340 research outputs found
Composite leptons and quarks constructed as triply occupied quasiparticles in quaternionic quanutm mechanics
\noindent We propose a set of rules for constructing composite leptons and
quarks as triply occupied quasiparticles, in the quaternionic quantum mechanics
of a pair of Harari-Shupe preons and . The composites fall into two
classes, those with totally antisymmetric internal wave functions, and those
with internal wave functions of mixed symmetry. The mixed symmetry states
consist of precisely the three spin 1/2 quark lepton families used in the
standard model (48 particle states, {\it not} counting the doubling arising
from antiparticles), plus one doublet of spin 3/2 quarks (24 particle states).
The antisymmetric states consist of a set of spin 3/2 leptonic states with
charges as in a standard model family (16 particle states), and a spin 1/2
leptonic fractionally charged doublet (4 particle states). We sketch ideas for
deriving our rules from a fundamental quaternionic preonic field theory.Comment: 10pages,plain tex, IASSNS-HEP-94/2
Pairing of Parafermions of Order 2: Seniority Model
As generalizations of the fermion seniority model, four multi-mode
Hamiltonians are considered to investigate some of the consequences of the
pairing of parafermions of order two. 2-particle and 4-particle states are
explicitly constructed for H_A = - G A^+ A with A^+}= 1/2 Sum c_{m}^+ c_{-m}^+
and the distinct H_C = - G C^+ C with C^+}= 1/2 Sum c_{-m}^+ c_{m}^+, and for
the time-reversal invariant H_(-)= -G (A^+ - C^+)(A-C) and H_(+) = -G
(A^+dagger + C^+)(A+C), which has no analogue in the fermion case. The spectra
and degeneracies are compared with those of the usual fermion seniority model.Comment: 18 pages, no figures, no macro
On Infinite Quon Statistics and "Ambiguous" Statistics
We critically examine a recent suggestion that "ambiguous" statistics is
equivalent to infinite quon statistics and that it describes a dilute,
nonrelativistics ideal gas of extremal black holes. We show that these two
types of statistics are different and that the description of extremal black
holes in terms of "ambiguous" statistics cannot be applied.Comment: Latex, 9 pages, no figures, to appear in Mod.Phys.Lett.
Using a discrete product model to determine the design element junctures
This paper describes a discrete model of a standard airframe part. The model is intended for determining the junctures between the design elements of a node (unit) in the pre-assembly procedures. We herein propose an algorithm selecting base surfaces for basing the product being assembled; selections are made on the basis of the 3D model of such product
On the Functional Integral Theory of Systems with Kinematical Interaction
We propose a systematic way to investigate the low-temperature thermodynamic
properties of quantum spin systems subject to the restriction that only a
finite number of bosons may occupy a single lattice site. Such a kinematical
interaction results in appearance of a temperature dependent chemical
potential. Its low-temperature asymptotics is calculated self-consistently
using the functional integration technique.Comment: 3 pages (REVTeX), 2 PS figure
Strong decays of radially excited mesons in a chiral approach
We study radial excitations of pseudoscalar and vector (q bar q) mesons
within a chiral approach. We derive a general form for a chiral Lagrangian
describing processes involving excited pseudoscalar and vector mesons. The
parameters of the chiral Lagrangian are fitted using data and previous
calculations in the framework of the 3P0 model. Finite-width effects are
examined and predictions for mesons previously not discussed are given.
Available experimental data is analyzed whenever possible. Possible hints for
exotic mesons and open interpretation-issues are discussed.Comment: 16 page
Partition function for general multi-level systems
We describe a unified approach to calculating the partition functions of a
general multi-level system with a free Hamiltonian. Particularly, we present
new results for parastatistical systems of any order in the second quantized
approach. Anyonic- like systems are briefly discussed.Comment: Latex file, 16 page
Gauge-Invariant Approach to Meson Photoproduction Including the Final-State Interaction
A gauge-invariant formalism is presented for the practical treatment of
photo- and electroproduction of pseudoscalar mesons off nucleons that allows an
explicit incorporation of hadronic final-state interactions. The
semi-phenomenological approach is based on a field theory developed by one of
the authors. It generalizes an earlier approach by allowing for systematic
improvement of approximations in a controlled manner. The practical feasibility
is illustrated by applying the lowest-order result to the photoproduction of
both neutral and charged pions.Comment: Plenary talk given at the N*2005 Workshop (Oct. 2005, Tallahassee,
FL); to appear in the Proceedings (to be publ. by WorldScientific
Forecasting stock market returns over multiple time horizons
In this paper we seek to demonstrate the predictability of stock market
returns and explain the nature of this return predictability. To this end, we
introduce investors with different investment horizons into the news-driven,
analytic, agent-based market model developed in Gusev et al. (2015). This
heterogeneous framework enables us to capture dynamics at multiple timescales,
expanding the model's applications and improving precision. We study the
heterogeneous model theoretically and empirically to highlight essential
mechanisms underlying certain market behaviors, such as transitions between
bull- and bear markets and the self-similar behavior of price changes. Most
importantly, we apply this model to show that the stock market is nearly
efficient on intraday timescales, adjusting quickly to incoming news, but
becomes inefficient on longer timescales, where news may have a long-lasting
nonlinear impact on dynamics, attributable to a feedback mechanism acting over
these horizons. Then, using the model, we design algorithmic strategies that
utilize news flow, quantified and measured, as the only input to trade on
market return forecasts over multiple horizons, from days to months. The
backtested results suggest that the return is predictable to the extent that
successful trading strategies can be constructed to harness this
predictability.Comment: This is the version accepted for publication in a journal
Quantitative Finance. A draft was posted here on 18 August 2015. 50 page
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