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  • 1
    Electronic Resource
    Electronic Resource
    Formation cross-sections of singlet and triplet excitons in π-conjugated polymers (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 409 (2001), S. 494-497 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Electroluminescence in organic light-emitting diodes arises from a charge-transfer reaction between the injected positive and negative charges by which they combine to form singlet excitons that subsequently decay radiatively. The quantum yield of this process (the number of photons ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35054025
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  • 2
    Electronic Resource
    Electronic Resource
    *-products on quantum spaces (2002)
    Springer
    The European physical journal 23 (2002), S. 761-767 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. In this paper we present explicit formulas for the *-product on quantum spaces which are of particular importance in physics, i.e., the q-deformed Minkowski space and the q-deformed Euclidean space in 3 and 4 dimensions, respectively. Our formulas are complete and formulated using the deformation parameter q. In addition, we worked out an expansion in powers of $h={\rm ln} q$ up to second order, for all considered cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100520200924
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Deformed field theory on $\kappa$ -spacetime (2003)
    Springer
    The European physical journal 31 (2003), S. 129-138 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. A general formalism is developed that allows the construction of a field theory on quantum spaces which are deformations of ordinary spacetime. The symmetry group of spacetime (the Poincaré group) is replaced by a quantum group. This formalism is demonstrated for the $\kappa$ -deformed Poincaré algebra and its quantum space. The algebraic setting is mapped to the algebra of functions of commuting variables with a suitable *-product. Fields are elements of this function algebra. The Dirac and Klein-Gordon equation are defined and an action is found from which they can be derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjc/s2003-01309-y
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  • 4
    Electronic Resource
    Electronic Resource
    Towards UV finite quantum field theoriesfrom non-local field operators (2004)
    Springer
    The European physical journal 35 (2004), S. 283-292 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. A non-local toy model whose interaction consists of smeared, non-local field operators is presented. We work out the Feynman rules and propose a power counting formula for arbitrary graphs. Explicit calculations for one loop graphs show that their contribution is finite for sufficient smearing and agree with the power counting formula. UV/IR mixing does not occur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjc/s2004-01783-7
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  • 5
    Electronic Resource
    Electronic Resource
    The standard model on non-commutative space-time (2002)
    Springer
    The European physical journal 23 (2002), S. 363-376 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We consider the standard model on a non-commutative space and expand the action in the non-commutativity parameter $\theta^{\mu \nu}$ . No new particles are introduced; the structure group is $SU(3)\times SU(2)\times U(1)$ . We derive the leading order action. At zeroth order the action coincides with the ordinary standard model. At leading order in $\theta^{\mu\nu}$ we find new vertices which are absent in the standard model on commutative space-time. The most striking features are couplings between quarks, gluons and electroweak bosons and many new vertices in the charged and neutral currents. We find that parity is violated in non-commutative QCD. The Higgs mechanism can be applied. QED is not deformed in the minimal version of the NCSM to the order considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100520100873
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