10,490 research outputs found
Mathematics of the Quantum Zeno Effect
We present an overview of the mathematics underlying the quantum Zeno effect.
Classical, functional analytic results are put into perspective and compared
with more recent ones. This yields some new insights into mathematical
preconditions entailing the Zeno paradox, in particular a simplified proof of
Misra's and Sudarshan's theorem. We empahsise the complex-analytic structures
associated to the issue of existence of the Zeno dynamics. On grounds of the
assembled material, we reason about possible future mathematical developments
pertaining to the Zeno paradox and its counterpart, the anti-Zeno paradox, both
of which seem to be close to complete characterisations.Comment: 32 pages, 1 figure, AMSLaTeX. In: Mathematical Physics Research at
the Leading Edge, Charles V. Benton ed. Nova Science Publishers, Hauppauge
NY, pp. 111-141, ISBN 1-59033-905-3, 2003; revision contains corrections from
the published corrigenda to Reference [64
Incentive Systems in Multi-Level Markets for Virtual Goods
As an alternative to rigid DRM measures, ways of marketing virtual goods
through multi-level or networked marketing have raised some interest. This
report is a first approach to multi-level markets for virtual goods from the
viewpoint of theoretical economy. A generic, kinematic model for the monetary
flow in multi-level markets, which quantitatively describes the incentives that
buyers receive through resales revenues, is devised. Building on it, the
competition of goods is examined in a dynamical, utility-theoretic model
enabling, in particular, a treatment of the free-rider problem. The most
important implications for the design of multi-level market mechanisms for
virtual goods, or multi-level incentive management systems, are outlined.Comment: 18 pages, 5 figures; graphics with reduced resolution. Full
resolution available on author's homepage. Accepted contribution to the
Workshop 'Virtual Goods' at the Conference AXMEDIS 2005, 30. November - 2.
December, Florence, Ital
Asymptotic Hyperfunctions, Tempered Hyperfunctions, and Asymptotic Expansions
We introduce new subclasses of Fourier hyperfunctions of mixed type,
satisfying polynomial growth conditions at infinity, and develop their sheaf
and duality theory. We use Fourier transformation and duality to examine
relations of these 'asymptotic' and 'tempered' hyperfunctions to known classes
of test functions and distributions, especially the Gelfand-Shilov-Spaces.
Further it is shown that the asymptotic hyperfunctions, which decay faster than
any negative power, are precisely the class that allow asymptotic expansions at
infinity. These asymptotic expansions are carried over to the
higher-dimensional case by applying the Radon transformation for
hyperfunctions.Comment: 31 pages, 1 figure, typos corrected, references adde
Authorised Translations of Electronic Documents
A concept is proposed to extend authorised translations of documents to
electronically signed, digital documents. Central element of the solution is an
electronic seal, embodied as an XML data structure, which attests to the
correctness of the translation and the authorisation of the translator. The
seal contains a digital signature binding together original and translated
document, thus enabling forensic inspection and therefore legal security in the
appropriation of the translation. Organisational aspects of possible
implementation variants of electronic authorised translations are discussed and
a realisation as a stand-alone web-service is presented.Comment: In: Peer-reviewed Proceedings of the Information Security South
Africa (ISSA) 2006 From Insight to Foresight Conference, 5 to 7 July 2006,
Sandton, South Afric
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