excitations.Comment: pages 12, figures 7, accepted by J.Phys.
Properties of a fractional derivative Schroedinger type wave equation and a new interpretation of the charmonium spectrum
Based on the Caputo fractional derivative the classical, non relativistic
Hamiltonian is quantized leading to a fractional Schroedinger type wave
equation. The free particle solutions are localized in space. Solutions for the
infinite well potential and the radial symmetric ground state solution are
presented. It is shown, that the behaviour of these functions may be reproduced
with a ordinary Schroeodinger equation with an additional potential, which is
of the form V ~ x for , corresponding to the confinement potential,
introduced phenomenologically to the standard models for non relativistic
interpretation of quarkonium-spectra. The ordinary Schroedinger equation is
triple factorized and yields a fractional wave equation with internal SU(3)
symmetry. The twofold iterated version of this wave equation shows a direct
analogy to the fractional Schroedinger equation derived. The angular momentum
eigenvalues are calculated algebraically. The resulting mass formula is applied
to the charmonium spectrum and reproduces the experimental masses with an
accuracy better than 0.1%. Extending the standard charmonium spectrum, three
additional particles are predicted and associated with and
Y(4260) observed recently and one X(4965), not yet observed. The root mean
square radius for is calculated to be ~0.3[fm]. The
derived results indicate, that a fractional wave equation may be an appropriate
tool for a description of quark-like particles.Comment: 14 pages, 5 figure
Fractional spin - a property of particles described with a fractional Schroedinger equation
It is shown, that the requirement of invariance under spatial rotations
reveales an intrinsic fractional extended translation-rotation-like property
for particles described with the fractional Schroedinger equation, which we
call fractional spin.Comment: 5 page
Fractional phase transition in medium size metal clusters and some remarks on magic numbers in gravitationally and weakly interacting clusters
Based on the Riemann- and Caputo definition of the fractional derivative we
use the fractional extensions of the standard rotation group SO(3) to construct
a higher dimensional representation of a fractional rotation group with mixed
derivative types. An analytic extended symmetric rotor model is derived, which
correctly predicts the sequence of magic numbers in metal clusters. It is
demonstrated, that experimental data may be described assuming a sudden change
in the fractional derivative parameter which is interpreted as a
second order phase transition in the region of cluster size with .
Furthermore it is demonstrated, that the four different realizations of
higher dimensional fractional rotation groups may successfully be connected to
the four fundamental interaction types realized in nature and may be therefore
used for a prediction of magic numbers and binding energies of clusters with
gravitational force and weak force respectively bound constituents.
The results presented lead to the conclusion, that mixed fractional
derivative operators might play a key role for a successful unified theoretical
description of all four fundamental forces realized in nature.Comment: 20 pages, 5 figure
Towards a geometric interpretation of generalized fractional integrals - Erdelyi-Kober type integrals on as an example
A family of generalized Erdelyi-Kober type fractional integrals is
interpreted geometrically as a distortion of the rotationally invariant
integral kernel of the Riesz fractional integral in terms of generalized
Cassini ovaloids on . Based on this geometric view, several extensions are
discussed.Comment: 8 pages, 2 figure
Covariant fractional extension of the modified Laplace-operator used in 3D-shape recovery
Extending the Liouville-Caputo definition of a fractional derivative to a
nonlocal covariant generalization of arbitrary bound operators acting on
multidimensional Riemannian spaces an appropriate approach for the 3D shape
recovery of aperture afflicted 2D slide sequences is proposed. We demonstrate,
that the step from a local to a nonlocal algorithm yields an order of magnitude
in accuracy and by using the specific fractional approach an additional factor
2 in accuracy of the derived results.Comment: 5 pages, 3 figures, draft for proceedings IFAC FDA12 in Nanjing,
Chin
q-deformed Lie algebras and fractional calculus
Fractional calculus and q-deformed Lie algebras are closely related. Both
concepts expand the scope of standard Lie algebras to describe generalized
symmetries. For the fractional harmonic oscillator, the corresponding q-number
is derived. It is shown, that the resulting energy spectrum is an appropriate
tool e.g. to describe the ground state spectra of even-even nuclei. In
addition, the equivalence of rotational and vibrational spectra for fractional
q-deformed Lie algebras is shown and the values for the
fractional q-deformed symmetric rotor are calculated.Comment: 8 pages, 3 figure
Uniqueness of the fractional derivative definition
For the Riesz fractional derivative besides the well known integral
representation two new differential representations are presented, which
emphasize the local aspects of a fractional derivative. The consequences for a
valid solution of the fractional Schroedinger equation are discussed.Comment: 5 pages, section on manifest covariant representation on R^N adde
Generalization of the fractional Poisson distribution
A generalization of the Poisson distribution based on the generalized
Mittag-Leffler function is proposed and the raw
moments are calculated algebraically in terms of Bell polynomials. It is
demonstrated, that the proposed distribution function contains the standard
fractional Poisson distribution as a subset. A possible interpretation of the
additional parameter is suggested.Comment: 10 pages, 3 figure
The fractional Schr\"odinger equation and the infinite potential well - numerical results using the Riesz derivative
Based on the Riesz definition of the fractional derivative the fractional
Schr\"odinger equation with an infinite well potential is investigated. First
it is shown analytically, that the solutions of the free fractional
Schr\"odinger equation are not eigenfunctions, but good approximations for
large k and in the vicinity of \alpha=2. The first lowest eigenfunctions are
then calculated numerically and an approximate analytic formula for the level
spectrum is derived.Comment: revised version: eqs. (2.15)ff corrected, figures actualized,
arbitrary size of potential wel
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